Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).
The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).
The hollow, muscular organ that maintains the circulation of the blood.
Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.
Surgery performed on the heart.
Unexpected rapid natural death due to cardiovascular collapse within one hour of initial symptoms. It is usually caused by the worsening of existing heart diseases. The sudden onset of symptoms, such as CHEST PAIN and CARDIAC ARRHYTHMIAS, particularly VENTRICULAR TACHYCARDIA, can lead to the loss of consciousness and cardiac arrest followed by biological death. (from Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 7th ed., 2005)
Enlargement of the HEART, usually indicated by a cardiothoracic ratio above 0.50. Heart enlargement may involve the right, the left, or both HEART VENTRICLES or HEART ATRIA. Cardiomegaly is a nonspecific symptom seen in patients with chronic systolic heart failure (HEART FAILURE) or several forms of CARDIOMYOPATHIES.
Compression of the heart by accumulated fluid (PERICARDIAL EFFUSION) or blood (HEMOPERICARDIUM) in the PERICARDIUM surrounding the heart. The affected cardiac functions and CARDIAC OUTPUT can range from minimal to total hemodynamic collapse.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
Pathological conditions involving the HEART including its structural and functional abnormalities.
The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow.
Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.
Contractile activity of the MYOCARDIUM.
Cessation of heart beat or MYOCARDIAL CONTRACTION. If it is treated within a few minutes, heart arrest can be reversed in most cases to normal cardiac rhythm and effective circulation.
The lower right and left chambers of the heart. The right ventricle pumps venous BLOOD into the LUNGS and the left ventricle pumps oxygenated blood into the systemic arterial circulation.
Precursor cells destined to differentiate into cardiac myocytes (MYOCYTES, CARDIAC).
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
A group of diseases in which the dominant feature is the involvement of the CARDIAC MUSCLE itself. Cardiomyopathies are classified according to their predominant pathophysiological features (DILATED CARDIOMYOPATHY; HYPERTROPHIC CARDIOMYOPATHY; RESTRICTIVE CARDIOMYOPATHY) or their etiological/pathological factors (CARDIOMYOPATHY, ALCOHOLIC; ENDOCARDIAL FIBROELASTOSIS).
Myosin type II isoforms found in cardiac muscle.
Visualization of the heart structure and cardiac blood flow for diagnostic evaluation or to guide cardiac procedures via techniques including ENDOSCOPY (cardiac endoscopy, sometimes refered to as cardioscopy), RADIONUCLIDE IMAGING; MAGNETIC RESONANCE IMAGING; TOMOGRAPHY; or ULTRASONOGRAPHY.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
Cyclopentanophenanthrenes with a 5- or 6-membered lactone ring attached at the 17-position and SUGARS attached at the 3-position. Plants they come from have long been used in congestive heart failure. They increase the force of cardiac contraction without significantly affecting other parameters, but are very toxic at larger doses. Their mechanism of action usually involves inhibition of the NA(+)-K(+)-EXCHANGING ATPASE and they are often used in cell biological studies for that purpose.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.
A state of subnormal or depressed cardiac output at rest or during stress. It is a characteristic of CARDIOVASCULAR DISEASES, including congenital, valvular, rheumatic, hypertensive, coronary, and cardiomyopathic. The serious form of low cardiac output is characterized by marked reduction in STROKE VOLUME, and systemic vasoconstriction resulting in cold, pale, and sometimes cyanotic extremities.
Occurrence of heart arrest in an individual when there is no immediate access to medical personnel or equipment.
Elements of limited time intervals, contributing to particular results or situations.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
The volume of the HEART, usually relating to the volume of BLOOD contained within it at various periods of the cardiac cycle. The amount of blood ejected from a ventricle at each beat is STROKE VOLUME.
The geometric and structural changes that the HEART VENTRICLES undergo, usually following MYOCARDIAL INFARCTION. It comprises expansion of the infarct and dilatation of the healthy ventricle segments. While most prevalent in the left ventricle, it can also occur in the right ventricle.
The transference of a heart from one human or animal to another.
One of the three polypeptide chains that make up the TROPONIN complex. It inhibits F-actin-myosin interactions.
The hemodynamic and electrophysiological action of the left HEART VENTRICLE. Its measurement is an important aspect of the clinical evaluation of patients with heart disease to determine the effects of the disease on cardiac performance.
Developmental abnormalities involving structures of the heart. These defects are present at birth but may be discovered later in life.
The amount of BLOOD pumped out of the HEART per beat, not to be confused with cardiac output (volume/time). It is calculated as the difference between the end-diastolic volume and the end-systolic volume.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing.
Examinations used to diagnose and treat heart conditions.
One of the three polypeptide chains that make up the TROPONIN complex. It is a cardiac-specific protein that binds to TROPOMYOSIN. It is released from damaged or injured heart muscle cells (MYOCYTES, CARDIAC). Defects in the gene encoding troponin T result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.
An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.
The artificial substitution of heart and lung action as indicated for HEART ARREST resulting from electric shock, DROWNING, respiratory arrest, or other causes. The two major components of cardiopulmonary resuscitation are artificial ventilation (RESPIRATION, ARTIFICIAL) and closed-chest CARDIAC MASSAGE.
Tumors in any part of the heart. They include primary cardiac tumors and metastatic tumors to the heart. Their interference with normal cardiac functions can cause a wide variety of symptoms including HEART FAILURE; CARDIAC ARRHYTHMIAS; or EMBOLISM.
Institutions specializing in the care of patients with heart disorders.
The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)
A form of CARDIAC MUSCLE disease that is characterized by ventricular dilation, VENTRICULAR DYSFUNCTION, and HEART FAILURE. Risk factors include SMOKING; ALCOHOL DRINKING; HYPERTENSION; INFECTION; PREGNANCY; and mutations in the LMNA gene encoding LAMIN TYPE A, a NUCLEAR LAMINA protein.
A condition in which the LEFT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE; MYOCARDIAL INFARCTION; and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the left ventricular wall.
Agents that have a strengthening effect on the heart or that can increase cardiac output. They may be CARDIAC GLYCOSIDES; SYMPATHOMIMETICS; or other drugs. They are used after MYOCARDIAL INFARCT; CARDIAC SURGICAL PROCEDURES; in SHOCK; or in congestive heart failure (HEART FAILURE).
A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (CORONARY ARTERY DISEASE), to obstruction by a thrombus (CORONARY THROMBOSIS), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (MYOCARDIAL INFARCTION).
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.
Theoretical representations that simulate the behavior or activity of the cardiovascular system, processes, or phenomena; includes the use of mathematical equations, computers and other electronic equipment.
Any pathological condition where fibrous connective tissue invades any organ, usually as a consequence of inflammation or other injury.
A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.
The heart of the fetus of any viviparous animal. It refers to the heart in the postembryonic period and is differentiated from the embryonic heart (HEART/embryology) only on the basis of time.
A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.
The chambers of the heart, to which the BLOOD returns from the circulation.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
The hemodynamic and electrophysiological action of the HEART VENTRICLES.
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.
General or unspecified injuries to the heart.
Diversion of the flow of blood from the entrance of the right atrium directly to the aorta (or femoral artery) via an oxygenator thus bypassing both the heart and lungs.
One of the minor protein components of skeletal muscle. Its function is to serve as the calcium-binding component in the troponin-tropomyosin B-actin-myosin complex by conferring calcium sensitivity to the cross-linked actin and myosin filaments.
Enlargement of the LEFT VENTRICLE of the heart. This increase in ventricular mass is attributed to sustained abnormal pressure or volume loads and is a contributor to cardiovascular morbidity and mortality.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
Inflammatory processes of the muscular walls of the heart (MYOCARDIUM) which result in injury to the cardiac muscle cells (MYOCYTES, CARDIAC). Manifestations range from subclinical to sudden death (DEATH, SUDDEN). Myocarditis in association with cardiac dysfunction is classified as inflammatory CARDIOMYOPATHY usually caused by INFECTION, autoimmune diseases, or responses to toxic substances. Myocarditis is also a common cause of DILATED CARDIOMYOPATHY and other cardiomyopathies.
Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN.
Isopropyl analog of EPINEPHRINE; beta-sympathomimetic that acts on the heart, bronchi, skeletal muscle, alimentary tract, etc. It is used mainly as bronchodilator and heart stimulant.
The repeating contractile units of the MYOFIBRIL, delimited by Z bands along its length.
A potent natriuretic and vasodilatory peptide or mixture of different-sized low molecular weight PEPTIDES derived from a common precursor and secreted mainly by the HEART ATRIUM. All these peptides share a sequence of about 20 AMINO ACIDS.
The protein constituents of muscle, the major ones being ACTINS and MYOSINS. More than a dozen accessory proteins exist including TROPONIN; TROPOMYOSIN; and DYSTROPHIN.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.
The mitochondria of the myocardium.
Flaps of tissue that prevent regurgitation of BLOOD from the HEART VENTRICLES to the HEART ATRIA or from the PULMONARY ARTERIES or AORTA to the ventricles.
A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.
A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).
Abnormal fluid retention by the body due to impaired cardiac function or heart failure. It is usually characterized by increase in venous and capillary pressure, and swollen legs when standing. It is different from the generalized edema caused by renal dysfunction (NEPHROTIC SYNDROME).
Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.
A type of imaging technique used primarily in the field of cardiology. By coordinating the fast gradient-echo MRI sequence with retrospective ECG-gating, numerous short time frames evenly spaced in the cardiac cycle are produced. These images are laced together in a cinematic display so that wall motion of the ventricles, valve motion, and blood flow patterns in the heart and great vessels can be visualized.
Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.
A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in HEART VENTRICLES. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (SYNCOPE). It is one of the major electrocardiographic patterns seen with CARDIAC ARREST.
Refers to animals in the period of time just after birth.
The circulation of blood through the CORONARY VESSELS of the HEART.
A PEPTIDE that is secreted by the BRAIN and the HEART ATRIA, stored mainly in cardiac ventricular MYOCARDIUM. It can cause NATRIURESIS; DIURESIS; VASODILATION; and inhibits secretion of RENIN and ALDOSTERONE. It improves heart function. It contains 32 AMINO ACIDS.
Damage to the MYOCARDIUM resulting from MYOCARDIAL REPERFUSION (restoration of blood flow to ischemic areas of the HEART.) Reperfusion takes place when there is spontaneous thrombolysis, THROMBOLYTIC THERAPY, collateral flow from other coronary vascular beds, or reversal of vasospasm.
A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).
Strains of mice in which certain GENES of their GENOMES have been disrupted, or "knocked-out". To produce knockouts, using RECOMBINANT DNA technology, the normal DNA sequence of the gene being studied is altered to prevent synthesis of a normal gene product. Cloned cells in which this DNA alteration is successful are then injected into mouse EMBRYOS to produce chimeric mice. The chimeric mice are then bred to yield a strain in which all the cells of the mouse contain the disrupted gene. Knockout mice are used as EXPERIMENTAL ANIMAL MODELS for diseases (DISEASE MODELS, ANIMAL) and to clarify the functions of the genes.
The pressure within a CARDIAC VENTRICLE. Ventricular pressure waveforms can be measured in the beating heart by catheterization or estimated using imaging techniques (e.g., DOPPLER ECHOCARDIOGRAPHY). The information is useful in evaluating the function of the MYOCARDIUM; CARDIAC VALVES; and PERICARDIUM, particularly with simultaneous measurement of other (e.g., aortic or atrial) pressures.
The qualitative or quantitative estimation of the likelihood of adverse effects that may result from exposure to specified health hazards or from the absence of beneficial influences. (Last, Dictionary of Epidemiology, 1988)
Surgical therapy of ischemic coronary artery disease achieved by grafting a section of saphenous vein, internal mammary artery, or other substitute between the aorta and the obstructed coronary artery distal to the obstructive lesion.
The excitable plasma membrane of a muscle cell. (Glick, Glossary of Biochemistry and Molecular Biology, 1990)
The larger subunits of MYOSINS. The heavy chains have a molecular weight of about 230 kDa and each heavy chain is usually associated with a dissimilar pair of MYOSIN LIGHT CHAINS. The heavy chains possess actin-binding and ATPase activity.
The veins and arteries of the HEART.
The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway.
Measurement of blood flow based on induction at one point of the circulation of a known change in the intravascular heat content of flowing blood and detection of the resultant change in temperature at a point downstream.
Post-systolic relaxation of the HEART, especially the HEART VENTRICLES.
Measurement of intracardiac blood flow using an M-mode and/or two-dimensional (2-D) echocardiogram while simultaneously recording the spectrum of the audible Doppler signal (e.g., velocity, direction, amplitude, intensity, timing) reflected from the moving column of red blood cells.
A GATA transcription factor that is expressed in the MYOCARDIUM of developing heart and has been implicated in the differentiation of CARDIAC MYOCYTES. GATA4 is activated by PHOSPHORYLATION and regulates transcription of cardiac-specific genes.
A condition in which HEART VENTRICLES exhibit impaired function.
A surgical specialty concerned with diagnosis and treatment of disorders of the heart, lungs, and esophagus. Two major types of thoracic surgery are classified as pulmonary and cardiovascular.
Period of contraction of the HEART, especially of the HEART VENTRICLES.
Fluid accumulation within the PERICARDIUM. Serous effusions are associated with pericardial diseases. Hemopericardium is associated with trauma. Lipid-containing effusion (chylopericardium) results from leakage of THORACIC DUCT. Severe cases can lead to CARDIAC TAMPONADE.
A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of CARDIOMYOCYTES. Defects in the SCN5A gene, which codes for the alpha subunit of this sodium channel, are associated with a variety of CARDIAC DISEASES that result from loss of sodium channel function.
The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.
A condition characterized by the thickening of the ventricular ENDOCARDIUM and subendocardium (MYOCARDIUM), seen mostly in children and young adults in the TROPICAL CLIMATE. The fibrous tissue extends from the apex toward and often involves the HEART VALVES causing restrictive blood flow into the respective ventricles (CARDIOMYOPATHY, RESTRICTIVE).
A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.
Drugs that bind to but do not activate beta-adrenergic receptors thereby blocking the actions of beta-adrenergic agonists. Adrenergic beta-antagonists are used for treatment of hypertension, cardiac arrhythmias, angina pectoris, glaucoma, migraine headaches, and anxiety.
RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.
Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.
The ENTERIC NERVOUS SYSTEM; PARASYMPATHETIC NERVOUS SYSTEM; and SYMPATHETIC NERVOUS SYSTEM taken together. Generally speaking, the autonomic nervous system regulates the internal environment during both peaceful activity and physical or emotional stress. Autonomic activity is controlled and integrated by the CENTRAL NERVOUS SYSTEM, especially the HYPOTHALAMUS and the SOLITARY NUCLEUS, which receive information relayed from VISCERAL AFFERENTS.
Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.
An imbalance between myocardial functional requirements and the capacity of the CORONARY VESSELS to supply sufficient blood flow. It is a form of MYOCARDIAL ISCHEMIA (insufficient blood supply to the heart muscle) caused by a decreased capacity of the coronary vessels.
A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.
A transferase that catalyzes formation of PHOSPHOCREATINE from ATP + CREATINE. The reaction stores ATP energy as phosphocreatine. Three cytoplasmic ISOENZYMES have been identified in human tissues: the MM type from SKELETAL MUSCLE, the MB type from myocardial tissue and the BB type from nervous tissue as well as a mitochondrial isoenzyme. Macro-creatine kinase refers to creatine kinase complexed with other serum proteins.
Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.
The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.
The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
Mature contractile cells, commonly known as myocytes, that form one of three kinds of muscle. The three types of muscle cells are skeletal (MUSCLE FIBERS, SKELETAL), cardiac (MYOCYTES, CARDIAC), and smooth (MYOCYTES, SMOOTH MUSCLE). They are derived from embryonic (precursor) muscle cells called MYOBLASTS.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
The long cylindrical contractile organelles of STRIATED MUSCLE cells composed of ACTIN FILAMENTS; MYOSIN filaments; and other proteins organized in arrays of repeating units called SARCOMERES .
Calcium-transporting ATPases that catalyze the active transport of CALCIUM into the SARCOPLASMIC RETICULUM vesicles from the CYTOPLASM. They are primarily found in MUSCLE CELLS and play a role in the relaxation of MUSCLES.
The restoration to life or consciousness of one apparently dead. (Dorland, 27th ed)
The innermost layer of the heart, comprised of endothelial cells.
Drugs that selectively bind to and activate beta-adrenergic receptors.
One of the three polypeptide chains that make up the TROPONIN complex of skeletal muscle. It is a calcium-binding protein.
The 10th cranial nerve. The vagus is a mixed nerve which contains somatic afferents (from skin in back of the ear and the external auditory meatus), visceral afferents (from the pharynx, larynx, thorax, and abdomen), parasympathetic efferents (to the thorax and abdomen), and efferents to striated muscle (of the larynx and pharynx).
Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.
Isoforms of MYOSIN TYPE II, specifically found in the ventricular muscle of the HEART. Defects in the genes encoding ventricular myosins result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.
One of two major pharmacologically defined classes of adrenergic receptors. The beta adrenergic receptors play an important role in regulating CARDIAC MUSCLE contraction, SMOOTH MUSCLE relaxation, and GLYCOGENOLYSIS.
Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes.
The measurement of an organ in volume, mass, or heaviness.
Irreversible cessation of all bodily functions, manifested by absence of spontaneous breathing and total loss of cardiovascular and cerebral functions.
Types of artificial pacemakers with implantable leads to be placed at multiple intracardial sites. They are used to treat various cardiac conduction disturbances which interfere with the timing of contraction of the ventricles. They may or may not include defibrillating electrodes (IMPLANTABLE DEFIBRILLATORS) as well.
A tetrameric calcium release channel in the SARCOPLASMIC RETICULUM membrane of SMOOTH MUSCLE CELLS, acting oppositely to SARCOPLASMIC RETICULUM CALCIUM-TRANSPORTING ATPASES. It is important in skeletal and cardiac excitation-contraction coupling and studied by using RYANODINE. Abnormalities are implicated in CARDIAC ARRHYTHMIAS and MUSCULAR DISEASES.
The use of sophisticated methods and equipment to treat cardiopulmonary arrest. Advanced Cardiac Life Support (ACLS) includes the use of specialized equipment to maintain the airway, early defibrillation and pharmacological therapy.
A benign neoplasm derived from connective tissue, consisting chiefly of polyhedral and stellate cells that are loosely embedded in a soft mucoid matrix, thereby resembling primitive mesenchymal tissue. It occurs frequently intramuscularly where it may be mistaken for a sarcoma. It appears also in the jaws and the skin. (From Stedman, 25th ed)
Conical muscular projections from the walls of the cardiac ventricles, attached to the cusps of the atrioventricular valves by the chordae tendineae.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
An octapeptide that is a potent but labile vasoconstrictor. It is produced from angiotensin I after the removal of two amino acids at the C-terminal by ANGIOTENSIN CONVERTING ENZYME. The amino acid in position 5 varies in different species. To block VASOCONSTRICTION and HYPERTENSION effect of angiotensin II, patients are often treated with ACE INHIBITORS or with ANGIOTENSIN II TYPE 1 RECEPTOR BLOCKERS.
The relationship between the dose of an administered drug and the response of the organism to the drug.
Long-lasting voltage-gated CALCIUM CHANNELS found in both excitable and nonexcitable tissue. They are responsible for normal myocardial and vascular smooth muscle contractility. Five subunits (alpha-1, alpha-2, beta, gamma, and delta) make up the L-type channel. The alpha-1 subunit is the binding site for calcium-based antagonists. Dihydropyridine-based calcium antagonists are used as markers for these binding sites.
An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation).
Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.
A guanidine analog with specific affinity for tissues of the sympathetic nervous system and related tumors. The radiolabeled forms are used as antineoplastic agents and radioactive imaging agents. (Merck Index, 12th ed) MIBG serves as a neuron-blocking agent which has a strong affinity for, and retention in, the adrenal medulla and also inhibits ADP-ribosyltransferase.
Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.
Pathological conditions involving any of the various HEART VALVES and the associated structures (PAPILLARY MUSCLES and CHORDAE TENDINEAE).
Ion channels that specifically allow the passage of SODIUM ions. A variety of specific sodium channel subtypes are involved in serving specialized functions such as neuronal signaling, CARDIAC MUSCLE contraction, and KIDNEY function.
The HEART and the BLOOD VESSELS by which BLOOD is pumped and circulated through the body.
An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)
Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation.
A diverse superfamily of proteins that function as translocating proteins. They share the common characteristics of being able to bind ACTINS and hydrolyze MgATP. Myosins generally consist of heavy chains which are involved in locomotion, and light chains which are involved in regulation. Within the structure of myosin heavy chain are three domains: the head, the neck and the tail. The head region of the heavy chain contains the actin binding domain and MgATPase domain which provides energy for locomotion. The neck region is involved in binding the light-chains. The tail region provides the anchoring point that maintains the position of the heavy chain. The superfamily of myosins is organized into structural classes based upon the type and arrangement of the subunits they contain.
Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.
Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic.
An electrogenic ion exchange protein that maintains a steady level of calcium by removing an amount of calcium equal to that which enters the cells. It is widely distributed in most excitable membranes, including the brain and heart.
Cardiac electrical stimulators that apply brief high-voltage electroshocks to the HEART. These stimulators are used to restore normal rhythm and contractile function in hearts of patients who are experiencing VENTRICULAR FIBRILLATION or ventricular tachycardia (TACHYCARDIA, VENTRICULAR) that is not accompanied by a palpable PULSE. Some defibrillators may also be used to correct certain noncritical dysrhythmias (called synchronized defibrillation or CARDIOVERSION), using relatively low-level discharges synchronized to the patient's ECG waveform. (UMDNS, 2003)
Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
The study of the heart, its physiology, and its functions.
Services specifically designed, staffed, and equipped for the emergency care of patients.
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.
Non-human animals, selected because of specific characteristics, for use in experimental research, teaching, or testing.
Rhythmic compression of the heart by pressure applied manually over the sternum (closed heart massage) or directly to the heart through an opening in the chest wall (open heart massage). It is done to reinstate and maintain circulation. (Dorland, 28th ed)
Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.
Method in which prolonged electrocardiographic recordings are made on a portable tape recorder (Holter-type system) or solid-state device ("real-time" system), while the patient undergoes normal daily activities. It is useful in the diagnosis and management of intermittent cardiac arrhythmias and transient myocardial ischemia.
Proteins to which calcium ions are bound. They can act as transport proteins, regulator proteins, or activator proteins. They typically contain EF HAND MOTIFS.
The phenotypic manifestation of a gene or genes by the processes of GENETIC TRANSCRIPTION and GENETIC TRANSLATION.
A benign tumor derived from striated muscle. It is extremely rare, generally occurring in the tongue, neck muscles, larynx, uvula, nasal cavity, axilla, vulva, and heart. These tumors are treated by simple excision. (Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1354)
Treatment process involving the injection of fluid into an organ or tissue.
A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. It is used principally to calculate stroke volume and cardiac volume, but it is also related to myocardial contractility, thoracic fluid content, and circulation to the extremities.
The abrupt cessation of all vital bodily functions, manifested by the permanent loss of total cerebral, respiratory, and cardiovascular functions.
Agents that affect the rate or intensity of cardiac contraction, blood vessel diameter, or blood volume.
The introduction of a phosphoryl group into a compound through the formation of an ester bond between the compound and a phosphorus moiety.
The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment.
The movement of the BLOOD as it is pumped through the CARDIOVASCULAR SYSTEM.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
A subtype of striated muscle, attached by TENDONS to the SKELETON. Skeletal muscles are innervated and their movement can be consciously controlled. They are also called voluntary muscles.
The proportion of survivors in a group, e.g., of patients, studied and followed over a period, or the proportion of persons in a specified group alive at the beginning of a time interval who survive to the end of the interval. It is often studied using life table methods.
The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.
A catecholamine derivative with specificity for BETA-1 ADRENERGIC RECEPTORS. It is commonly used as a cardiotonic agent after CARDIAC SURGERY and during DOBUTAMINE STRESS ECHOCARDIOGRAPHY.
The period following a surgical operation.
The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).
Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules.
Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.
Diabetes complications in which VENTRICULAR REMODELING in the absence of CORONARY ATHEROSCLEROSIS and hypertension results in cardiac dysfunctions, typically LEFT VENTRICULAR DYSFUNCTION. The changes also result in myocardial hypertrophy, myocardial necrosis and fibrosis, and collagen deposition due to impaired glucose tolerance.
A state of elevated cardiac output due to conditions of either increased hemodynamic demand or reduced cardiac oxygen output. These conditions may include ANEMIA; ARTERIOVENOUS FISTULA; THYROTOXICOSIS; PREGNANCY; EXERCISE; FEVER; and ANOXIA. In time, compensatory changes of the heart can lead to pathological form of high cardiac output and eventual HEART FAILURE.
Abnormally rapid heartbeat, usually with a HEART RATE above 100 beats per minute for adults. Tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.
Cell membrane glycoproteins that are selectively permeable to potassium ions. At least eight major groups of K channels exist and they are made up of dozens of different subunits.
Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.
A procedure to stop the contraction of MYOCARDIUM during HEART SURGERY. It is usually achieved with the use of chemicals (CARDIOPLEGIC SOLUTIONS) or cold temperature (such as chilled perfusate).
An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.
Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.

Initial results of cardiac imaging at 7 Tesla. (1/150)

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Three-dimensional, in vivo MRI with self-gating and image coregistration in the mouse. (2/150)

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Motion of the cerebellar tonsils in the foramen magnum during the cardiac cycle. (3/150)

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Multiscale deformable registration for dual-energy x-ray imaging. (4/150)

Dual-energy (DE) imaging of the chest improves the conspicuity of subtle lung nodules through the removal of overlying anatomical noise. Recent work has shown double-shot DE imaging (i.e., successive acquisition of low- and high-energy projections) to provide detective quantum efficiency, spectral separation (and therefore contrast), and radiation dose superior to single-shot DE imaging configurations (e.g., with a CR cassette). However, the temporal separation between high-energy (HE) and low-energy (LE) image acquisition can result in motion artifacts in the DE images, reducing image quality and diminishing diagnostic performance. This has motivated the development of a deformable registration technique that aligns the HE image onto the LE image before DE decomposition. The algorithm reported here operates in multiple passes at progressively smaller scales and increasing resolution. The first pass addresses large-scale motion by means of mutual information optimization, while successive passes (2-4) correct misregistration at finer scales by means of normalized cross correlation. Evaluation of registration performance in 129 patients imaged using an experimental DE imaging prototype demonstrated a statistically significant improvement in image alignment. Specific to the cardiac region, the registration algorithm was found to outperform a simple cardiac-gating system designed to trigger both HE and LE exposures during diastole. Modulation transfer function (MTF) analysis reveals additional advantages in DE image quality in terms of noise reduction and edge enhancement. This algorithm could offer an important tool in enhancing DE image quality and potentially improving diagnostic performance.  (+info)

Whole-chest 64-MDCT of emergency department patients with nonspecific chest pain: Radiation dose and coronary artery image quality with prospective ECG triggering versus retrospective ECG gating. (5/150)

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Optical flow estimation for a periodic image sequence. (6/150)

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High spatial and temporal resolution cardiac cine MRI from retrospective reconstruction of data acquired in real time using motion correction and resorting. (7/150)

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Intrinsic gating for small-animal computed tomography: a robust ECG-less paradigm for deriving cardiac phase information and functional imaging. (8/150)

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CT technology continues to rapidly evolve, especially in the area of reducing radiation dose while preserving IQ. In the present study, we used a high-pitch, ECG-triggered scan mode on a second-generation DSCT scanner to assess PV and LA anatomy in patients with SR or AF. Our results show that PV imaging can be performed with a low median radiation dose of 1.4 mSv and achieves good to excellent CT IQ. CT scanning is feasible, with no difference in IQ between patients in AF compared with SR, without the need for heart rate-lowering agents. When compared with prior standard CT protocols, we observed a remarkable reduction in radiation dose for both patients with SR and AF with this high-pitch CT protocol. Scan time acquisition was much faster with this low radiation CT scanning technique compared with MRI, with excellent agreement of PV anatomy between the 2 imaging modalities.. Thorough assessment of PV and LA anatomy with a noninvasive imaging modality, such as CT, is important in patients with ...
PURPOSE: To describe prospective ECG-triggered dual-source CT dual-step pulsing (pECG(dual_step)) for evaluation of coronary arteries and cardiac function. METHODS: Fifty-one consecutive patients pre- or post-cardiovascular surgery were examined with adaptive sequential tube current modulated (pECG(dual-step)) 128-slice dual-source CT without heart rate control (main padding window: 40% RR interval ,65 bpm/70% RR interval ,65 bpm). Image quality of coronary arteries was graded (4-point scale), and cardiac function was evaluated. RESULTS: Mean HR was 68 bpm. Thirty-seven patients were in stable sinus rhythm (SR); 14 had arrhythmia. Image quality of coronary arteries was diagnostic in 804/816 (98%) of segments. The number of non-diagnostic segments was higher in patients with arrhythmia as compared to those in SR (4% vs. 0.5%; p = 0.01), and there were fewer segments with excellent image quality (79% vs. 94%; p , 0.001) and more segments with impaired image quality (p , 0.001 and p = 0.002). ...
Initial experience in patients evaluated for CAD shows that spiral MDCT studies may provide LV functional data in good correlation to Cine MRI.
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Cardiac CT clinics in Krong Preah Sihanouk at the best price. Find doctors, specialized in Cardiology and compare prices, costs and reviews.
OBJECTIVE: The purpose of this study was to prospectively evaluate the average heart rate and heart rate variability required for diagnostic imaging of the coronary arteries with high-pitch dual-source CT angiography of the thoracic and thoracoabdominal aorta. SUBJECTS AND METHODS: One hundred consecutively registered patients (82 men, 18 women; mean age, 68 +/- 13 years) underwent clinically indicated CT angiography of the thoracic (n = 33) and thoracoabdominal (n = 67) aorta with a dual-source 128-MDCT scanner in ECG-synchronized high-pitch (pitch, 3.2) data acquisition mode. No beta-blockers were administered. The image quality of the coronary arteries was graded on a 3-point scale by two independent blinded readers. The average heart rate and heart rate variability before data acquisition were noted. Effective radiation doses were calculated. RESULTS: Interobserver agreement on grade of image quality for the 1,414 coronary segments evaluated by both observers was good (kappa = 0.68). ...
Wolf-Parkinson-White (WPW) is one of the few clinical diseases that is mainly diagnosed by the electrocardiogram. One of the ultimate goals of modern medicine is to find a method to prevent disease. One of the best examples is catheter ablation of the Accessory Tracts in patients with WPW that will prevent tachyarrhythmias and Sudden Cardiac Death (SCD) in more than 95% of the patients. In patients with WPW, catheter ablation is the treatment of choice in the highly symptomatic patient with severe arrhythmias. A major challenge today is to ascertain the benefits versus the risks of doing catheter ablation in the asymptomatic patient with WPW. In this issue of Circulation, Obeyesekere et al1 using meta-analysis studied the risk of arrhythmia and sudden death in patients with asymptomatic pre-excitation and summarized the breadth of published evidence regarding the risks and benefits of catheter ablation in the asymptomatic patient. This study is an important milestone in the history of WPW, since ...
BACKGROUND: Positron emission tomography scanners with retractable septa allow both 3-dimensional (3D) and 2-dimensional (2D) acquisition modes. The study aim was to directly compare 2D and 3D acquisition modes for the evaluation of absolute myocardial blood flow (MBF) over a wide range of flow values. METHODS AND RESULTS: Instrumentation was used in 4 dogs to reduce the left circumflex artery lumen by greater than 75%. During infusion of adenosine, MBF was measured with both 2D and 3D dynamic acquisition and both oxygen 15 water and nitrogen 13 ammonia. Injected activities were 333 MBq and 111 MBq for 2D acquisition and 3D acquisition, respectively. Data were reconstructed by analytic methods, and MBF was assessed by use of an 18-segment model. MBF values ranged from 0.4 to 5.8 mL x g(-1) x min(-1) with O-15 water and from 0.3 to 3.9 mL x g(-1) x min(-1) with N-13 ammonia. No significant differences were observed in absolute MBF values obtained with the 2 acquisition modes, regardless of the ...
Korn, A.; Fenchel, M.; Bender, B.; Danz, S.; Thomas, C.; Ketelsen, D.; Claussen, C. D.; Moonis, G.; Krauss, B.; Heuschmid, M.; Ernemann, U.; Brodoefel, H. ...
March 4, 2011 -- VIENNA - Nearly one in five coronary CT angiography scans acquired with an emerging high-pitch dual-source CT angiography (DSCTA) protocol needs to be repeated. But the low-dose acquisitions possible mean even repeated scans have lower overall doses than comparable 64-detector-row CTA scans, researchers reported at the European Congress of Radiology. Discuss ...
Read Cardiac CT by Marc Dewey with Rakuten Kobo. Cardiac computed tomography (CT) has become a highly accurate diagnostic modality that continues to attract increasing a...
Cardiac Imaging - Viewing requires Macromedia Flash plug-in. Cardiac CT STR 6001 Cardiac CT: Anatomy and Anatomic Pitfalls (2006)Lynn S. Broderick, MD STR 6002 Cardiac CT: Principles and Techniques (2006)Benoit Desjardins, MD STR ...
RADAR is a simple acquisition mode that acquires both MRM and full scan MS simultaneously, a unique capability that can both simplify and accelerate development of robust methods.
Background - Autograft regurgitation and root dilatation after the Ross procedure is of major concern. We reviewed data from the German Ross Registry to document the development of autograft regurgitation and root dilatation with time and also to compare 2 different techniques of autograft implantation. Methods and Results - Between 1990 and 2006 1014 patients (786 men, 228 women; mean age 41.2 +/- 15.3 years) underwent the Ross procedure using 2 different implantation techniques (subcoronary, n = 521; root replacement, n = 493). Clinical and serial echocardiographic follow up was performed preoperatively and thereafter annually (mean follow up 4.41 +/- 3.11 years, median 3.93 years, range 0 to 16.04 years; 5012 patient- years). For statistical analysis of serial echocardiograms, a hierarchical multilevel modeling technique was applied. Eight early and 28 late deaths were observed. Pulmonary autograft reoperations were required in 35 patients. Initial autograft regurgitation grade was 0.49 (root ...
All studies involving use of ionizing radiation should be performed in accordance with the ALARA (As Low As Reasonably Achievable) principle, especially in children. In this study, the prospective ECG triggering technique with low voltage was used in dual-source computed tomography (DSCT) angiography to investigate if image quality with low radiation dose could be satisfactory in pediatric patients with congenital heart disease. Sixty pediatric patients with suspected congenital cardiovascular anomalies were enrolled prospectively in the study. They were randomly assigned to two groups for DSCT angiography. Group A were scanned by prospective ECG-triggering computed tomography angiography (CTA) with 80 kV tube voltage, while group B by used non-ECG-gated CTA with the same tube voltage. The anomaly accuracy was evaluated based on the surgical and/or conventional cardiac angiography findings. The overall image quality was assessed on a five-point scale. And the diagnostic accuracy and radiation dose was
This entire month, all the posts will discuss our way of performing high quality cardiac CT scans, on our 64-slice Siemens Sensation 64 CT scanner, starting from patient preparation, right upto reporting. Though weve had some hiccups on the way,...
This entire month, all the posts will discuss our way of performing high quality cardiac CT scans, on our 64-slice Siemens Sensation 64 CT scanner, starting from patient preparation, right upto reporting. Though weve had some hiccups on the way,...
Sydney Adventist Hospital is a modern acute care facility with all diagnostic and therapeutic services. The San offers a wide range of specialties including cardiac care, maternity and more.
BACKGROUND: Patients with treated HIV infection have clear survival benefits although with increased cardiac morbidity and mortality. Mechanisms of heart disease may be partly related to untreated chronic inflammation. Cardiovascular magnetic resonance imaging allows a comprehensive assessment of myocardial structure, function, and tissue characterization. We investigated, using cardiovascular magnetic resonance, subclinical inflammation and myocardial disease in asymptomatic HIV-infected individuals. METHODS AND RESULTS: Myocardial structure and function were assessed using cardiovascular magnetic resonance at 1.5-T in treated HIV-infected individuals without known cardiovascular disease (n=103; mean age, 45±10 years) compared with healthy controls (n=92; mean age, 44±10 years). Assessments included left ventricular volumes, ejection fraction, strain, regional systolic, diastolic function, native T1 mapping, edema, and gadolinium enhancement. Compared with controls, subjects with HIV infection had 6%
A 72 year old man attended for follow up computed tomography (CT) of a chronic type A aortic dissection, three years on from his original presentation. The contrast enhanced multislice CT was acquired using retrospective ECG gating. Subsequent reconstruction of the CT images was from a diastolic reconstruction window centred at 75% of the RR interval. This mode of acquisition provided images of the thoracic aorta free of motion artefact. The chronic dissection flap could clearly be seen arising in the proximal, aneurysmal ascending aorta (panel A, axial CT section), extending to the head and neck vessels (panel B, sagittal CT section), and progressing distally to the descending aorta (panel C, three dimensional reconstruction in sagittal section). Advanced post-processing using volume rendering techniques demonstrated the dissection (panel C) and the aneurysm (panel D) in three dimension.. Aortic motion artefact is the most common cause of false positive detection of dissection of the ...
Aims To estimate the life attributable risk (LAR) of cancer incidence over a wide range of dose radiation exposure and a large spectrum of possible diagnostic computed tomographic coronary angiography (CTCA) scenarios.. Methods This study included 561 consecutive patients who underwent a successful prospective ECG-gating CTCA protocol (low-dose group) 64-slice CTCA and 188 patients who underwent retrospective ECG-gating CTCA with ECG-triggered dose modulation CTCA (high-dose group). LAR was computed, given the organ equivalent dose, for all cancers in both sexes. LAR was tabulated for each decile of dose-length product by 10-year age classes, separately for each sex.. Results Estimates of LAR of any cancer for an exposure at age ≤40 year were lower in males than in females for any given quantile. At age ≥50years, LAR was similar between sexes only at the lowest exposure doses, whereas at higher dosage, it was, in general, higher for women. At the median age of this case series (62 years) and ...
SCENARIA will change the general trend of CT.. In order to fully answer the needs of the patient, the operator and the doctor, image quality, workflow and user-friendliness have been refined. Hitachi aims for an all-round CT with absolutely no room for compromise. 64ch/128slice CT SCENARIA is reborn.. 0.35s/rot, which can be used for not only the heart but also for any regions of the whole body such as the abdomen and the lower extremities, and the CORE method, which reduces various artifacts at high-pitch scanning, these features achieve both high-speed scanning and high image quality.. High-speed view rate. In order to secure sufficient data density in the periphery area even for scanning of the maximum FOV size, not only the heart but also all regions can be scanned at 0.35s/rot. This is realized by high-speed view rate of max.2,880 views/s data collection system developed exclusively for SCENARIA.. ...
Sydney Adventist Hospital is a modern acute care facility with all diagnostic and therapeutic services. The San offers a wide range of specialties including cardiac care, maternity and more.
Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
Steady-state free precession (SSFP) is a highly-efficient MRI pulse sequence that has been a fairly recent arrival in the functional MRI realm. Several methods for using balanced SSFP to detect the BOLD signal have been proposed to date and will be discussed in this review. After a brief introduction to the general properties of SSFP, this review describes the quite different approaches of transition-band and pass-band SSFP in terms of functional contrast mechanism. It then discusses the potential advantages of these techniques, followed by their challenges and shortcomings. Finally, it gives an overview of some applications considered to date and the authors perspective on where these techniques are headed. In the spirit of this special issue, the author also includes some of the personal history underlying her own explorations in this area. © 2011 Elsevier Inc.
The ideal cardiac scan length could be matched by the adaptive collimation in every case while the mean scanned length was longer by 15.4% with the 64 × 0.6 mm and by 27.2% with the fixed 96 × 0.6-mm collimation. While the DLP was almost identical between the adaptive and the 64 × 0.6-mm collimation (83 vs. 89 mGycm at 120 kV), it was 62.7% higher with the 96 × 0.6-mm collimation (135 mGycm), p , 0.001.. ...
TY - JOUR. T1 - Flow-weighted MRI of the lungs with the ECG-gated half-fourier FSE technique. T2 - Evaluation of the effect of the cardiac cycle. AU - Kawanami, Satoshi. AU - Nakamura, Katsumi. AU - Miyazaki, Mitsue. AU - Sugiura, Satoshi. AU - Yamamoto, Shuichiro. AU - Nakata, Hajime. PY - 2002/12/1. Y1 - 2002/12/1. N2 - We investigated temporal MR signal changes in the peripheral lung and proximal pulmonary vessels during the entire cardiac cycle in order to evaluate the characteristics of the diastolic-systolic subtraction method in the lung. In eight healthy volunteers free of lung diseases, changes in the MR signal during one breath-hold were investigated with the multiple ECG-triggered half-Fourier single-shot fast-spin echo (SS-FSE) technique. The signal intensity-time course curve in the lung showed that biphasic signals decreased 20% to 47% at systole and 5% to 33% at mid-diastole, measured against the maximum signals at late diastole. This signal decrease in the peripheral lung was ...
Cardiac CT - radiation doses, dose management and practical issues. L 11. Answer True or False. Patient dose from a cardiac CT is equivalent to 20 chest conventional radiographies. In cardiac CT the radiation dose to the different organs is very similar to the catheterization procedures....
The fetal electrocardiogram signal (FECG) is a major tool in monitoring and diagnosis of the fetus high risk conditions and arrhythmias. This paper introduces an accurate mathematical model for fetal electrocardiogram based on a real template FECG signal. This is done after elimination of maternal electrocardiogram (MECG) signal interference measured during pregnancy. The parameters of the introduced model are optimized in terms of sum square error using a genetic algorithm (GA). Our precise fetal electrocardiogram model can be a benchmark for other prospective researches particularly in FECG extraction. ©2007 IEEE.. ...
To evaluate free-breathing Navigator-triggered 3-D T1-weighted MRI (NAV-LAVA) compared to breath-hold (BH)-LAVA among cystic and solid renal masses.With an IRB waiver, 44 patients with 105 renal masses (71 non-enhancing cysts and 14 cystic and 20 solid renal masses) underwent MRI between 2016 and 2017 where BH-LAVA and NAV-LAVA were performed.
By Stephen E. Hale Jr., Ph.D.. Radiation dose from Computed Tomography (CT) exams has recently become a hot topic among the medical community, the legal community, and the public in general. Overdoses from brain perfusion studies at several medical facilities in California and Alabama have contributed to this rise in concern. But what can a CT technologist or radiologist actually tell their patients about the amount of radiation administered during a CT exam?. Each CT machine will typically provide both an estimated CTDIvol and DLP value before an exam is conducted. CTDIvol stands for volume Computed Tomography Dose Index, while DLP stands for Dose-Length Product. Neither of these is actually a measure of the dose a patient will get from the exam. They are actually designed as metrics for comparing one protocol to another, one machine to another, or even one facility to another, in terms of the amount of radiation produced by the system. As such, they can be used to guide adjustments to the ...
Non-enhanced magnetic resonance imaging (MRI) may be a viable option to ultrasonography for the surveillance of hepatocellular carcinoma (HCC), a new ...
Our results are the first documentation of defense-like behaviors evoked by activation of DLSC in the non-human primate. Activation of DLSC by the focal blockade of GABAergic inhibition evoked cowering, escape-like responses, high-pitch vocalizations, and attack of objects. These findings were unexpected in the context of the theoretical perspective presented by Dean et al. (1989) that emphasized a preferential role of primate DLSC for approach responses rather than defensive responses. Our findings indicate that the function of DLSC as a substrate for responding to threats is conserved across species.. Activation of DLSC produced defense-like responses that were both passive (i.e., cowering) and active (i.e., escape-like behavior, attack of objects), as well as an increase in defensive vocalization. For a given animal, the behavioral responses evoked from different sites within DLSC were consistent across infusions, suggesting that the various defense-like behaviors do not have independent site ...
For busy laboratories that need to get the answer right the first time, with efficient workflows, SONAR offers new possibilities, with an acquisition mode that collects MS/MS results from a Data Independent Acquisition (DIA) experiment.
By capturing many images of the heart in motion, we can build a digital model of your heart and watch it work. This allows us to detect many issues that might otherwise go undiagnosed and untreated ...
Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
TY - JOUR. T1 - Three-dimensional evaluation of root dimensions and alveolar ridge width of maxillary lateral incisors in patients with unilateral agenesis. AU - AlRushaid, Sharifah. AU - Chandhoke, Taranpreet. AU - Utreja, Achint. AU - Tadinada, Aditya. AU - Allareddy, Veerasathpurush. AU - Uribe, Flavio. PY - 2016/12/1. Y1 - 2016/12/1. N2 - Background: The objective of this retrospective case-control study was to measure the maxillary lateral incisor root dimensions and quantify the labial and palatal bone in patients with unilateral maxillary lateral incisor agenesis (MLIA) after orthodontic treatment and compare them to non-agenesis controls using cone beam computed tomography. Methods: The labiopalatal and mesiodistal root dimensions, mesiodistal coronal dimensions, and labiopalatal bone and alveolar ridge widths of the maxillary lateral incisor were assessed on posttreatment cone beam computed tomography scans of 15 patients (mean age 16.5 ± 3.4 years, 9 females and 6 males) with ...
Purpose: 4D CT is routinely performed during radiation therapy treatment planning of thoracic and abdominal cancers. Compared with the cine mode, the helical mode is advantageous in temporal resolution. However, a low pitch (∼0.1) for 4D CT imaging is often required instead of the standard pitch (∼1) for static imaging, since standard image reconstruction based on analytic method requires the low-pitch scanning in order to satisfy the data sufficient condition when reconstructing each temporal frame individually. In comparison, the flexible iterative method enables the reconstruction of all temporal frames simultaneously, so that the image similarity among frames can be utilized to possibly perform high-pitch and sparse-view helical 4D CT imaging. The purpose of this work is to investigate such an exciting possibility for faster imaging with lower dose. Methods: A key for highpitch and sparse-view helical 4D CT imaging is the simultaneous reconstruction of all temporal frames using the prior ...
All patients were scanned with a 64-slice CT scanner (Sensation 64, Siemens) equipped with a new feature in multislice CT technology, so-called z-axis flying-focus technology.13 The central 32 detector rows acquire 0.6-mm slices, and the flying-focus spot switches back and forth between 2 z positions between each reading. Two slices per detector row are acquired, which results in a higher oversampling rate in the z axis, thereby reducing artifacts related to the spiral acquisition and improving spatial resolution down to 0.4 mm3.13 Angiographic scan parameters included the following: number of slices per rotation, 32×2; individual detector width, 0.6 mm; rotation time, 330 ms; table feed, 3.8 mm per rotation; tube voltage, 120 kV; tube current, 900 mA; and prospective x-ray tube modulation, none. Calcium scoring parameters (similar unless indicated) were a tube current of 150 mA and prospective x-ray tube modulation. The radiation exposure for CT coronary angiography with this scan protocol was ...
This paper focuses on validating a novel framework for estimating the functional strain from cine cardiac magnetic resonance imaging (CMRI). The framework consists of three processing steps. First, the left ventricle (LV) wall borders are segmented using a level-set based deformable model. Second, the points on the wall borders are tracked during the cardiac cycle based on solving the Laplace equation between the LV edges. Finally, the circumferential and radial strains are estimated at the inner, mid-wall, and outer borders of the LV wall. The proposed framework is validated using synthetic phantoms of the material strains that account for the physiological features and the LV response during the cardiac cycle. Experimental results on simulated phantom images confirm the accuracy and robustness of our method ...
Point matches between images within an image sequence are identified by sparse optical flow computation and employed to compute a fundamental matrix for the epipolar geometry, which in turn is employed to derive an epipolar geometry constraint for computing dense optical flow for the image sequence. The epipolar geometry constraint may further be combined with local, heuristic constraints or robust statistical methods. Improvements in both accuracy and performance in computing optical flow are achieved utilizing the epipolar geometry constraint.
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Evidence-based recommendations on new generation cardiac CT scanners (Aquilion ONE, Brilliance iCT, Discovery CT750 HD and Somatom Definition Flash) for cardiac
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Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
Learning Medical Imaging, Cardiac CT to Contrast guides, Unique modules, Quiz of the month, Imaging pearls, Journal Club, Medical Illustrations, CME Courses|CTisus
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... solved by using cardiac ECG gating, faster scan techniques and breath hold imaging. Increasingly sophisticated techniques were ... but the image quality is limited. Instead most sequences use ECG gating to acquire images at each stage of the cardiac cycle ... Cardiac stress test Bruce protocol. Electrophysiology study. Cardiac imaging. Angiocardiography. Echocardiography TTE. TEE. ... Cardiac magnetic resonance imaging. An example of CMR movies in different orientations of a cardiac tumor - in this case, an ...
2nd Edition February 2006 Medical Imaging systems technology, Cornelius T. Leondez, published 2005 Cardiac gating technique for ... The Fourier transform of the masked image is taken. The phase of the original image is changed to the model image (the image ... Chun Yuan Cardiac gating technique for arterial oxygen saturation measurement Rasoul Yousefi; Mehrdad Nourani 2014 IEEE ... Advantage Faster than Cardiac gating and doesn't require too much co-operation from the patient. Disadvantage The choice of the ...
... gate' the acquisition. The final result is a series of images of the heart (usually sixteen), one at each stage of the cardiac ... The in vivo technique is more convenient for the majority of patients since it is less time-consuming and less costly and more ... that acquires gated 2D images of the heart using a SPECT scanner. The pixel values in such an image represent the number of ... or gated blood pool imaging, as well as SYMA scanning (synchronized multigated acquisition scanning). This mode of imaging ...
... will usually involve a gating technique, such as breathing tracking, so that image acquisition is automatically triggered ... the cardiac cycle and parathyroid washout of contrast. Downsides of 4DCT for diagnostic purposes include large and complex ... and the quality of the reconstructed images. Motion vector based Iterative Techniques are available which reconstruct a ... Recognition Techniques and Applications in Medical Imaging. Springer. p. 63. ISBN 9783642184215. Jr, Brendan C. Stack; Bodenner ...
... although cardiac magnetic resonance imaging (MRI), cardiac computed tomography, ventriculography and nuclear medicine (gated ... Prior to these more advanced techniques, the combination of electrocardiography and phonocardiography was used to accurately ... Historically, the gold standard for measurement of the ejection fraction was ventriculography, but cardiac MRI is now ... It can refer to the cardiac atrium, ventricle, gall bladder, or leg veins, although if unspecified it usually refers to the ...
... retrospective cardiac gating and respiratory compensation are employed. Beginning with cardiac gating, the patient's ECG signal ... Phase contrast MRI is one of the main techniques for magnetic resonance angiography (MRA). This is used to generate images of ... This means that these scans are cardiac-averaged so the measured blood velocities are an average over multiple cardiac cycles. ... Phase contrast magnetic resonance imaging (PC-MRI) is a specific type of magnetic resonance imaging used primarily to determine ...
Cardiac gated acquisitions are possible with SPECT, just as with planar imaging techniques such as multi gated acquisition scan ... such as functional cardiac or brain imaging. Myocardial perfusion imaging (MPI) is a form of functional cardiac imaging, used ... such as tumor imaging, infection (leukocyte) imaging, thyroid imaging or bone scintigraphy. Because SPECT permits accurate ... In the nuclear power sector, the SPECT technique can be applied to image radioisotope distributions in irradiated nuclear fuels ...
... gated blood-pool imaging MeSH E01.370.370.050.650.650.950 - ventriculography, first-pass MeSH E01.370.370.065 - angioscopy MeSH ... electrophysiologic techniques, cardiac MeSH E01.370.370.380.250 - exercise test MeSH E01.370.370.380.400 - heart auscultation ... gated blood-pool imaging MeSH E01.370.350.710.715.710.950 - ventriculography, first-pass MeSH E01.370.350.710.800 - tomography ... gated blood-pool imaging MeSH E01.370.370.380.710.950 - ventriculography, first-pass MeSH E01.370.370.380.950 - valsalva ...
One of the 2020 systems was operate at Brigham and Women's Hospital attempting cardiac gated imaging. Also in the product line ... "Image Reconstruction from Projections," page 56). In that technique a series of X-ray exposures made from different angles ... A digital image was acquired without contrast and one with, and the images subtracted from each other leaving the arterial ... One of the units at the Cleveland Clinic was used to construct an image of the body that today would be called a "Scout View", ...
Certain techniques such as fMRI image tissues (particularly cerebral tissues) by blood flow and thus show metabolism. Also, ... a cardiac gated time sequence, or a spatial sequence where the gamma-camera is moved relative to the patient. SPECT (single ... The end result of the nuclear medicine imaging process is a "dataset" comprising one or more images. In multi-image datasets ... The fusion imaging technique in nuclear medicine provides information about the anatomy and function, which would otherwise be ...
Cardiac gated acquisitions are possible with SPECT, just as with planar imaging techniques such as multi gated acquisition scan ... Main article: Myocardial perfusion imaging. Myocardial perfusion imaging (MPI) is a form of functional cardiac imaging, used ... such as functional cardiac or brain imaging. Myocardial perfusion imagingEdit. This section needs additional citations for ... Single-photon emission computed tomography (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique ...
... size from rodents to human biopsies Lung imaging using respiratory gating Cardiovascular imaging using cardiac gating Imaging ... 2017-01-27). "Advanced Non-Destructive Ocular Visualization Methods by Improved X-Ray Imaging Techniques". PLOS ONE. 12 (1): ... April 2016). "Trichobilharzia regenti (Schistosomatidae): 3D imaging techniques in characterization of larval migration through ... creating projection images that later will be used to reconstruct the image cross-sections. In an open system, X-rays may ...
Rapid NMR imaging of dynamic processes using the FLASH technique. Magn Reson Med 3:321-327 [3] doi:10.1002/mrm.1910030217 S ... Applying a Level Set Method for Resolving Physiologic Motions in Free-Breathing and Non-gated Cardiac MRI. FIMH, 2013, " ... Zhang S, Olthoff A and Frahm J. Real-time magnetic resonance imaging of normal swallowing. J Magn Reson Imaging 2011;35:1372- ... so that high-quality images may be obtained out of as little as 5 to 10% of the data required for a normal image reconstruction ...
... is a nuclear medicine imaging technique, typically for the heart in myocardial perfusion imagery. An ... 26 January 2008). "EANM/ESC guidelines for radionuclide imaging of cardiac function" (PDF). European Journal of Nuclear ... images shows the heart as it contracts over the interval from one R wave to the next. Gated myocardial perfusion imaging has ... or a change in the heart rate during acquisition can degrade the quality of the resulting gated image dataset. Paul, AK; Nabi, ...
"Ionizing radiation in cardiac imaging: a science advisory from the American Heart Association Committee on Cardiac Imaging of ... image reconstruction. In this technique, a portion of the heart is imaged during one heart cycle while an ECG trace is recorded ... The latest MSCT scanners acquire images only at 70-80% of the R-R interval (late diastole). This prospective gating can reduce ... allowing excellent imaging of the coronary arteries (cardiac CT angiography). Images with even higher temporal resolution can ...
Contrast-enhanced MR angiography with breath-hold and cardiac gating techniques can allow evaluation of the extent of the ... Tran, Kim H.; Boechat, M. Ines (2006). "Idiopathic infantile arterial calcification: Imaging evaluation and the usefulness of ... Sundaram, S; Kuruvilla, S; Thirupuram, S (2004). "Idiopathic arterial calcification of infancy - a case report". Images in ... 1989). "Idiopathic infantile arterial calcification with cardiac, renal and central nervous system involvement". European ...
... refers to iterative algorithms used to reconstruct 2D and 3D images in certain imaging techniques. For ... Applying a Level Set Method for Resolving Physiologic Motions in Free-Breathing and Non-gated Cardiac MRI. FIMH, 2013, " ... Here is an example that illustrates the benefits of iterative image reconstruction for cardiac MRI. Tomographic reconstruction ... In Magnetic Resonance Imaging it can be used to reconstruct images from data acquired with multiple receive coils and with ...
What's New in Cardiac Imaging?: SPECT, PET, and MRI Springer, 1992, p. 41. ... Patel, C. K. N.; Bennett Jr., W. R.; Faust, W. L.; McFarlane, R. A. Infrared spectroscopy using stimulated emission techniques ... Yamakura, T.; Harris, R. A. Effects of gaseous anesthetics nitrous oxide and xenon on ligand-gated ion channels. Comparison ... The Encyclopaedia of Medical Imaging. Taylor & Francis, 1998, p. 194. *↑ Warren, W. W.; Norberg, R. E. Nuclear Quadrupole ...
Thus, it took the participant longer to walk mentally through a narrow gate than to walk through a larger gate placed at the ... Mental practice is a technique used in music as well. Professional musicians may use mental practice when they are away from ... Measurements of cardiac and respiratory activity during motor imagery and during actual motor performance revealed a ... These methods have revealed that motor images retain many of the properties, in terms of temporal regularities, programming ...
Gibb's work started with X-ray images, not CT or MRI images, for the reconstruction of a human phantom which was used for ... which is used to simulate cardiac and respiratory motions with more realistic modeling of the cardiac system. A polygonal mesh ... The proposed technique used to create the race-specific statistical phantom maintains anatomic realism and provides the ... at Rensselaer Polytechnic Institute used the 3D VIP-Man phantom to simulate respiratory motions by adopting the gated ...
Use of new imaging techniques to screen for coronary artery disease". Circulation. 108 (8): e50-3. doi:10.1161/01.CIR. ... The CAC score is an independent marker of risk for cardiac events, cardiac mortality, and all-cause mortality. In addition, it ... such as retrospective vs prospective gating) it is difficult for a patient to know what their radiation exposure will be. A ... "Lesion-specific coronary artery calcium quantification better predicts cardiac events". InBiomedical Imaging: From Nano to ...
... fast imaging sequences, increased readout bandwidth and avoiding gradient-echo imaging when metal is present. A technique ... Several methods can be used to reduce motion artifacts, including patient immobilisation, cardiac and respiratory gating, ... A motion artifact is one of the most common artifacts in MR imaging. Motion can cause either ghost images or diffuse image ... Periodic movements such as cardiac movement and blood vessel or CSF pulsation cause ghost images, while non-periodic movement ...
The source locations can be combined with magnetic resonance imaging (MRI) images to create magnetic source images (MSI). The ... Another common technique is beamforming, wherein a theoretical model of the magnetic field produced by a given current dipole ... Hirano Y, Hirano S, Maekawa T, Obayashi C, Oribe N, Monji A, Kasai K, Kanba S, Onitsuka T (March 2010). "Auditory gating ... It is primarily used to remove artifacts such as blinking, eye muscle movement, facial muscle artifacts, cardiac artifacts, etc ...
Different advanced techniques, including finite elements algorithms, are being designed to fulfill the computational ... Generally, the field has focused on topics, such as image processing, the electronic patient record, equipment development, the ... Cardiac Output Monitoring and Diagnostic Unit) which improved artificial heart flux measurement. This device was then used ... and Field Programmable Gate Array (FPGA, Altera MAX+PLUS). Signal communication USB, RS232 and digital filters implementation ...
C-mode: A C-mode image is formed in a plane normal to a B-mode image. A gate that selects data from a specific depth from an A- ... is a diagnostic imaging technique, or therapeutic application of ultrasound. It is used to create an image of internal body ... "The use of lung ultrasound images for the differential diagnosis of pulmonary and cardiac interstitial pathology". Journal of ... Color Doppler images are generally combined with gray scale (B-mode) images to display duplex ultrasonography images. Uses ...
Use of any one of these imaging modalities enables the physician to view the placement of the needle. Electrical stimulation ... The lumbar plexus block is an advanced technique indicated for hip, anterior thigh, and knee surgery. The lumbar plexus is ... Additionally, it may lead to seizures, arrhythmias, and may progress to cardiac arrest. This reaction may stem from an allergy ... Lidocaine preferentially binds to the inactivated state of voltage-gated sodium channels, but has also been found to bind ...
What's New in Cardiac Imaging?: SPECT, PET, and MRI. Springer. ISBN 0-7923-1615-0. Frank, John (1999). "Introduction to imaging ... Yamakura, T.; Harris, R. A. (2000). "Effects of gaseous anesthetics nitrous oxide and xenon on ligand-gated ion channels. ... "Infrared spectroscopy using stimulated emission techniques". Physical Review Letters. 9 (3): 102-104. Bibcode:1962PhRvL...9.. ... Gamma emission from the radioisotope 133Xe of xenon can be used to image the heart, lungs, and brain, for example, by means of ...
C-mode: A C-mode image is formed in a plane normal to a B-mode image. A gate that selects data from a specific depth from an A- ... is a diagnostic imaging technique based on the application of ultrasound. It is used to create an image of internal body ... Reves, J. G.; Estafanous, Fawzy G.; Barash, Paul G. (2001). Cardiac anesthesia: principles and clinical practice. Hagerstwon, ... Color Doppler images are generally combined with grayscale (B-mode) images to display duplex ultrasonography images. Uses ...
"3D VR Image Rendered by Google Cardboard Sets A Milestone in the History of Cardiac Surgery". Doximity. Retrieved 2016-05-24.. ... a new operative technique". Journal of Cardiac Surgery. 8 (5): 537-40. doi:10.1111/j.1540-8191.1993.tb00409.x. PMID 8219533.. ... "Research Gate. Retrieved 23 December 2014.. *^ Burke, Redmond (March 1995). "Video-Assisted Thoracoscopic Vascular Ring ... "MCH Cardiac Program Real Time Outcomes in Congenital Heart Surgery". www.pediatricheartsurgery.com. Retrieved 18 December 2014. ...
Cave gates are sometimes installed to limit human entry into caves with sensitive or endangered bat species. The gates are ... "Revue Scientifique et Technique. 19 (1): 177-196. doi:10.20506/rst.19.1.1221. PMID 11189715. Bats, which represent ... By repeated scanning, bats can mentally construct an accurate image of the environment in which they are moving and of their ... Cardiac output is directly derived from heart rate and stroke volume of the blood;[69] an active microbat can reach a heart ...
Benzodiazepines are positive allosteric modulators of the GABA type A receptors (GABAA). The GABAA receptors are ligand-gated ... Elderly and very ill patients can possibly suffer apnea or cardiac arrest. Concomitant use of other central nervous system ... but confirmation and quantitation are usually performed using chromatographic techniques.[97][98][99] ... Riss J, Cloyd J, Gates J, Collins S (August 2008). "Benzodiazepines in epilepsy: pharmacology and pharmacokinetics". Acta ...
The sub images were extracted from a 61-hour time-lapse microscopy video, created using quantitative phase-contrast microscopy ... A caspase 8 knock-out leads to cardiac failure and thus embryonic lethality. However, with the use of cre-lox technology, a ... There are also various biochemical techniques for analysis of cell surface markers (phosphatidylserine exposure versus cell ... Böhm I, Schild H (2003). "Apoptosis: the complex scenario for a silent cell death". Molecular Imaging and Biology. 5 (1): 2-14 ...
Quantum imaging. *Quantum information. *Quantum key distribution. *Quantum logic. *Quantum logic gates ... Ptaszek LM, Mansour M, Ruskin JN, Chien KR (2012). "Towards regenerative therapy for cardiac disease". The Lancet. 379 (9819): ... This controversy primarily targets the techniques used to derive new embryonic stem cell lines, which often requires the ... Adipose and bone marrow derived stem cells were removed and induced to a cardiac cell fate before being injected into the heart ...
Cardiac effects: oxytocin and oxytocin receptors are also found in the heart in some rodents, and the hormone may play a role ... Viviani D, Charlet A, van den Burg E, Robinet C, Hurni N, Abatis M, Magara F, Stoop R (July 2011). "Oxytocin selectively gates ... The biologically active form of oxytocin, commonly measured by RIA and/or HPLC techniques, is also known as the octapeptide " ... Interactive image. SMILES. *. CC[[email protected]](C)[[email protected]@H]1NC(=O)[[email protected]](Cc2ccc(O)cc2)NC(=O)[[email protected]@H](N)CSSC[[email protected]](NC(=O)[[email protected]](CC(N)=O)NC(=O)[[email protected] ...
Cardiac action potentialsEdit. Main articles: Cardiac action potential, Electrical conduction system of the heart, Cardiac ... One type is generated by voltage-gated sodium channels, the other by voltage-gated calcium channels. Sodium-based action ... Image of two Purkinje cells (labeled as A) drawn by Santiago Ramón y Cajal in 1899. Large trees of dendrites feed into the soma ... Neher E (1992). "The patch clamp technique". Scientific American. 266 (3): 44-51. Bibcode:1992SciAm.266c..44N. doi:10.1038/ ...
Main article: Cardiac pacemaker. Cells in the sinoatrial node, located in the right atrium of the heart, spontaneously ... Over the last decades more insight has been gained, especially with advances in brain imaging. A major area of research in ... Large-scale activity can be measured by techniques such as EEG. In general, EEG signals have a broad spectral content similar ... In particular, voltage-gated ion channels are critical in the generation of action potentials. The dynamics of these ion ...
The cardiac centers monitor baroreceptor firing to maintain cardiac homeostasis, a mechanism called the baroreceptor reflex. ... Meditation techniques have been developed to ease anxiety and have been shown to lower HR effectively. Doing simple deep and ... It opens chemical or ligand-gated sodium and calcium ion channels, allowing an influx of positively charged ions.[11] ... Clin Physiol Funct Imaging. 23 (3): 166-70. doi:10.1046/j.1475-097X.2003.00491.x. PMID 12752560.. ...
... and are the imaging techniques of choice for pregnant women.[139] Projectional radiography, X-ray computed tomography and ... Increases in blood sugar, breathing, and cardiac output are all required. Levels of progesterone and oestrogens rise ... Dowswell, Therese; Carroli, Guillermo; Duley, Lelia; Gates, Simon; Gülmezoglu, A Metin; Khan-Neelofur, Dina; Piaggio, Gilda (16 ... Main article: Medical imaging in pregnancy. Medical imaging may be indicated in pregnancy because of pregnancy complications, ...
Several techniques such as intracellular recording, patch-clamp, and voltage-clamp technique, pharmacology, confocal imaging, ... As the rising phase reaches its peak, voltage-gated Na+ channels are inactivated whereas voltage-gated K+ channels are ... Moreover, the distinctions based on function between neurons and other cells such as cardiac and muscle cells are not helpful. ... The undershoot phase occurs because unlike voltage-gated sodium channels, voltage-gated potassium channels inactivate much more ...
POCD also appears to occur in non-cardiac surgery. Its causes in non-cardiac surgery are less clear but older age is a risk ... Techniques[edit]. Anesthesia is unique in that it is not a direct means of treatment; rather, it allows others to do things ... Jones L, Othman M, Dowswell T, Alfirevic Z, Gates S, Newburn M, et al. (March 2012). "Pain management for women in labour: an ... Choice of surgical method and anesthetic technique aims to reduce risk of complications, shorten time needed for recovery and ...
"Quantitative phase contrast microscopy - label-free live cell imaging and quantification". Phase Holographic Imaging AB.. ... A caspase 8 knock-out leads to cardiac failure and thus embryonic lethality. However, with the use of cre-lox technology, a ... There are also various biochemical techniques for analysis of cell surface markers (phosphatidylserine exposure versus cell ... Böhm I, Schild H (2003). "Apoptosis: the complex scenario for a silent cell death". Mol Imaging Biol. 5 (1): 2-14. doi:10.1016/ ...
Cardiac gap junctions can pharmacologically be opened with rotigaptide. NeuronsEdit. A gap junction located in neurons is often ... Light microscope images do not allow us to see connexons themselves but do let us see the fluorescing dye injected into one ... Hu, X; Dahl, G (1999). "Exchange of conductance and gating properties between gap junction hemichannels". FEBS Lett. 451 (2): ... When viewed in the plane of the membrane by freeze-fracture techniques, higher-resolution distribution of connexons within the ...
... and are the imaging techniques of choice for pregnant women.[151] Projectional radiography, CT scan and nuclear medicine ... Increases in blood sugar, breathing, and cardiac output are all required. Levels of progesterone and estrogens rise continually ... Dowswell T, Carroli G, Duley L, Gates S, Gülmezoglu AM, Khan-Neelofur D, Piaggio G, et al. (American College of Obstetricians ... Main article: Medical imaging in pregnancy. Medical imaging may be indicated in pregnancy because of pregnancy complications, ...
Signs of advanced severe infection are those of anemia and protein deficiency, including emaciation, cardiac failure, and ... For example, the Bill & Melinda Gates Foundation recently donated US$34 million to fight Neglected Tropical Diseases including ... These health education programs often stress important preventative techniques such as: washing your hands before eating, and ... CDC Department of Parasitic Diseases images of the hookworm life cycle. *Centers for Disease Control and Prevention ...
Cardiac stress test Bruce protocol. Electrophysiology study. Cardiac imaging. Angiocardiography. Echocardiography TTE. TEE. ... A second technique, called the Holger Nielsen technique, described in the first edition of the Boy Scout Handbook in the United ... Gates S (March 2015). "Mechanical versus manual chest compression for out-of-hospital cardiac arrest (PARAMEDIC): a pragmatic, ... as cardiac arrest in children is more likely to have a non-cardiac cause. In a 2010 prospective study of cardiac arrest in ...
Cardiac stress test Bruce protocol. Electrophysiology study. Cardiac imaging. Angiocardiography. Echocardiography TTE. TEE. ... Distortion poses significant challenges to healthcare providers,[32] who employ various techniques[34] and strategies to safely ... Computed tomography angiography (CTA) and magnetic resonance angiography (MRA) of the heart (ECG is used to "gate" the scanning ... Myocardial perfusion imaging. Cardiovascular MRI. Ventriculography Radionuclide ventriculography. Cardiac catheterization/ ...
Due to these techniques, there is a reduced duration of hospital stays, blood loss, transfusions, and use of pain medication.[4 ... Quantum imaging. *Quantum information. *Quantum key distribution. *Quantum logic. *Quantum logic gates ... Kypson AP, Chitwood Jr WR (2004). "Robotic Applications in Cardiac Surgery". International Journal of Advanced Robotic Systems ... McConnell PI, Schneeberger EW, Michler RE (2003). "History and development of robotic cardiac surgery". Problems in General ...
And the more spectators paid at the gate, the higher the prizes could be and the greater was the incentive of riders to stay ... Among the treatments they supplied was nitroglycerine, a drug used to stimulate the heart after cardiac attacks and which was ... This is the case with muscle dysmorphia, where an athlete wants a more muscular physique for functionality and self- image ... A member of the IOC Medical Commission, Manfred Donike, privately ran additional tests with a new technique for identifying ...
CNT enabled x-ray sources for medical imaging are also in development. Relying on the unique properties of the CNTs, ... In 2003 room-temperature ballistic transistors with ohmic metal contacts and high-k gate dielectric were reported, showing 20- ... 2 and cardiac troponin. Similar CNT sensors support food industry, military and environmental applications.[2] ... involves the joint efforts of seven European research and industry partners on fabrication techniques and processes to enable ...
Palmer BF, Gates JR, Lader M (November 2003). "Causes and management of hyponatremia". The Annals of Pharmacotherapy. 37 (11): ... Savitz JB, Drevets WC (April 2013). "Neuroreceptor imaging in depression". Neurobiology of Disease. 52: 49-65. doi:10.1016/j. ... Therapies associated with depression include interferons, beta-blockers, isotretinoin, contraceptives,[64] cardiac agents, ... Psychoanalytic techniques are used by some practitioners to treat clients presenting with major depression.[176] A more widely ...
... cardiac arrests did not occur in areas equipped with ceiling shelves hence no images could be used to objectively test for ... "Research Gate public profile".. *^ a b UK Charity Commission. 296655 - The International Association For Near-Death Studies UK ... perhaps automated cardiopulmonary resuscitation techniques, the use of targeted temperature management, extracorporeal membrane ... A review article analysing the results reports that, out of 2060 cardiac arrest events, 101 of 140 cardiac arrest survivors ...
It can be diagnosed through imaging techniques and serological tests.[33]. Endemic treponematoses (Yaws)[edit]. Main article: ... In 2013, the Government of Japan, five Japanese pharmaceutical companies, the Bill and Melinda Gates Foundation, and the UNDP ... cardiac, and digestive lesions.[23] ... Bill and Melinda Gates Foundation, UK Department for ... Melinda Gates Foundation, the world's 13 leading pharmaceutical companies, and government representatives from US, UK, United ...
Van Winkle, A. P.; Gates, I. D.; Kallos, M. S. (2012). "Mass Transfer Limitations in Embryoid Bodies during Human Embryonic ... Phase image of EBs in suspension culture. Individual EBs are composed of approximately 1000 mESCs ... Additionally, EBs can be formed from embryonic stem cells derived through alternative techniques, including somatic cell ... "Three-Dimensional Culture Alters Primary Cardiac Cell Phenotype". Tissue Engineering Part A. 16 (2): 629-641. doi:10.1089/ten. ...
ˌsɪərə-/[6][7][8]) or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter that has a popular image as a contributor to ... Baskin SI (1991). Principles of cardiac toxicology. Boca Raton: CRC Press. ISBN 0-8493-8809-0. Retrieved 3 February 2010.. ... Except for the 5-HT3 receptor, a ligand-gated ion channel, all other 5-HT receptors are G-protein-coupled receptors (also ... In 1964, Dahlstrom and Fuxe (discussed in [2]), using the Falck-Hillarp technique of histofluorescence, observed that the ...
Expression of cardiac NOS2 has been associated with myocardial dysfunction. Therefore, we evaluated chagasic cardiomyopathy in ... To evaluate the role of gated cardiac magnetic imaging resonance (MRI) in Chagas' disease, we infected mice with ... Techniques for Hemagglutination and Hemagglutination-Inhibition with Arthropod-Borne Viruses D. H. Clarke and J. Casals ... f Application of cardiac gated magnetic resonance imaging in murine Chagas' disease. * L A Jelicks, J Shirani, M Wittner, ...
"Cardiac-Gated Imaging Techniques" by people in this website by year, and whether "Cardiac-Gated Imaging Techniques" was a major ... Cardiac-Gated Imaging Techniques*Cardiac-Gated Imaging Techniques. *Cardiac Gated Imaging Techniques ... "Cardiac-Gated Imaging Techniques" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH ( ... Below are the most recent publications written about "Cardiac-Gated Imaging Techniques" by people in Profiles. ...
computer assisted image processing. Magnetic resonance imaging (MRI) is a truly non-invasive technique which is not associated ... MRI of the coronary arteries is, however, a challenging task owing to motion of the vessels during cardiac contraction and ... Vital Images Inc, Minneapolis, Minnesota, USA). In the volume rendering technique, all image pixels are integrated to project a ... Respiratory gated MRCA is a technique with an uncomplicated setup that can be performed in a clinical setting. At this stage of ...
To perform a systematic review and meta-analysis of the diagnostic value of prospective ECG-gating coronary CT angiography in ... Cardiac-Gated Imaging Techniques* * Coronary Angiography / methods* * Coronary Stenosis / diagnostic imaging* * Coronary ... Int J Cardiovasc Imaging. 2012 Dec;28(8):2109-19. doi: 10.1007/s10554-011-0006-0. Epub 2012 Jan 4. ... The mean effective dose was 3.3 mSv (95% CI: 2.3, 4.1 mSv) for the prospective ECG-gating coronary CT angiography. This ...
... using phase analysis of gated single photon emission co ... Electrophysiologic Techniques, Cardiac / methods. Female. ... Accessory Atrioventricular Bundle / complications, pathology, radionuclide imaging*. Adult. Cardiac-Gated Single-Photon ... LV dyssynchrony as assessed by phase analysis of gated SPECT myocardial perfusion imaging in patients with Wolff-Parkinson- ... myocardial perfusion imaging (MPI).. METHODS: Forty-five WPW patients were enrolled and had gated SPECT MPI pre- and 2-3 days ...
Objective This study evaluated the respiratory motion of lungs using a nonlinear motion correction technique for respiratory- ... gated single photon emission computed tomography (SPECT) images. ... Development of a new dynamic NURBS-based cardiac-torso (NCAT) ... K 2006Lung motion correction on respiratory gated 3-D PET/CT imagesIEEE Trans Med Imaging2547685PubMedCrossRefGoogle Scholar ... K 2006Nonlinear motion correction of respiratory-gated lung SPECT imagesIEEE Trans Med Imaging2548695PubMedCrossRefGoogle ...
... magnetic resonance imaging (MRI) of flow using phase contrast (PC) methods is accomplished using methods that resolve single- ... Cardiac-Gated Imaging Techniques / methods* * Cardiovascular Diseases / diagnosis* * Humans * Image Enhancement / methods* ... Based on these developments, an overview is provided over the potential this new imaging technique has in different parts of ... J Magn Reson Imaging. 2012 Nov;36(5):1015-36. doi: 10.1002/jmri.23632. ...
... chemical shift imaging, diffusion imaging, functional MRI. Flow imaging, MR angiography, cardiac gated imaging. Hardware for ... Artefacts in diagnostic images. Biological effects of ultrasound. Safety regulations. Quality assurance. New techniques, ... X-rays as a diagnostic imaging tool. X-ray equipment design and use; image formation and factors affecting it. Radiation doses ... Topics covered include image formation, representation and display; image degradation and restoration; intensity and colour ...
Cardiac-Gated Imaging Techniques / methods* * Coronary Artery Disease / diagnostic imaging * Coronary Artery Disease / etiology ... Eur J Nucl Med Mol Imaging. 2010 Dec;37(12):2256-63. doi: 10.1007/s00259-010-1599-6. Epub 2010 Sep 4. ... Reduced coronary flow reserve in patients with primary hyperparathyroidism: a study by G-SPECT myocardial perfusion imaging ... using 99mTc-sestamibi by measuring first-transit counts in the pulmonary artery and myocardial count rate from G-SPECT images. ...
Topic III: Lab Techniques, Gated SPECT, Artifact Recognition, Instrument QC. Radionuclide Ventricular Function Imaging: Basic ... Focused Topic 2: 99mTc PYP Imaging for Cardiac TTR Amyloidosis, Key Points, and Case Review (20 mins). Prem Soman, MD, PhD, ... Interpret perfusion images, including PET and ventricular function imaging. *Utilize perfusion imaging in the assessment, ... Topic IV: Cardiac PET, Perfusion, Viability, Cases with Experts PET, Interpretation. Cardiac PET: Basics of Perfusion, ...
... and power and frequency mapping with cardiac-gated and/or asynchronous magnetic resonance (MR) phase contrast (PC) techniques ... To characterize cardiac- and respiratory-driven cerebrospinal fluid (CSF) motions in intracranial space noninvasively, four- ... Cardiac-gated and asynchronous PC techniques. The cardiac-gated PC technique is the combination of continuous PC acquisition ... CSF motion visualization based on cardiac-gated PC imaging. Cardiac-gated PC velocity measurement was performed in three ...
... anatomical CT and MR images were used to delineate the gross tumour volumes (GTVs) for radiotherapy treatment planning. The ... List mode-driven cardiac and respiratory gating in PET. J Nucl Med 2009;50:674-81.PubMedCrossRefGoogle Scholar ... Boudraa A, Zaidi H. Image segmentation techniques in nuclear medicine imaging. In: Zaidi H, editor. Quantitative analysis of ... Image segmentation using deformable models. In: Sonka M, Fitzpatrick JM, editors. Handbook of medical imaging: medical image ...
What are the contraindications for the alternative imaging techniques? * Ultrasound * Gated CT ... Preliminary Diagnosis: Cardiac tumors. I. What imaging technique is first-line for this diagnosis?. Cardiac MRI with ... I. What imaging technique is first-line for this diagnosis? * II. Describe the advantages and disadvantages of this technique ... What alternative imaging techniques are available? * V. Describe the advantages and disadvantages of the alternative techniques ...
Cardiac evaluation requires either ECG gated MRI or cine MRI.. Ischemic Heart Disease. At the present time MRI has limited ... Magnetic resonance imaging (MRI) is a new and innovative technique that affords anatomic images in multiple planes and may ... peripheral gating, chemical shift imaging, and fast scanning (gradient refocused images), may resolve many of these problems. ... Gated MRI is capable of defining many malformations of the cardiac chambers and the great vessels, such as transposition and ...
A number of techniques can be used to minimize dose from cardiac CT. For calcium scoring, prospective gating is recommended. ... Thus, physicians ordering and performing cardiac imaging should be very familiar with the dosage of radiation from cardiac ... Several studies have estimated E of cardiac CT (Table 7).33-53 Mean E for calcium scoring using retrospective gating ranges ... 56 Another possibility for lowering the dose in cardiac CT is the employment of prospective gating to only acquire images ...
Gated Blood-pool Imaging. Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at ... Analysis of right ventricular function is difficult with this technique; that is best evaluated by first-pass ventriculography ... specific times in the cycle, using an electrocardiographic synchronizer or gating device. ...
... is a noninvasive method to image the coronary arteries. Applications include the following: Diagnosis of coronary artery ... Prospectively gated transverse coronary CT angiography versus retrospectively gated helical technique: improved image quality ... This technique requires retrospective gating and a regular heart rate. [4] For data from several cardiac cycles to be used for ... This technique requires retrospective gating and a regular heart rate. [39] For data from several cardiac cycles to be used for ...
A simple thresholding technique was used to generate binary images from nongated SPECT images. The K-means cluster ... to validate the gated SPECT cardiac quantification (GSCQ) method in phantoms and patients, and to determine normal values of ... New hybrid count- and geometry-based method for quantification of left ventricular volumes and ejection fraction from ECG-gated ... Section of Cardiovascular Medicine, Department of Internal Medicine, Cardiovascular Nuclear Imaging Laboratory, Yale University ...
... were obtained by cine imaging and both delayed enhancement techniques. All images were ECG gated. ... Cardiac morphology, function, viability, stress-rest perfusion, and coronary imaging could be performed in under an hour. ... Timing of DE-CMR Techniques Subsecond imaging was performed immediately before standard imaging. Because subsecond imaging took ... This rapid technique can potentially speed up imaging 10- to 20-fold and enable image acquisition of the entire heart during ...
... solved by using cardiac ECG gating, faster scan techniques and breath hold imaging. Increasingly sophisticated techniques were ... but the image quality is limited. Instead most sequences use ECG gating to acquire images at each stage of the cardiac cycle ... Cardiac stress test Bruce protocol. Electrophysiology study. Cardiac imaging. Angiocardiography. Echocardiography TTE. TEE. ... Cardiac magnetic resonance imaging. An example of CMR movies in different orientations of a cardiac tumor - in this case, an ...
One such package is the VIDA™ imaging software developed at the Cardiac Imaging Research Center, Department of Radiology at the ... Developments in recent years to three-dimensional imaging have gone a long way toward providing satisfactory techniques to non- ... Cardiac Pacemakers, Inc.. Respiratory therapy control based on cardiac cycle. US8002553. 18. Aug. 2003. 23. Aug. 2011. Cardiac ... Cardiac Pacemakers, Inc.. Implantable cardiac device with dyspnea measurement. US8915741. 23. Aug. 2011. 23. Dez. 2014. Cardiac ...
... intermittent or gated imaging techniques have been used. By acquiring an image frame at each cardiac cycle (or after several ... A PD image is an energy image in which the energy of the flow signal is displayed. These images give no velocity information ... or range gate, is shown as an overlay on the B-mode image. The placement and size of the range gate is determined by the user. ... The gate length is computed as lg=0.44 mm. (15) The pulse-repetition frequency is f. prf. ≤. c. 2. d. 0. ≈. 25. KHz. .. (. 16. ...
Image quality is enhanced during this technique by the fact that there is no table motion during imaging. ... Prospectively gated coronary CT angiography versus retrospectively gated helical technique. Radiology. 2008;246:742-753. PMID: ... imaging modalities of echocardiography and X-ray angiography, providing detailed assessment of cardiac and extra-cardiac ... Single sector gating is also limited to heart rates less than 75 BPM. Imaging during a small portion of the R-R interval does ...
The first outcome is that, according to our results, MDCT cardiac software imaging technique is able to measure the features of ... using cardiac gating (120 kV; 350 mAs; 64 × 0, 625 mm; rot 0, 4 sec; pitch 0.299), from the aortic arch to the cardiac base, ... Our study indicates for the first time the chance to apply CT cardiac imaging software in the study of pulmonary vessels and ... K. W. Kang, H. J. Chang, Y. J. Kim, B. W. Choi et al., "Cardiac magnetic resonance imaging-derived pulmonary artery ...
Similarly, poor gating can result in slice misregistration artifact. This artifact can be minimized through image ... Current efforts to use hybrid-imaging techniques, such as single-photon emission CT (SPECT)/CT and positron emission tomography ... 45 One advantage of using cardiac CTA over stress imaging in the emergency department is that cardiac CTA can exclude ... 64 Additionally, several imaging societies have collaborated on the 2006 Appropriateness Criteria for Cardiac CT Imaging. 65 ...
... aorta with maintenance of image quality and sharpness is achievable using a prospective cardiac gated low kilovoltage technique ... Dual-source CT angiography of the thoracic aorta using prospective cardiac gating and a low kilovoltage technique. *Cormac ... To investigate the effects of prospective cardiac gating and low kilovoltage parameters on image quality and radiation dose ... Cardiac gating leads to less artifacts and more accurate measurements of the thoracic aorta and root. Without gating the aortic ...
... yet the growing use of cardiac CT has... ... is an important noninvasive imaging modality for evaluating ... low-pitch helical imaging with retrospective ECG gating.9 Functional information cannot be obtained with this imaging technique ... Helical prospective ECG-gating in cardiac computed tomography: Radiation dose and image quality. Int J Cardiovasc Imaging. 2010 ... Ionizing radiation in cardiac imaging: A science advisory from the American Heart Association Committee on Cardiac Imaging of ...
Cardiac and respiratory-gated volumetric murine ultrasound. Arvin H. Soepriatna, Frederick W. Damen, Pavlos P. Vlachos, Craig J ... April 2017: 4D Cardiac Murine Ultrasound: Comparison to Traditional Techniques and MRI. Presented by Dr. Craig Goergen, ... Perform image-guided cardiac injections. *Monitor full animal physiology while imaging: body temperature, ECG and respiratory ... With the Vevo Imaging Systems you can:. *Perform cardiovascular phenotyping for cardiac structure and function ...
... imaging explanation free. What is imaging? Meaning of imaging medical term. What does imaging mean? ... Looking for online definition of imaging in the Medical Dictionary? ... gated cardiac blood pool imaging equilibrium radionuclide angiocardiography.. gated magnetic resonance imaging a method for ... Related to imaging: imaging techniques, Computer imaging. imaging. [im´ij-ing] the production of diagnostic images, e.g., ...
  • PURPOSE: The purpose of this study was to evaluate left ventricular (LV) mechanical dyssynchrony in patients with Wolff-Parkinson-White (WPW) syndrome pre- and post-radiofrequency catheter ablation (RFA) using phase analysis of gated single photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI). (biomedsearch.com)
  • This study evaluated the respiratory motion of lungs using a nonlinear motion correction technique for respiratory-gated single photon emission computed tomography (SPECT) images. (springer.com)
  • Coronary computed tomography angiography (CCTA) is a noninvasive method to image the coronary arteries. (medscape.com)
  • Cardiac computed tomography (CT) has the capacity to directly visualize the coronary arteries. (appliedradiology.com)
  • We have previously developed a new method for quantitative assessment of left ventricular (LV) volumes and ejection fraction (EF) from electrocardiography-gated single photon emission computed tomography (SPECT). (nih.gov)
  • Over the past decade, computed tomography (CT) has emerged as an important noninvasive imaging modality for the evaluation of cardiovascular diseases. (appliedradiology.com)
  • Single photon emission computed tomography (SPECT) is a nuclear medicine imaging technique using gamma rays. (utah.edu)
  • Contrast-enhanced coronary Computed Tomography Angiography (CTA) is a potential imaging technique to identify atherosclerotic plaques in the whole coronary tree, but it fails to provide information about vessel walls. (hindawi.com)
  • However, magnetic resonance imaging and computed tomography are often necessary, particularly for assessment of extracardiac anatomy or specific vascular connections or relationships, which may be complex in postoperative patients. (aafp.org)
  • Although magnetic resonance imaging and computed tomography can provide volumetric data for more comprehensive evaluation of cardiac anatomy and function, magnetic resonance imaging does not require patient exposure to ionizing radiation or nephrotoxic iodinated contrast media. (aafp.org)
  • Diagnostic imaging procedures for adults with suspected CHD include chest radiography, echocardiography (transthoracic and transesophageal), nuclear scintigraphy, cardiac-gated computed tomography (CT), magnetic resonance imaging (MRI), and cardiac catheterization and angiography. (aafp.org)
  • The addition of electrocardiographic (ECG) gating to technetium-99m (Tc-99m) sestamibi single-photon emission computed tomography (SPECT) perfusion imaging can provide additional and potentially useful information [1-17] . (onlinejacc.org)
  • Electrocardiographic Gated single photon emission computed tomography (EGS) supplies worthwhile functional data to cardiologists. (scialert.net)
  • He generated images using a technique analogous to that employed in x-ray computed tomography, known as back-projection-reconstruction. (jci.org)
  • It is the only widely available test for assessing myocardial perfusion directly, but there are variations in the way it is performed in different monclerdonna.biz by: Myocardial perfusion single photon emission-computed tomography (MPS) has been one of the most important and common non-invasive diagnostic cardiac test. (monclerdonna.biz)
  • It can also detect regions of myocardial infarction by showing areas of decreased resting MeSH: D Myocardial perfusion single photon emission-computed tomography (MPS) has been one of the most important and common non-invasive diagnostic cardiac test. (monclerdonna.biz)
  • Computed tomography (CT) has emerged as a new imaging method for the diagnosis and evaluation of cardiovascular disease. (annals.org)
  • The objective of the proposed research is to merge the unique capabilities of computed tomography (CT) and real-time ultrasound (US) to provide a gating signal in order to obtain motion-free CT images of coronary arteries. (grantome.com)
  • LV dyssynchrony as assessed by phase analysis of gated SPECT myocardial perfusion imaging in patients with Wolff-Parkinson-White syndrome. (biomedsearch.com)
  • This method was applied to 25 Technetium (Tc)-99m-macroaggregated albumin (MAA) perfusion SPECT images, and motion analysis results were compared with the diagnostic results. (springer.com)
  • Cardiac magnetic resonance imaging (CMR) is the sole imaging modality with the ability, in 3 dimensions, to assess cardiac morphology, ventricular function, perfusion, viability and imaging characteristics of the surrounding vasculature without ionizing radiation. (appliedradiology.com)
  • There are 2 major techniques for MR perfusion imaging: First-pass contrast agent techniques and arterial spin labeling (ASL) techniques. (appliedradiology.com)
  • Two-dimensional (2D) T1-weighted ultrashort repetition time (TR) (approximately 6 msec) and echo time (TE) MRI with contrast agent forms the basis of pulmonary perfusion imaging. (appliedradiology.com)
  • This reflects tissue perfusion and forms the basis of echoplanar imaging signal targeting with alternating frequency (EPISTAR) (Figure 2). (appliedradiology.com)
  • Spin-labeling techniques are inherently sensitive to changes in both perfusion as well as blood volume, and high-resolution perfusion maps of the lungs can be obtained. (appliedradiology.com)
  • They obviate the need for exogenous contrast agent administration and have the advantage of providing perfusion quantification, because temporal image degradation seen with MRA is not seen. (appliedradiology.com)
  • 7 ASL perfusion maps, however, are not entirely accurate, as water molecules are labeled outside the imaging slice, and there is signal loss during the transit time between labeling and imaging. (appliedradiology.com)
  • As noted in American Medical Association, CPT-4 2007, myocardial perfusion and cardiac blood pool imaging studies may be performed at rest and/or during stress. (aapc.com)
  • is the most used imaging technique in cardiology, and it is continuously developing in the area of perfusion (2). (escardio.org)
  • Thus, limited availability of flow/function technology (echo provides mostly function and nuclear medicine perfusion), education (imaging specialist), diffusion (only major hospitals have nuclear medicine departments) and management (echocardiography belongs to cardiology, nuclear cardiology to nuclear medicine) influences the choice of the imaging technique. (escardio.org)
  • The purpose of this study was to determine how frequently and for what reasons the addition of electrocardiographically gated technetium-99m (Tc-99m) sestamibi single-photon emission computed tomographic (SPECT) images add value to nongated SPECT perfusion images. (onlinejacc.org)
  • The addition of electrocardiographically gated Tc-99m sestamibi SPECT images to the reading of stress and rest perfusion images alone resulted in shifting the final scan interpretations to a more normal designation in patients with a low pretest likelihood of coronary artery disease, and to more abnormal defects consistent with coronary artery disease in patients with known coronary artery disease. (onlinejacc.org)
  • The number of "borderline normal" and "borderline abnormal" interpretations are significantly reduced when gated SPECT images are interpreted simultaneously with stress and rest perfusion images. (onlinejacc.org)
  • Gated SPECT images can also assist in evaluating the significance of questionable perfusion defects [12] . (onlinejacc.org)
  • This study describes an automated approach for motion and deformation tracking of functional myocardial perfusion images . (psu.edu)
  • Developments in high-field technology and the advent of fast imaging sequences have resulted in cardiac MRI emerging as the new reference modality for assessments of myocardial function, perfusion and viability imaging in ischemic and nonischemic cardiomyopathies, assessment of cardiac tumors (Figure 3), and evaluation of complex congenital heart disease prior to and after surgery. (diagnosticimaging.com)
  • Gated SPECT MPI (myocardial perfusion imaging) is a method, which helps a physician to dynamically study the wall motion of a patient s heart ( Sciagra and Leoncini, 2005 ). (scialert.net)
  • All patients underwent echocardiography and those found to have LVSD underwent myocardial perfusion imaging with or without coronary angiography to diagnose underlying coronary artery disease (CAD). (bmj.com)
  • Gated radionuclide myocardial perfusion imaging is an established technique for the assessment of LVAS using the phase analysis technique of gated myocardial perfusion images. (springer.com)
  • 8 Most of the data on LVAS comes from gated SPECT but a similar approach has been applied to gated PET perfusion imaging and the LVAS cut-offs for a normal population have been previously reported. (springer.com)
  • 4 , 10 A few studies have evaluated LVAS in relation to ischemia on stress perfusion imaging. (springer.com)
  • Jan 01, · Radionuclide myocardial perfusion imaging is an established and non-invasive imaging technique with diagnostic and prognostic efficacy in the investigation of coronary artery disease. (monclerdonna.biz)
  • Procedure Guideline for Myocardial Perfusion Imaging * H. William Strauss 1, D. Douglas Miller 2, Mark D. Wittry 2, Manuel D. Cerqueira 3, Ernest V. Garcia 4. (monclerdonna.biz)
  • Aug 21, · Since the publication of the European Association of Nuclear Medicine (EANM) procedural guidelines for radionuclide myocardial perfusion imaging (MPI) in , many small and some larger steps of progress have been made, improving MPI procedures. (monclerdonna.biz)
  • This scan consists of two phases (stress and rest), in which images of the myocardium are acquired and the patient needs to be in the same position (in dorsal decubitus with the arms in hyperextension above the head), an average of 10 to Jan 01, · Radionuclide myocardial perfusion imaging is an established and non-invasive imaging technique with diagnostic and prognostic efficacy in the investigation of coronary artery disease. (monclerdonna.biz)
  • It is the only widely available test for assessing myocardial perfusion directly, but there are variations in the way it is performed in different monclerdonna.biz by: EANM procedural guidelines for radionuclide myocardial perfusion imaging with regadenoson can be administered intravenously by manual injection. (monclerdonna.biz)
  • Myocardial perfusion scintigraphy (MPS) produces images of regional tracer uptake in Patients with persistent symptoms after revascularization procedures. (monclerdonna.biz)
  • New techniques are also being developed which allow first pass perfusion imaging of the heart. (imaginis.com)
  • F. Appreciate the competing modalities for detection of chronic ischemic heart disease including myocardial perfusion scintigraphy, stress echo, stress MRI, cardiac CT, exercise ECG and PET. (nasci.org)
  • Dual phase infusion with bolus tracking: technical innovation for cardiac and respiratory navigated magnetic resonance angiography using extracellular contrast. (sickkids.ca)
  • BACKGROUND Magnetic resonance coronary angiography is challenging because of the motion of the vessels during cardiac contraction and respiration. (bmj.com)
  • METHODS 32 patients referred for elective coronary angiography were studied with a retrospective respiratory gated three dimensional gradient echo MRI technique. (bmj.com)
  • To perform a systematic review and meta-analysis of the diagnostic value of prospective ECG-gating coronary CT angiography in the diagnosis of coronary artery disease. (nih.gov)
  • A search of biomedical databases for English literature was performed to identify studies investigating the diagnostic value of 64- or more slice CT angiography with use of prospective ECG-gating in the diagnosis of coronary artery disease. (nih.gov)
  • Pooled estimates and 95% confidence interval (CI) of sensitivity, specificity, positive and negative predictive value of prospective ECG-gating coronary CT angiography for diagnosis of significant coronary stenosis were 99% (95% CI: 98, 100%), 91% (95% CI: 88, 94%), 94% (95% CI: 91, 96%) and 99% (95% CI: 97, 100%), according to the patient-based assessment. (nih.gov)
  • The mean effective dose was 3.3 mSv (95% CI: 2.3, 4.1 mSv) for the prospective ECG-gating coronary CT angiography. (nih.gov)
  • This analysis shows that for a predominantly male population with a high disease prevalence the use of coronary CT angiography with prospective ECG gating allows for a reduced radiation exposure without a sacrifice in diagnostic efficacy. (nih.gov)
  • In this report we discuss the measurement of radiation and the dosimetry of commonly performed cardiac diagnostic imaging tests, including nuclear scintigraphy, CT for calcium scoring and coronary angiography (CTCA), and conventional coronary angiography (CCA). (ahajournals.org)
  • MRA (magnetic resonance angiography) can produce 3D and 4D images of blood vessels and the flow of blood through the vessels. (wikipedia.org)
  • As such, cardiac CT coronary artery calcium (CAC) detection and coronary CT angiography (CTA) are well positioned to identify these 2 groups of individuals. (appliedradiology.com)
  • Additionally, CT should not be performed if evidence suggests that diagnostic images would be difficult to obtain in a particular patient (eg, CT coronary angiography in a patient with an irregular heart rhythm or a heavy coronary calcium burden or with an irregular heart rhythm). (appliedradiology.com)
  • The phantom was imaged on a dual-source CT system applying a retrospective gated coronary CT angiography (CCTA) protocol using synthesized motion-synchronized electrocardiogram (ECG) waveforms. (spiedigitallibrary.org)
  • Three-dimensional rotational coronary angiography (3DRCA) is a new technique for imaging coronary vessels in the human body. (spie.org)
  • To investigate the effects of prospective cardiac gating and low kilovoltage parameters on image quality and radiation dose when acquiring CT angiography of the thoracic aorta (CTTA). (biomedcentral.com)
  • In 49 patients with a previous infarction or recent angiography with ≥70% stenosis, or both, the addition of gated images changed the percentage of "abnormal" scan interpretations from 78% (38 of 49) to 92% (45 of 49). (onlinejacc.org)
  • MR angiography images (Figures 2 and 3) showed an anomalous vertically oriented venous structure which drained the right upper, middle and lower lobe pulmonary veins into the inferior vena cava. (diagnosticimaging.com)
  • By using MR angiography, cine-MR and velocity-encoded cine (VEC-MR) sequences, MRI represents the main non-invasive imaging technique to provide a complete anatomical assessment and shunt quantification. (diagnosticimaging.com)
  • ECG- gated CT angiography may be an alternative imaging technique to identify and characterize the connection of the anomalous pulmonary vein. (diagnosticimaging.com)
  • The aim of study is to comparison of two reconstructive methods using different filters to study the five cardiac wall motions via Gated single photon emission computerized tomography imaging was done through Gated SPECT (with a two-day protocol) and quantitative coronary angiography (QCA) on 25 patients (16 males, 9 females, mean ages, 54.08 year). (scialert.net)
  • Address correspondence to Y. Kim AJR 2005;184: X/05/ American Roentgen Ray Society Improvement of Image Quality with ß-Blocker Premedication on ECG-Gated 16-MDCT Coronary Angiography OBJECTIVE. (healthdocbox.com)
  • The objective of our study was to assess the effect of β-blockers on image quality of ECG-gated 16-MDCT coronary angiography. (healthdocbox.com)
  • Reduction of heart rates with β-blocker premedication improves the image quality of CT coronary angiography, especially in terms of the visualization of the right coronary artery. (healthdocbox.com)
  • 4] found that the best vessel visibility was obtained in patients with a heart rate of less than 65 beats per minute (bpm) using a single-phase image reconstruction and 4-MDCT, and they advised that heart rates be lowered before MDCT coronary angiography. (healthdocbox.com)
  • Therefore, we investigated whether image quality would improve on CT coronary angiography with the routine administration of an oral β-blocker before 16- MDCT. (healthdocbox.com)
  • However, cardiac MR applications appear to be very promising and may provide an excellent means to diagnose a number of heart conditions without requiring the use of x-rays or contrast injection, as with conventional x-ray angiography. (imaginis.com)
  • In some cases, ECG gated fast/multi-slice CT eliminates the need for conventional cardiac angiography which requires invasive catheterization. (imaginis.com)
  • Conventional cardiac catheter angiography. (renalandurologynews.com)
  • This technique is called prospective gating with retrospective reconstruction. (scmr.org)
  • The following examples show the difference in image quality between retrospective and prospective reconstruction (Movie 1 and 2 respectively). (scmr.org)
  • Compared to the image acquired by retrospective reconstruction, the prospectively reconstructed image demonstrates no image blurring, improved blood endocardial border definition and improved visualization of the valves and trabeculations. (scmr.org)
  • More examples of standard SSFP images comparing the retrospective vs. prospective reconstruction are shown below demonstrating the improved resolution of the aortic valve leaflets (Movie 5 vs. Movie 6). (scmr.org)
  • Technical procedures: Previously, ECG gating has fundamentally been retrospective gating with which information are gathered over the whole cardiac cycle. (bartleby.com)
  • Additionally, the more up to date prospective triggering technique gathers CT information just at a specified point or cluster of points in the heart cycle, decreasing the time the CT beam is on to a fraction of what it was with retrospective gating, thus considerably decreasing the radiation dose (Shuman et al. (bartleby.com)
  • One group of thirty were examined with retrospective gating and standard parameters (120 kV, 340 mAs). (biomedcentral.com)
  • Retrospective gating, plane/diverging wave imaging, and multiline transmit imaging all improve the temporal resolution of the conventional ultrasound system. (onlinejacc.org)
  • Recently, several technical advances have shown that 2D ultrasound imaging at a very high temporal resolution becomes possible through retrospective gating, plane wave/diverging wave imaging, and multiline transmit systems. (onlinejacc.org)
  • Retrospective gating is essential for if mitral or tricuspid valve function is assessed. (radiopaedia.org)
  • The aim of this study was to demonstrate the feasibility of CINE fetal MRI within a breath-hold with self-gated retrospective binning applied with continuous golden angle radial sampling and iGRASP acceleration. (ismrm.org)
  • Secondly, we used a real-time processing approach ( Fig. 2a ) to trigger stabilized image extraction at appropriate phases of the respiratory and cardiac cycles using a retrospective electrocardiogram (ECG)-gating technique 15 . (pubmedcentralcanada.ca)
  • DCT with retrospective ECG gating and IV injection of contrast M agent has recently been introduced as a method for the noninvasive visualization of coronary artery stenoses [1 5]. (healthdocbox.com)
  • The past five years has witnessed unprecedented advances in ED reduction, with individualised protocol selection, retrospective tube dose modulation, bismuth breast shields 7 and low-dose prospective axial electrocardiogram (ECG)-triggered gated image acquisition. (bjcardio.co.uk)
  • Cardiac MRI with administration of IV contrast is the first-line imaging technique for optimal characterization and definition of cardiac masses already visualized by 2D echocardiography. (psychiatryadvisor.com)
  • [ 1 ] or by performing imaging with 2-dimensional (2-D) echocardiography or magnetic resonance imaging (MRI). (medscape.com)
  • The noninvasive cardiac echocardiography (US) allows the measurement of the pulmonary artery dimensions, the right ventriculare shape, the ejection fraction, and the noninvasive estimation of the systolic pulmonary artery pressure [ 15 - 18 ], but the applicability of US in patients affected by COPD is limited because of the reduced acoustic window [ 15 ], due to pulmonary hyperinflation. (hindawi.com)
  • Power pulse inversion, power modulation or coherent imaging represents the state of the art of real time contrast echocardiography, with the intrinsic limitations of bi-dimensional imaging (it generates artefacts and does not provide the same accuracy in all myocardial segments). (escardio.org)
  • Inclusion criteria were (1) presurgical echocardiography, magnetic resonance imaging, and cardiac catheterization and (2) clinical follow-up information. (stanford.edu)
  • The top three modalities used by cardiologists to diagnose cardiac disease are echocardiography, SPECT, and cardiac catheterization. (diagnosticimaging.com)
  • Echocardiography is a non-invasive exam in which images are acquired and viewed in real time without the use of radiation. (imaginis.com)
  • In general, the clinical reasons for a CMR examination fall into one or more of the following categories: 1) when transthoracic echocardiography is incapable of providing the required diagnostic information, 2) when clinical assessment and other diagnostic tests are inconsistent, 3) as an alternative to diagnostic cardiac catheterization with its associated risks and higher cost and 4) to obtain diagnostic information for which CMR offers unique advantages. (ijri.org)
  • As with echocardiography and cardiac catheterization, CMR is an interactive diagnostic procedure that requires on-line review and interpretation of the data by the supervising physician. (ijri.org)
  • Cardiac ultrasound, also known as echocardiography, concerns the ultrasound imaging of the heart. (stjameshospital.com)
  • Although current cardiac monitoring with multi gated acquisition (MUGA) scanning and/or conventional 2D-echocardiography (2DE) have a high availability, their reproducibility are modest, and more sensitive and reliable techniques are needed such as 3D-echocardiography (3DE) and speckle tracking echocardiography (STE). But which other diagnostic imaging modalities are available for patients before and during trastuzumab treatment? (her2support.org)
  • Echocardiography is referred to as cardiac echo produced by the ultrasound waves which in turn create the images of the heart. (cardiologymeeting.com)
  • Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts. (sickkids.ca)
  • Respiratory gating, turboflash acquisition, and volume rendering techniques may meet the necessary requirements for appropriate visualisation. (bmj.com)
  • The complex course of the coronary anatomy can be evaluated with two dimensional (2D) or preferably three dimensional (3D) acquisition techniques. (bmj.com)
  • This can be described by: S N R v = π 2 v v e n c S N R {\displaystyle SNR_{v}={\frac {\pi }{\sqrt {2}}}{\frac {v}{v_{enc}}}SNR} where S N R {\displaystyle SNR} is the signal-to-noise ratio of the image (which depends on the magnetic field of the scanner, the voxel volume, and the acquisition time of the scan). (wikipedia.org)
  • The DEPC method does not only allow for proper velocity quantification, but also reduces the total acquisition time (especially when applied to 4D flow imaging) compared to a single-echo single- v e n c {\displaystyle v_{enc}} PC-MRI acquisition carried out at two separate v e n c {\displaystyle v_{enc}} values. (wikipedia.org)
  • Echo-planar imaging is an MRI technique that reduces the time of data acquisition so as to reduce the movement of the patient during capturing. (wikipedia.org)
  • This review intends to introduce currently used 4D flow MRI methods, including Cartesian and radial data acquisition, approaches for accelerated data acquisition, cardiac gating, and respiration control. (nih.gov)
  • The effective temporal acquisition window was 160 ms. Postprocessing tools were used to separate the coronary arteries from the cardiac chamber blood pool. (ahajournals.org)
  • In order to minimize motion artifacts, cardiac gating is performed to synchronize image acquisition with cardiac motion. (scmr.org)
  • The electrocardiogram and specifically the R wave are used to trigger image acquisition. (scmr.org)
  • In atrial fibrillation (AF), due to the varying R-R intervals, the phase acquisition is not consistent between each cardiac cycle. (scmr.org)
  • 2. Parallel imaging can be used which allows for shorter breath hold and faster image acquisition that could minimize the amount of variability acquired. (scmr.org)
  • We present a novel method of image acquisition in patients with AF that we have found to significantly improve motion artifact introduced by variable heart rate. (scmr.org)
  • 2,3 To reduce radiation dose without compromising image quality, cardiovascular imagers have developed and adopted several novel scan acquisition techniques and scan parameter modifications. (appliedradiology.com)
  • They further show the utility of the model to ascertain metrics of CCTA accuracy and image quality under realistic plaque, motion, and acquisition conditions. (spiedigitallibrary.org)
  • During SPECT data acquisition, a gamma camera is used to acquire multiple 2D images (also called projections), from multiple angles. (utah.edu)
  • It can be used in the development of new imaging instrumentation, image acquisition strategies, and image processing and reconstruction methods. (duke.edu)
  • MR flow imaging in vascular malformations using gradient recalled acquisition. (ajnr.org)
  • The main drawback of such high frame rate data acquisition is that it typically has reduced image quality. (onlinejacc.org)
  • However, for given clinical applications, the acquisition of temporally-resolved data might outweigh the reduction in image quality. (onlinejacc.org)
  • Traditional 2-dimensional (2D) echocardiographic imaging is on the basis of a temporal resolution of ∼25 to 40 Hz (i.e., data acquisition occurs every 25 to 40 ms), with later developments approximately doubling this. (onlinejacc.org)
  • gated magnetic resonance imaging a method for magnetic resonance imaging in which signal acquisition is gated to minimize motion or other artifacts. (thefreedictionary.com)
  • Cardiac gating or cardiac triggering refers to the gain of information about specific time points and its use for image acquisition during the cardiac cycle. (radiopaedia.org)
  • Data acquisition is carried out in a subsequent fashion after an estimation of the number of cardiac phases or segments within an R-R interval has been made. (radiopaedia.org)
  • The data acquisition is triggered by each R-wave and is stopped after the data of the estimated number of cardiac phases has been collected. (radiopaedia.org)
  • Cardiac gated imaging has enabled the acquisition of high resolution diagnostic quality cardiac images with conventional MRI. (ahrq.gov)
  • Signal averaging can be employed to increase the signal-to-noise ratio, but this extends the image acquisition times beyond 10 min per data set, which would make the protocols unsuitable for clinical routine. (scielo.br)
  • At 7 and 30 d after ligation, cardiac MRI was conducted by using pulse-oxymetry-gated cine acquisition to provide complete phases of the heartbeat. (biomedsearch.com)
  • Cardiac CEST imaging technique was optimized in the following aspects: (a) Images were acquired by single-shot FLASH instead of segmented acquisition, resulting in an imaging time of 4-5 min, depending on the navigator acceptance rate. (springer.com)
  • The image acquisition time (45 versus 68 min, p=0.002) and anaesthesia duration (100 versus 132 min, p=0.02) were shorter in the ferumoxytol group.CONCLUSION: Transient low blood pressure was common in children undergoing cardiac MRI with anaesthesia, but the incidence of hypotension did not differ between ferumoxytol and gadolinium groups. (stanford.edu)
  • Here, we present a new technique for imaging the beating murine heart at the single cell level, based on a novel stabilizer setup combined with a gating acquisition algorithm. (pubmedcentralcanada.ca)
  • Here, we present a new approach for real-time microscopic imaging, which involves a combination of motion stabilization and an algorithm for acquisition during advanced cardiopulmonary gating. (pubmedcentralcanada.ca)
  • Preferably, the cell size is sufficiently small that almost all cells of the detector count at most one particle during the image acquisition time. (google.ca)
  • The trend has been toward faster imaging sequences and the reduction of artifacts, while spectroscopy development has concentrated on localization techniques - reduction of the volume of interest (VOI), decreased contamination from areas outside the VOI, and increased speed of acquisition. (jci.org)
  • Solutions like respiratory gating, that synchronize the breathing cycle of the patient and the data acquisition process, or correlated dynamic PET techniques that use external radioactive markers and list mode data, have been tested with improvements over the spatial activity distribution in lungs lesions, but with the disadvantages of requiring extra hardware or more expensive scanner systems. (inria.fr)
  • The objective of this study was to incorporate breathing-movement corrections directly to the phase of image reconstruction, without any additional acquisition protocol consideration. (inria.fr)
  • A highly-accelerated 2.5-minute sparse MR protocol was developed for a continuous acquisition of cardiac images through multiple cardiac and respiratory cycles. (nature.com)
  • This examination would require the intravenous injection of a contrast medium and a specialise ECG gated acquisition technique where the patient is connected to an ECG unit. (stjameshospital.com)
  • 8,9 More recently, the rebirth of iterative reconstruction (IR) techniques has been heralded as another significant development for cardiac CT image acquisition. (bjcardio.co.uk)
  • OBJECTIVE To determine the diagnostic accuracy of respiratory gated magnetic resonance imaging (MRI) for the detection of significant coronary artery stenoses evaluated with three dimensional postprocessing software. (bmj.com)
  • In this study we determined the diagnostic accuracy of respiratory gated 3D-MRCA for the detection of coronary artery stenoses evaluated with a volume rendering technique. (bmj.com)
  • The volume of cardiac diagnostic procedures involving the use of ionizing radiation has increased rapidly in recent years. (ahajournals.org)
  • Thus, physicians ordering and performing cardiac imaging should be very familiar with the dosage of radiation from cardiac diagnostic tests and ways in which dose can be minimized. (ahajournals.org)
  • Imaging of the coronary arteries, for example, can be limited to diastole without a diagnostic penalty. (ahajournals.org)
  • As the nuclei return from excitation to the equilibrium state, a signal induced in the receiver coil of the instrument by the nuclear magnetization can then be transformed by a series of algorithms into diagnostic images. (nih.gov)
  • This results in image blurring and often non-diagnostic images. (scmr.org)
  • Cardiac CT should be performed only when the benefits of the scan outweigh both the risks of the imparted radiation and when similar diagnostic information cannot be obtained from a different imaging modality that does not expose the patient to ionizing radiation. (appliedradiology.com)
  • imag·ing/ ( im´ah-jing ) the production of diagnostic images, e.g., radiography, ultrasonography, or scintillation photography. (thefreedictionary.com)
  • In the recent years, with the development of ultrafast sequences, magnetic resonance imaging (MRI) has been established as a valuable diagnostic modality in body imaging. (scielo.br)
  • 2 Both modalities have progressed from being novel research techniques to routine diagnostic tools. (diagnosticimaging.com)
  • A large number of publications have shown that the diagnostic performance of cardiac CT compares well with that of catheterization. (diagnosticimaging.com)
  • This will further benefit the diagnostic accuracy of cardiac diseases by PET studies. (healthimaging.com)
  • Photoacoustic imaging promises to open new windows for basic science and diagnostic medicine, and may have important implications for the future of medical discovery. (uwm.edu)
  • This diagnostic technique is an excellent tool to provide details of the cardiac structures â€" vessels, valves, and muscle. (imaginis.com)
  • In clinical practice, CMR is typically ordered after other imaging studies have been performed and additional diagnostic information is required. (ijri.org)
  • Outcome measures included image noise, diagnostic image quality and radiation exposure. (bjcardio.co.uk)
  • More broadly, the potential impact of this US-based gating technique is that it can be applied directly to other diagnostic problems including respiratory gating for positron-emission tomography-CT and radiation therapy. (grantome.com)
  • This is followed by taking the Inverse Fourier transform for reconstruction of the image, which can contain ghosting artifacts. (wikipedia.org)
  • Although bismuth shielding has been found to reduce radiation dose to the breast by 29% to 57%, 6,7 such shielding is also associated with degradation of image quality because of increased pixel attenuation values from beam-hardening effects, higher levels of image noise, streak artifacts, and internally scattered radiation. (appliedradiology.com)
  • The small cord size has inherent low SNR of the diffusion signal intensity, respiratory and cardiac movements induce artifacts, and EPI sequences used for obtaining diffusion indices cause eddy-current distortions. (ajnr.org)
  • Motion artifact suppression technique (MAST) for cranial MR imaging: superiority over cardiac gating for reducing phase-shift artifacts. (ajnr.org)
  • Cardiac gating leads to less artifacts and more accurate measurements of the thoracic aorta and root. (biomedcentral.com)
  • 24 studies contained information of the differences in gated and ungated MR images regarding artifacts, distortions and signal loss. (ahrq.gov)
  • Demonstrated that MR images were enhanced by elimination of movement artifacts that cause degradation of the signal and associated blurring. (ahrq.gov)
  • Gating techniques eliminate or reduce movement artifacts causing degradation of the RF signal and associated blurring of the image. (ahrq.gov)
  • Gating enhances the quality of MR images of structures that are not stationary by reducing motion artifacts and improving temporal resolution. (ahrq.gov)
  • Limited signal intensity is caused by low proton density, susceptibility artifacts are due to differences between tissue and air, besides physiological motion (cardiac pulsation, respiration). (scielo.br)
  • Electrocardiographic gating of Tc-99m sestamibi SPECT images permits assessment of regional and global left ventricular function and may assist in differentiating attenuation artifacts from myocardial scar. (onlinejacc.org)
  • Beam hardening artifacts from dental fillings often plague CT examinations, but dental fillings cause only minimal susceptibility artifacts with MR. Non-removable bridgework remain a problem for both techniques. (ucsd.edu)
  • Ultrasonic imaging, on the contrary, provides good image resolution in deep tissues but has strong speckle artifacts as well as poor contrast in early-stage tumors. (uwm.edu)
  • In such cases, images of subjects with high heart rates often render coronary segments unassessable, and coronary arteries are frequently affected by motion artifacts [1 3]. (healthdocbox.com)
  • and (iii) its robustness on studies with pathological abnormalities or imaging artifacts. (ovid.com)
  • To overcome this procedure's risks and to reduce the associated high costs, real- time ultrasound could be used as a gating signal to drastically reduce motion artifacts in cardiac computerized tomography. (grantome.com)
  • Ultra High Frequency ultrasound, using the Vevo Imaging Systems, will have an incredible impact on cardiovascular research in your animal models. (visualsonics.com)
  • Vevo ultrasound imaging platforms provide the best temporal and spatial resolution compared to MRI, conventional ultrasound and CT. (visualsonics.com)
  • Learn how gated volumetric murine ultrasound (4D) can provide unique information. (visualsonics.com)
  • 2. The ultrasound imaging system of claim 1 wherein the beamforming circuit comprises a programmable apodized delay line. (google.com)
  • 3. The ultrasound imaging system of claim 1 further comprising a transmit/receive circuit in communication with selectable transducer array elements. (google.com)
  • Imaging techniques, such as intravascular ultrasound (IVUS) and optical coherence tomography (OCT), provide detailed visualization of luminal and plaque morphology and reliable quantification of the atheroma burden and its composition [ 5 ]. (hindawi.com)
  • Several recent technical advances in cardiac ultrasound allow data to be acquired at a very high frame rate. (onlinejacc.org)
  • It is the aim of this paper to provide an overview of the technical principles behind these new ultrasound imaging modalities, to review the current evidence of their potential clinical added value, and to forecast how they might influence daily clinical practice. (onlinejacc.org)
  • Cardiac ultrasound is the modality of choice for routine diagnostics given its low cost, high accessibility, and lack of ionizing radiation. (onlinejacc.org)
  • Ultrasound imaging is based on the acoustic pulse-echo measurement: an ultrasound pulse is transmitted and echo signals are subsequently received. (onlinejacc.org)
  • One image line is thus reconstructed for each ultrasound pulse transmitted. (onlinejacc.org)
  • Combining Light and Sound: Can Ultrasound Become the Preferred Modality for Functional and Molecular Imaging? (uwm.edu)
  • Ultrasound imaging is widely used in medical diagnostics. (uwm.edu)
  • In this seminar, I will present how combining optics and ultrasound elevates the imaging in two major aspects: increasing resolution by forming high density transducer arrays and providing functional and molecular sensitivity by interaction with optical contrast agents. (uwm.edu)
  • This alternative ultrasound technology enables high density packing of ultrasonic transducer elements in a small area, exhibiting high bandwidth operation for high resolution 3D imaging. (uwm.edu)
  • The technique combines optical contrast with the high resolution of ultrasound for deep tissue imaging. (uwm.edu)
  • Two non-invasive ultrasound based imaging methods, SAD-SWEI and SAD-Gated Imaging, were developed that measure ARF-induced on-axis tissue displacements, off-axis transverse wave velocities, and WSR throughout the cardiac cycle. (spie.org)
  • Breast ultrasound tomography is a rapidly developing imaging modality that has the potential to impact breast cancer screening and diagnosis. (spie.org)
  • Conventional ultrasound techniques use beam-formed, constant sound speed ray models for fast image reconstruction. (spie.org)
  • However, these techniques are inadequate for the emerging new field of ultrasound tomography (UST). (spie.org)
  • We have extended the planar Kirchhoff migration method used in geophysics, and combined it with sound speed and attenuation data obtained from the transmission signals to create reflection ultrasound images that are corrected for refractive and attenuative effects. (spie.org)
  • A promising candidate for improved imaging of breast cancer is ultrasound computer tomography (USCT). (spie.org)
  • C. Understand the imaging risk markers for atheromatous disease, notably coronary calcium score on CT and intimo-medial thickness on carotid ultrasound. (nasci.org)
  • Multidimensional fetal flow imaging with cardiovascular magnetic resonance: a feasibility study. (sickkids.ca)
  • The editor of Images in Cardiovascular Medicine is Hugh A. McAllister, Jr, MD, Chief, Department of Pathology, St Luke's Episcopal Hospital and Texas Heart Institute, and Clinical Professor of Pathology, University of Texas Medical School and Baylor College of Medicine. (ahajournals.org)
  • Circulation encourages readers to submit cardiovascular images to the Circulation Editorial Office, St Luke's Episcopal Hospital/Texas Heart Institute, 6720 Bertner Ave, MC1-267, Houston, TX 77030. (ahajournals.org)
  • Cardiovascular magnetic resonance imaging (CMR), sometimes known as cardiac MRI , is a medical imaging technology for the non-invasive assessment of the function and structure of the cardiovascular system . (wikipedia.org)
  • It is derived from and based on the same basic principles as magnetic resonance imaging (MRI) but with optimization for use in the cardiovascular system. (wikipedia.org)
  • By combining a variety of such techniques into protocols, key functional and morphological features of the cardiovascular system can be assessed. (wikipedia.org)
  • At Duke University, Durham, NC, he completed his Internal Medicine Residency in 2004 and his Cardiovascular Magnetic Resonance Imaging Fellowship in 2005. (appliedradiology.com)
  • Consequently, there is an impetus to develop improved noninvasive imaging modalities to better detect coronary artery disease (CAD) and determine the prognosis of future cardiovascular events. (appliedradiology.com)
  • Cardiovascular MR measurements of left ventricular (LV)function (Figure 2),are usually obtained from a series of ECG-gated SSFPimages obtained in the short axis view. (appliedradiology.com)
  • Recent advances in cardiovascular MRI (CMR) technologies such as T1-mapping or extracellular volume (ECV) fraction (derived from T1-mapping) offer robust techniques to assess diffuse fibrosis in patients with myocardial infarction and heart failure. (ismrm.org)
  • Clinical implementation of these techniques will have a major impact on both diagnostics and imaging assisted therapy of cardiovascular diseases and cancer. (uwm.edu)
  • Despite the considerably more frequent use of cardiovascular MR (CMR) imaging compared with CMR spectroscopy, currently, there is significant clinical information to be ascertained from molecules in the myocardium that can be detected by clinical spectroscopy. (jci.org)
  • Current cardiovascular magnetic resonance (CMR) T1 mapping techniques such as Modified Look-Locker inversion recovery (MOLLI) imaging have limited resolution, but accelerated and navigator-gated Look-Locker imaging for cardiac T1 estimation (ANGIE) is a novel CMR sequence with spatial resolution suitable for T1 mapping of the RV. (biomedcentral.com)
  • With CT body scanners and contrast enhancement, evaluation of aortic dissections and aneurysms, coronary bypass graft patency, cardiovascular thrombus, cardiac tumors, and pericardial disease is possible. (annals.org)
  • Electrocardiographic gating retrospectively or prospectively improves the image resolution of CT scans, but a new ultrafast CT scanner with a scan time of 30 to 50 milliseconds offers the greatest promise for expanding the application of the technology for cardiovascular diagnosis. (annals.org)
  • Dr. Wright was appointed the Canada Research Chair in Imaging for Cardiovascular Therapeutics in 2010. (utoronto.ca)
  • The research focus of Dr. Wright's group is cardiovascular imaging, with an emphasis on MRI. (utoronto.ca)
  • This K-23 proposal describes a multidisciplinary, cross-cutting career development program, which will enable the Principal Investigator, a Cardiothoracic and Abdominal Radiologist, and an Electrical Engineer, to become a productive independent translational researcher in cardiovascular imaging. (grantome.com)
  • Finally, a clinical research component that involves gathering and analyzing US, ECG and CT data will be performed under the mentorship of internationally recognized pioneers in cardiovascular imaging from the Departments of Radiology and Cardiology at Emory University. (grantome.com)
  • Magnetic resonance imaging (MRI) is a truly non-invasive technique which is not associated with radiation and is nowadays available for clinical use. (bmj.com)
  • Despite the difficulties and known limitations, several image segmentation approaches have been proposed and used in the clinical setting including thresholding, edge detection, region growing, clustering, stochastic models, deformable models, classifiers and several other approaches. (springer.com)
  • Each year, approximately 1.8 million Americans will experience an acute myocardial infarction (AMI), or sudden cardiac death will be their first clinical manifestation of CAD. (appliedradiology.com)
  • The purpose of this article is to review the technical aspects and briefly describe the role of pulmonary MRI in clinical imaging. (appliedradiology.com)
  • Scientific evaluation of the safety and clinical effectiveness of surface and other specialty coil devices and gating techniques in conjunction with MRI procedures. (ahrq.gov)
  • Because of improvements in speed and image quality, MRI is now ready for routine clinical use also in the study of pulmonary diseases. (scielo.br)
  • Several imaging techniques may provide the integrated flow/function information, but their degree of certainty varies as well as their impact on clinical decision-making. (escardio.org)
  • There has been much recent interest in obtaining matched information by a single technique in clinical cardiology. (escardio.org)
  • Additional technical developments should increase the clinical value of cardiac CT and MRI still further. (diagnosticimaging.com)
  • Clinical assessment prompted a chest radiograph and subsequent cross-sectional imaging. (eurorad.org)
  • Depending on clinical correlation, further cross-sectional & functional-imaging (CT, Cardiac-MR/ECHO) are necessary for diagnosis along with assessment of size/content of aneurysm (thrombus) along with evaluating cardiac functions [5]. (eurorad.org)
  • Supposedly to avoid confusion with nuclear medicine, the clinical NMR imaging tool became known as magnetic resonance imaging (MRI) in the late 1970s. (jci.org)
  • There are many approaches available, related to the sequence of radiofrequency pulses and magnetic field gradients, for the generation of clinical images and spectra by NMR. (jci.org)
  • A comparison and summary of some common clinical imaging sequences is provided in Table 1 . (jci.org)
  • The clinical application of cardiac NMR spectroscopy requires localization of the observed signals to the in situ myocardium to avoid contamination from adjacent tissues. (jci.org)
  • Although the bulk of clinical myocardial spectroscopy has been applied to the evaluation of the metabolites that contain phosphorus, these techniques are applicable to other NMR-visible nuclei, including hydrogen, carbon-13, fluorine-19, and sodium-23. (jci.org)
  • ANGIE RV imaging merits further clinical evaluation in PH. (biomedcentral.com)
  • This manuscript will focus on several congenital heart diseases commonly referred for CMR evaluation and review their clinical aspects, goals of the MRI evaluation, imaging protocol and current literature. (ijri.org)
  • Over the past three decades cardiac magnetic resonance imaging (CMR) has evolved from a technique with promise to one that is integrated into the clinical management of individuals with congenital heart disease (CHD). (ijri.org)
  • On one hand, breath-hold cardiac cine acquisitions are routinely used in daily clinical protocols. (nature.com)
  • I have had numerous clinical collaborations most notably in functional neuro-imaging and in respiratory medicine. (edu.au)
  • The translational component involves a didactic component, provided by Emory University's Master of Science in Clinical Research program and an Imaging Clinical Trials workshop offered by the Radiological Society of North America. (grantome.com)
  • The program would take place in an environment which is at the cutting edge of medical imaging, cardiology, and biomedical engineering, with extensive clinical, educational and research resources. (grantome.com)
  • To determine the potential of directional diffusivities from diffusion tensor imaging (DTI) to predict clinical outcome of optic neuritis (ON), and correlate with vision, optical coherence tomography (OCT), and visual evoked potentials (VEP). (neurology.org)
  • Pathologic heterogeneity is postulated as a key contributor to the MRI paradox in multiple sclerosis (MS). An imaging modality that better correlates with clinical disability and prognosis is needed. (neurology.org)
  • The objectives of the following research were to evaluate the utility of a deformable image registration technique known as hyperelastic warping for the measurement of local strains in the left ventricle through the analysis of clinical, gated PET image datasets. (ebscohost.com)
  • Ghosting is a visual artifact that occurs in magnetic resonance imaging (MRI) scan. (wikipedia.org)
  • Ghosting is a multidimensional artifact that occurs in the MRI in the phase encoded direction (short axis of the image) after applying the Fourier transform. (wikipedia.org)
  • Beta-blocker administration is often helpful in cardiac CT scanning to lower the heart rate and decrease motion artifact. (medscape.com)
  • Stairstep artifact: Volume-rendered CT image demonstrates "stairstep" artifact. (medscape.com)
  • However, the faster and slower cycles will still add artifact to the images. (scmr.org)
  • Without gating the aortic root and ascending aorta are particularly prone to artifact. (biomedcentral.com)
  • Subject to motion and susceptibility weighted artifact, thus degrading imaging quality. (infectiousdiseaseadvisor.com)
  • Artifact suppression techniques such as flow compensation, cardiac gating, presaturation pulses, gradient moment nulling, no phase wrap can improve image quality. (ucsd.edu)
  • The supervising physician needs to serially review the image quality, assess the degree of metallic device related artifact, ensure that anatomic coverage is adequate, screen for aliasing of velocity encoded cine (VEC) MRI flow data and check for motion related artifact from poor electrocardiographic (ECG)-gating or respiratory motion. (ijri.org)
  • May be subject to motion and susceptibility weighted image artifact. (renalandurologynews.com)
  • Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchronizer or gating device. (bioportfolio.com)
  • One way the current approach can be improved is by the use of noninvasive imaging modalities that, ideally, can be applied to both asymptomatic and symptomatic persons. (appliedradiology.com)
  • With the exception of cardiac CT, no single noninvasive imaging technology currently detects both subclinical atherosclerosis and flow-limiting CAD. (appliedradiology.com)
  • According to whether or not the body has to be injured during detection of a lesion, the imaging techniques for detection and quantitative analysis of NCPs are classified into two categories: invasive methods and noninvasive methods [ 5 ]. (hindawi.com)
  • Although noninvasive imaging techniques have limitations, they can evaluate most lesions and preclude the need for cardiac catheterization. (aafp.org)
  • Noninvasive imaging is particularly useful for serial evaluation of patients with surgically corrected congenital heart disease, because nearly one half of these patients will require two or more surgeries. (aafp.org)
  • Because cardiac CT is noninvasive, morbidity associated with the procedure is substantially lower than that for catheterization. (diagnosticimaging.com)
  • Hasegawa B, Zaidi H. Dual-modality imaging: more than the sum of its components. (springer.com)
  • For each modality, we address the terminology and methodology used to quantify radiation received by patients, doses to patients with typical protocols, and dose-reduction techniques. (ahajournals.org)
  • Relatively inexpensive, portable imaging modality. (renalandurologynews.com)
  • My interests are in the development of quantitative techniques using imaging of in vivo radionuclide tracers and development of multi-modality imaging methodology. (edu.au)
  • The volume of procedures performed in cardiac catheterization labs increased from 2.45 million in 1993 to 3.85 million in 2002. (ahajournals.org)
  • 7 The ability of cardiac CT to evaluate the coronary arteries places it in direct competition with cardiac catheterization. (diagnosticimaging.com)
  • Due to the residual cardiac motion, projections being in the same cardiac motion state are extracted from the acquired series using electrocardiogram (ECG) information. (spie.org)
  • The improved image quality using prospective reconstruction is also seen in patients with AF but with low heart rate variability (Movie 3 and 4). (scmr.org)
  • The prospective reconstruction in AF patients has demonstrable utility not only in standard SSFP images but also in tagging (Movie 7). (scmr.org)
  • The data segments from the different R-R intervals are then interpolated onto an average length R-R interval which has been calculated during image reconstruction. (radiopaedia.org)
  • The images from these scans took 2.5 hours to be processed by algebraic reconstruction techniques on a large computer. (bionity.com)
  • A 4D PET imaging reconstruction technique may help improve image quality and reduce noise during cardiac-gated PET scans, according to research presented June 10 at the 59th annual meeting of the Society of Nuclear Medicine and Molecular Imaging (SNMMI) in Miami. (healthimaging.com)
  • Si Chen, PhD, Tsinghua University in Beijing, China, and colleagues developed the 4D PET reconstruction method that includes respiratory and cardiac motion compensation to understand its efficacy during cardiac PET scans. (healthimaging.com)
  • This newly developed 4D image reconstruction algorithm will improve the cardiac PET image quality--enhancing image resolution and reducing noise at the same time--which will make the interpretation of the images by physicians easier and of higher accuracy," Chen, a research scientist, said in an interview. (healthimaging.com)
  • But with the new algorithm, patient scan time or injected dose (or both) can be reduced to a certain extent but the image quality remains the same as that by the image reconstruction algorithm implemented in the current protocols. (healthimaging.com)
  • In emission tomography, the process of image reconstruction has evolved since the utilization of the filtered back projection algorithm (FBP). (inria.fr)
  • With 3.5 million of acquired raw data and up to one billion voxels for one image, the reconstruction of breast volumes may last for weeks in highest possible resolution. (spie.org)
  • The currently applied backprojection algorithm, based on the synthetic aperture focusing technique (SAFT), offers only limited potential for further decrease of the reconstruction time. (spie.org)
  • In this work an existing Bresenham concept to rasterize circles is extended to comply with the requirements of image reconstruction in USCT: the circle rasterization was adapted to rasterize spheres and extended to floating point parameterization. (spie.org)
  • We present a new technique for the reconstruction of reflection images from UST data. (spie.org)
  • This study was designed to evaluate the impact of a novel iterative reconstruction (IR) algorithm on an established UK cardiac computerised tomography (CT) service. (bjcardio.co.uk)
  • Image noise was measured within predefined regions of interest (ROI), and image quality qualitatively assessed by two clinicians blinded to the reconstruction method. (bjcardio.co.uk)
  • 10 IR algorithms create more accurate final images by performing repeated 'iterative' reconstruction cycles on image data, reducing the amount of electronic noise. (bjcardio.co.uk)
  • The CAPIR study (CT assessment of chest pain with iterative reconstruction) recruited patients that were enrolled in an ongoing current trial, the Cardiac CT for the Assessment of Pain and Plaque (CAPP) study [ISRCTN52480460]. (bjcardio.co.uk)
  • The reported effective radiation doses for retrospectively gated, single-source, 64-slice CT scanning have ranged from 9.5-21.4 mSv. (medscape.com)
  • F. Understand the implications in terms of dose of increasing the cranio-caudal field of view by "x" cm (e.g. 5 cm) in retrospectively gated cardiac CT. (nasci.org)
  • G. Understand the dose savings from retrospectively gated to prospectively triggered CT. (nasci.org)
  • In Aim 2, the PI will evaluate the efficacy of US-derived gating parameters relative to ECG-gating in generating motion-free CTCA from retrospectively-gated CT scans. (grantome.com)
  • One of the most difficult issues facing PET-based treatment planning is the accurate delineation of target regions from typical blurred and noisy functional images. (springer.com)
  • Functional cardiac MR imaging (CMR) requires high muscle/blood contrast, full coverage of the cardiac cycle and high temporal resolution. (bruker.com)
  • These preliminary observations indicate tomography as a suitable technique, being able to measure the pulsatility and the dimensions of the arteries and the right ventricular functional parameters. (hindawi.com)
  • PH is determined by both functional vasoconstriction and vessels remodeling [ 3 - 5 ] that determine the right ventricular afterload leading to effort intolerance, poor quality of life, cardiac failure, and reduced life expectancy. (hindawi.com)
  • Within the imaging methods, magnetic resonance imaging (MRI) is extensively studied and allows the measurement of both morphologic and functional data such as Puls and pulmonary blood flow [ 19 - 21 ], but it is not widely available. (hindawi.com)
  • Because SPECT permits accurate localization in 3D space, it can be used to provide information about localized function in internal organs, such as functional cardiac or brain imaging. (utah.edu)
  • Functional imaging studies have demonstrated that a much wider range of neural structures was involved in triggering disgust reactions. (spie.org)
  • Although these frame rates are adequate to assess cardiac morphology and certain functional aspects, they do not allow the resolution of all cardiac mechanical events, as some of them are very short-lived. (onlinejacc.org)
  • The main advantage of MRI of the lungs is its unique combination of morphological and functional assessment in a single imaging session. (scielo.br)
  • Furthermore, using a special algorithm, plenty of information can be obtained about cardiac functional parameters. (scialert.net)
  • Using optical contrast agents extends the scope of photoacoustic imaging to functional and molecular imaging. (uwm.edu)
  • Future research plan in this field includes developing a range of functional imaging agents such as: intra-cellular calcium dynamics, enzymatic activity and tissue oxygenation. (uwm.edu)
  • Although bio-optical imaging offers high contrast in visualizing both anatomical and functional information of biological tissues in vivo, bio-optical imaging suffers from short penetration depth due to strong optical scattering. (uwm.edu)
  • Moreover, based on multi-wavelength illumination, distributions of both endogenous pigments and exogenous contrast agents can be estimated to achieve functional imaging and molecular imaging. (uwm.edu)
  • Offers exquisite anatomical and functional imaging. (renalandurologynews.com)
  • Respiratory-resolved cardiac functional assessment is a promising approach to overcome the abovementioned limitations. (nature.com)
  • Phase contrast magnetic resonance imaging (PC-MRI) is a specific type of magnetic resonance imaging used primarily to determine flow velocities. (wikipedia.org)
  • Traditionally, magnetic resonance imaging (MRI) of flow using phase contrast (PC) methods is accomplished using methods that resolve single-directional flow in two spatial dimensions (2D) of an individual slice. (nih.gov)
  • Purpose: To characterize cardiac- and respiratory-driven cerebrospinal fluid (CSF) motions in intracranial space noninvasively, four-dimensional velocity mapping (4D-VM), correlation mapping, and power and frequency mapping with cardiac-gated and/or asynchronous magnetic resonance (MR) phase contrast (PC) techniques were conducted. (intechopen.com)
  • Ten minutes before the cardiac scan, the patient received intravenous contrast material (150 mL of 300 mgI/mL) for a CT study of his abdomen. (ahajournals.org)
  • The imaging technique used is phase contrast (PC) velocity mapping and relies on differential build-up of phase in flowing protons in comparison to protons in the static tissues. (escardio.org)
  • By phase contrast imaging, 10% of the left ventricular stroke volume coursed through the coronary artery fistula (Movie 8 and Image 8). (scmr.org)
  • Surface coils improve image quality compared with body coils by virtue of the improved signal-to-noise ratio, which results in better anatomic detail and tissue contrast. (ahrq.gov)
  • mean age 11.4 years) who had cardiac-gated trueFISP sequence and phase contrast CSF flow imaging as parts of routine MR imaging before and after surgical decompression. (pubmedcentralcanada.ca)
  • Phase-contrast magnetic resonance imaging (MRI) has been extensively used for qualitative and quantitative assessment of CSF flow at the craniovertebral junction. (pubmedcentralcanada.ca)
  • Each image was acquired by single-shot FLASH (~200 ms readout period) with TR of 4000 ms. CEST contrast map was generated using pixel-by-pixel Z-spectrum fitting. (springer.com)
  • Fig. 2(a-b) shows representative CEST contrast maps and corresponding LGE images in porcine and the patient. (springer.com)
  • The hypointense region in the CEST contrast map matches the bright area in LGE image closely, suggesting that the scar region has reduced creatine distribution and lower metabolic activity compared to healthy myocardium. (springer.com)
  • BACKGROUND: Ferumoxytol, an "off-label" contrast agent, allows for better cardiac MRI quality as compared with gadolinium-based contrast agents. (stanford.edu)
  • We have developed the photoacoustic microscopy (PAM) to achieve ultrasonic resolution and optical contrast in deep tissue imaging. (uwm.edu)
  • Pre- and post-contrast ANGIE imaging provides high-resolution ECV determination for the RV. (biomedcentral.com)
  • To assess if fully automated localization of the aorta can be achieved using phase contrast (PC) MR images. (ovid.com)
  • This is a contrast-enhanced examination designed by technique to visualise and assess the patency of the coronary arteries. (stjameshospital.com)
  • In 2007, we also introduced a new variant on myocardial wall motion and viability characterization with a gated inversion-recovery SSFP method yielding multiple images of varying T1 contrast across the cardiac cycle. (utoronto.ca)
  • Combined reading of Contrast Enhanced and Diffusion Weighted Magnetic Resonance Imaging by using a simple sum score. (ebscohost.com)
  • Dipyridamole myocardial blood flow (MBF) was assessed using 99mTc-sestamibi by measuring first-transit counts in the pulmonary artery and myocardial count rate from G-SPECT images. (nih.gov)
  • uses pulsed-wave Doppler measurement of pulmonary flow (PF) as an alternative method of cardiac output (CO) evaluation in a mouse model of myocardial infarction (MI). (visualsonics.com)
  • Three-dimensional (3D) techniques have been used to obtain datasets of the entire pulmonary tree within seconds. (appliedradiology.com)
  • The spin-labeling pulse is applied at the level of the pulmonary arteries, and imaging is performed over the lungs. (appliedradiology.com)
  • Still images of the 3D MRA in the axial and coronal plane at the same level showing the coronary artery fistula aneurysm (red *) and entrance of the fistula into the left atrium (red arrow) near the right upper pulmonary vein entrance. (scmr.org)
  • Cardiac MRI was ordered to assess the pulmonary venous drainage (especially the right pulmonary veins) and intracardiac anatomy, to evaluate for additional extracardiac lesions, and to quantify the left-to-right shunt (i.e., pulmonic to systemic blood flow [Qp:Qs] ratio). (aafp.org)
  • Pulmonary parenchyma imaging represents a unique challenge for magnetic resonance imaging (MRI). (scielo.br)
  • Recently, further improvements in MRI techniques have widened the potential for investigation of pulmonary parenchymal diseases. (scielo.br)
  • Describe the advantages and disadvantages of this technique for diagnosing pulmonary regurgitation. (renalandurologynews.com)
  • MRI of the coronary arteries is, however, a challenging task owing to motion of the vessels during cardiac contraction and respiration, the complexity of the anatomy in three dimensions, the small calibre of the vessels, and the fact that the vessels are embedded in fat which produces a competing signal. (bmj.com)
  • A stack of images extending to the cardiac apex isthen acquired during suspended respiration, at a slice thickness of approximately 6 to 8 mm, with 2mm interslice gap. (appliedradiology.com)
  • This study aimed to develop a cardiorespiratory-resolved 3D magnetic resonance imaging (5D MRI: x-y-z-cardiac-respiratory) approach based on 3D motion tracking for investigating the influence of respiration on cardiac ventricular function. (nature.com)
  • The heart displacement along respiration was extracted using a 3D image deformation algorithm, and this information was used to cluster the acquired data into multiple respiratory phases. (nature.com)
  • This nomenclature includes both general terms to describe quantities of radiation and specific terminology applicable to particular types of radiation sources or imaging modalities. (ahajournals.org)
  • In practice, a large number of cardiac CT referrals are for evaluation of coronary artery bypass grafts, exclusion of coronary artery disease in patients with a medium pretest probability of the disease, evaluation of coronary arteries prior to noncoronary cardiac or noncardiac surgery, evaluation of cardiac anatomy prior to minimally invasive cardiac valve or coronary surgery, and resolution of questions raised by other imaging modalities. (diagnosticimaging.com)
  • One of the major advantages of optical microscopy over other imaging modalities is its high spatio-temporal resolution 3 , 4 . (pubmedcentralcanada.ca)
  • Imaging of the head and neck has developed significantly with the advent of CT and MR. These modalities greatly compliment the physical and endoscopic examinations by revealing possible blind areas, such as subtle extension of neoplasms from the lower face and/or salivary glands to deep spaces, nonpalpable adenopathy, bone marrow invasion, and distant metastasis. (ucsd.edu)
  • Hence, existing high-resolution optical imaging modalities, including confocal microscopy, two-photon microscopy, and optical coherence tomography, are limited only to superficial tissues (~ 1 mm deep). (uwm.edu)
  • More time consuming than other imaging modalities. (renalandurologynews.com)
  • In a comparison of prospectively gated 64- and 256-slice CT scanning, the 256-slice scan provided better and more stable image quality, at equivalent effective radiation dose. (medscape.com)
  • Twelve cases of acute and isolated ON were imaged within 30 days of onset and followed prospectively. (neurology.org)
  • A cardiac MRI and chest MRA was performed to evaluate the etiology of left atrial dilation in the setting of a dilated coronary artery. (scmr.org)
  • Able to evaluate the cardiac structures with great specificity and able to evaluate chamber pressures. (infectiousdiseaseadvisor.com)
  • Imaging methods are needed to confirm the diagnosis, evaluate the severity of the right-to-left shunt and evaluate the impact on cardiac function. (diagnosticimaging.com)
  • The purpose of our investigation was to evaluate the safety of ferumoxytol in children undergoing general anaesthesia for cardiac MRI.METHODS: Medical records of children undergoing general anaesthesia for cardiac MRI were reviewed. (stanford.edu)
  • The researchers used PET images from cardiac stress tests to evaluate the effect the method had on signal-to-noise ratios. (healthimaging.com)
  • Cardiac MRI is used to detect or monitor cardiac disease and to evaluate the heart's anatomy and function in patients with both heart disease present at birth and heart diseases that develop after birth. (stjameshospital.com)
  • Another role of CTCA is to evaluate the cardiac function. (stjameshospital.com)
  • The PI hypothesizes that US, which provides real-time data similar to electrocardiography (ECG), can directly evaluate cardiac mechanical motion and would be more reliable than ECG at determining relative cardiac akinesia within a cardiac cycle. (grantome.com)
  • In Aim 1, the PI will evaluate US-gating relative to ECG-gating in determining relative cardiac quiescence. (grantome.com)
  • This study aimed to evaluate the incremental prognostic value of infarct size, microvascular obstruction (MO), myocardial salvage index (MSI), and left ventricular ejection fraction (LV-EF CMR ) assessed by cardiac magnetic resonance imaging (CMR) in comparison to traditional outcome markers in patients with ST-elevation myocardial infarction (STEMI) reperfused by primary percutaneous intervention (PCI). (biomedcentral.com)
  • In this paper we review and evaluate three approaches to thresholding images of test statistics: Bonferroni, random field and the permutation test. (ebscohost.com)
  • We evaluate these approaches on t images using simulations and a collection of real datasets. (ebscohost.com)
  • METHODS: Forty-five WPW patients were enrolled and had gated SPECT MPI pre- and 2-3 days post-RFA. (biomedsearch.com)
  • Methods for image segmentation should be standardized and calibrated. (springer.com)
  • This invention relates generally to methods and apparatus for computerized tomographic imaging, and more particularly to methods and apparatus for retrospectively generating computerized tomographic (CT) images of a moving body part without gating signals. (google.com)
  • The main limitation of traditional methods in a CTA image for the visualization of coronary artery disease is the inability to provide information about vessel walls [ 1 ]. (hindawi.com)
  • Preliminary in vivo study demonstrated that a whole heart coverage of 3D cine imaging can be achieved within 1 min and the technique had excellent performance compared to the standard ECG-triggering and conventional SG methods. (ismrm.org)
  • Regional wall motion was determined through two methods: using Gated SPECT, FBP and OSEM reconstructive methods and changes in frequency and spectrum slope in Metz, Butterworth and Ramp, it creates 42 sets. (scialert.net)
  • Exercising two physical factors of reconstructive methods and filtration in Gated SPECT, significant information can be obtained about cardiac wall motions. (scialert.net)
  • In addition to this finding, the researchers found image noise to be reduced by 60 percent compared with conventional imaging methods used during cardiac gating. (healthimaging.com)
  • On occasion, this technique provides clinically useful information that is not available with other imaging methods. (annals.org)
  • I was actively involved in developing techniques to measure cerebral activation in PET, assessing aerosol distribution in vivo using 3D methods, measuring changes in mucus clearance rates after therapeutic interventions, and in mapping airways ventilation patterns. (edu.au)
  • More recently, I have been involved in developing techniques and instrumentation for SPECT/CT multimodality imaging and investigating novel methods of measuring and utilising measures of error variance in reconstructed SPECT & PET images. (edu.au)
  • Continuous random field methods use the smoothness of the image to adapt to the severity of the multiple testing problem. (ebscohost.com)
  • Quantitative analysis in nuclear medicine imaging. (springer.com)
  • For quantitative evaluation 3 image series have been acquired: 2 single slice IntraGate™-FLASH cine series, one in 2 chamber and one in 4CV view and one multi-slice IntraGate™-FLASH cine SAX scan. (bruker.com)
  • This work shows that earlier work on the eigenbreast technique can be extended to newer datasets with higher resolution and produce synthetic phantoms that retain the quantitative properties of training data. (spiedigitallibrary.org)
  • The researchers said that the new 4D technique takes "crystal-clear" images by using quantitative image data and algorithms that help acquire better images. (healthimaging.com)
  • 9 Quantitative estimates of myocardial blood flow (MBF) for both rest and pharmacological-stress images, and coronary flow reserve (CFR) are added advantages available with PET phase analysis. (springer.com)
  • This protocol is often referred to as a 'cardiac function' examination and is performed when the specific indication relates to the intracardiac anatomy, assessment of valve function or quantitative assessment of ventricular size and systolic function. (ijri.org)
  • Quantitative imaging is an increasing need in basic science research as morphological consequences of conditional mutations and microscale environmental alterations initiate subtle but progressive malformations that resemble clinically relevant defects. (wiley.com)
  • New quantitative analysis tools we introduced in association with this method yield more repeatable estimates of the extent of heterogeneous infarct, a measurement which reflects the risk of sudden cardiac death associated with complex arrhythmias, as demonstrated in a study following patients receiving implantable cardioverter defibrillators. (utoronto.ca)
  • The capabilities offered by modern radiation therapy units and the widespread availability of combined PET/CT scanners stimulated the development of biological PET imaging-guided radiation therapy treatment planning with the aim to produce highly conformal radiation dose distribution to the tumour. (springer.com)
  • Filters that are placed beneath the x-ray tube selectively attenuate low-energy x-rays that do not contribute to image formation, but do add to the total radiation dose. (appliedradiology.com)
  • Areas assessed included image quality and effective radiation dose (ED). (bjcardio.co.uk)
  • This will lead to a reliable, rapid, low-radiation dose, non-invasive alternative technique for evaluating coronary arteries, and potentially decrease health care costs by several billion dollars annually. (grantome.com)
  • RESULTS Overall 74% (range 50% to 90%) of the proximal and mid coronary artery segments were visualised with an image quality suitable for further analysis. (bmj.com)
  • Coronary artery motion during cardiac contraction is successfully minimised by ECG triggering, with data collection over 100 to 150 ms during mid to late diastole. (bmj.com)
  • This allows the complex coronary artery anatomy to be studied with a three dimensional technique (3D-MRCA). (bmj.com)
  • C, Images were reformatted to give a longitudinal view that shows both the cross-section of the calcified right coronary artery and the circumflex branch of the left coronary artery (Cx). (ahajournals.org)
  • Cardiac CT can be performed to detect coronary artery stenoses and assess nonobstructive stages of coronary atherosclerosis either through calcium measurement or the analysis of calcified and noncalcified plaque. (appliedradiology.com)
  • Figures 1 B to 1 D show a comparison of SAX views derived from a healthy mouse heart (B) with images obtained from animal models of myocardial infarction (C, D). For this purpose occlusion of the left anterior descending LAD coronary artery was applied. (bruker.com)
  • There was no evidence of thrombus in the atria, but there was concern for possible mural thrombus versus calcification in one of the aneurysmal segments of the coronary artery fistula (Image 5). (scmr.org)
  • Actually, the degree of ventricular dysfunction, of coronary artery disease and of emergency, condition the choice of the technique. (escardio.org)
  • To understand the structure-function relationship in the postinfarcted myocardium in rabbits, we induced cardiac ischemia by ligating the left circumflex coronary artery. (biomedsearch.com)
  • The most important indication for cardiac CT is the exclusion of coronary artery stenosis in patients suffering from atypical chest pain who have a low to intermediate pretest probability of the disease and an inconclusive stress test (Figure 2). (diagnosticimaging.com)
  • 15 Calcium deposits within the coronary artery wall that are measured by unenhanced low-dose cardiac CT (i.e., calcium scoring) can serve as an independent and powerful prognostic parameter for the subsequent development of major cardiac events. (diagnosticimaging.com)
  • A cardiac MRI (Single-shot and late Gadolinium) demonstrated an aneurysmal right coronary artery graft as a mass adjacent to right heart border and compressing RA. (eurorad.org)
  • Objectives: To characterize remaining coronary artery motion of beating pig hearts after stabilization with an 'Octopus' using an optical remote analysis technique. (uzh.ch)
  • All patients with abnormal MPS had further imaging with CTCA, CTCA was normal in 30 (85%) patients, one patient had coronary artery stenosis more than 50%, one patient had coronary artery stenosis less than 50%, one patient had anomalous origin coronary artery, and 2 patients had myocardial bridging. (pulsus.com)
  • CCTA is helpful in this group of patients for evaluation of coronary artery and cardiac morphology. (pulsus.com)
  • Robotic surgical systems and devices are well suited for use in performing minimally invasive medical procedures, as opposed to conventional techniques wherein the patient's body cavity is open to permit the surgeon's hands access to internal organs. (google.ca)
  • The conventional stress and rest tomograms were interpreted first by means of a 14-segment scoring system, and then the studies were reinterpreted while the gated images were viewed. (onlinejacc.org)
  • To that end, the approach taken in this work was to combine conventional B-mode, Acoustic Radiation Force Impulse (ARFI), Shear Wave Elasticity Imaging (SWEI), and spectral Doppler techniques into a single imaging system capable of simultaneously measuring the tissue displacements and WSR throughout the cardiac cycle and over several heartbeats. (spie.org)
  • The basic principle of ghosting can be explained with the help of Echo-Planar Imaging (EPI). (wikipedia.org)
  • The multi-shot echo planar images tend to capture more data than that of the single shot EPI. (wikipedia.org)
  • Gradient recalled echo MR imaging of the jugular foramen. (ajnr.org)
  • Dural sinus thrombosis: verification with spin-echo techniques. (ajnr.org)
  • Given the velocity of wave propagation in soft tissue (∼1,530 m/s) and the propagation distance for a typical cardiac examination (∼30 cm return-trip from the chest wall to the atrial roof), this measurement takes ∼200 μs, implying that, for transthoracic cardiac applications, ∼5,000 pulse-echo measurements can be made every second. (onlinejacc.org)
  • To construct a 2D cardiac image, conventionally ∼180 pulse-echo measurements are performed by sending pulses sequentially into 180 different directions within a plane covering a 90° angle ( Fig. 1A ). (onlinejacc.org)
  • echo planar imaging a technique for obtaining a magnetic resonance image in less than 50 msec. (thefreedictionary.com)
  • ECHO cardiogram showed akinesia of the mid-basal cardiac wall and the mass turned out to be a pseudo-aneurysm containing some thrombus. (eurorad.org)
  • Spin-echo (SE) T1 weighted gadolinium images and T2 weighted FSE images, both utilizing fat saturation, are the key means of evaluating tumors, as this optimizes tumor conspicuity. (ucsd.edu)
  • Viability imaging was performed after intravenous injection of 0.15 mmol/kg gadolinium to assess the extent of infarction. (biomedsearch.com)
  • Imaging is also useful in detecting pericardial effusion, concomitant valvular or congenital heart disease, and marked depression of ventricular function that may interdict treatment in the acute phase with beta-adrenergic blockers. (medscape.com)
  • Cardiac magnetic resonance imaging (CMR) has become integrated into the routine care of individuals with congenital heart disease. (ijri.org)
  • A 71-year-old man with hypertension, hypercholesterolemia, and known aortic and peripheral vascular disease was imaged with a LightSpeed 4-slice, multislice CT scanner (GE Medical Systems). (ahajournals.org)
  • This allows review of aortic valve morphologic features on static images at end systole and end diastole, measurement of aortic valve surface area and the review of valve leaflet motion in cine mode. (bartleby.com)
  • Modern techniques for repair of thoracic aneurysms and dissections include an open incision with extracorporeal bypass and aortic clamping. (bartleby.com)
  • For the assessment of aortic stenosis main use of PC imaging is to derive maximum velocity (Vmax) of the aortic stenosis jet. (escardio.org)
  • In addition, associated abnormalities such aortic coartaction, lung sequestration, persisting left superior vena cava, cardiac valvular abnormalities, lung hypoplasia and other cardiac or pulmunary abnormalities may be complementary assessed by CT and MRI. (diagnosticimaging.com)
  • Magnetic resonance imaging (MRI) assessment of ventricular remodeling after myocardial infarction in rabbits. (biomedsearch.com)
  • In this work, we developed an optimized cardiac CEST technique with dramatically shortened scan time (by 10-fold), improved motion registration and CEST signal calculation, and tested its feasibility to detect chronic myocardial infarction in porcine model and also in a patient for the first time. (springer.com)
  • LGE images were acquired as reference for myocardial infarction. (springer.com)
  • We developed a clinically feasible cardiac CEST approach and performed preliminary validation studies in porcine with chronic myocardial infarction. (springer.com)
  • Gadolinium-administration showed no enhancement, a feature required to exclude cardiac malignancies and areas of myocardial infarction. (eurorad.org)
  • A multislice scanner operated in helical mode provides information that can be used to reconstruct 3D cardiac images in arbitrary phases of the cardiac cycle. (ahajournals.org)
  • A certain number of phases are acquired for each cardiac cycle. (scmr.org)
  • 2. Instead of prescribing the number of cardiac phases, we use the automated option on the scanner. (scmr.org)
  • An important issue in the evaluation is a careful segmentation of epi- and endocardial borders (Fig. 1A) which has to be done for all slices covering the left ventricle for cardiac phases derived from end systole and end diastole. (bruker.com)
  • In order to achieve the best possible image quality, cardiac phases must be found during which the heart is nearly stationary. (spie.org)
  • The advantage of this approach is that all cardiac phases are imaged. (radiopaedia.org)
  • The obtained initial results suggested that this new approach allows evaluation of cardiac function during specific respiratory phases. (nature.com)
  • The aims of this study were to present the methodology, to validate the gated SPECT cardiac quantification (GSCQ) method in phantoms and patients, and to determine normal values of LVEF. (nih.gov)
  • RV quantification can be improved by using axial views or, preferably, dedicated RV sequences where the tricuspid valve is imaged in the margin of the slice. (appliedradiology.com)
  • Magnetic resonance imaging also can measure blood flow for quantification of left-to-right shunts, regurgitant fractions, and pressure gradients. (aafp.org)
  • dyssynchrony quantification in short-axis magnetic resonance imaging . (psu.edu)
  • Cardiac magnetic resonance imaging (CMR) has been considered the gold standard for quantification of heart volume and function 1 , 2 . (nature.com)
  • Faster and variable gantry rotation speeds will improve temporal resolution and image quality over a greater range of heart rates and rhythms. (ahajournals.org)
  • However, the temporal resolution of gated radionuclide imaging is inherently poor due to the usual 8- or 16-bin gating. (springer.com)
  • The rationale for building hardware is that the stringent temporal resolution requirements for prospective triggering of cardiac CT dictate that the US analysis be performed in real-time on a large volume of data;this cannot be accomplished by software in real-time. (grantome.com)
  • The main idea of the current paper is to provide a well-constructed analysis of the article titled "Meta-analysis of thoracic epidural anesthesia versus general anesthesia for cardiac surgery" written by Svircevic, van Dijk, Nierich, Passier, Kalkman, van der Heijden, and Bax in 2011. (bartleby.com)
  • It is a medical technique used to treat shortness of breath (American Thoracic Society). (bartleby.com)
  • Low dose imaging of the thoracic aorta with maintenance of image quality and sharpness is achievable using a prospective cardiac gated low kilovoltage technique. (biomedcentral.com)
  • Although respiratory gating improves thoracic and abdominal imaging, the inherent time delays limit its usefulness. (ahrq.gov)
  • A chest x-ray images the heart and surrounding thoracic anatomy, shows heart size and shape, and reveals whether the heart is misshapen or enlarged due to disease. (imaginis.com)
  • A chest X-ray (Figure 1) demostrated an hypoplastic right lung with dextroposition of the heart and enlarged cardiac contour. (diagnosticimaging.com)
  • Chest x-rays can also be used to image pacemakers and artificial heart valves to check for correct positioning. (imaginis.com)
  • It is a medical imaging method employing tomography where digital geometry processing is used to generate a three-dimensional image of the internals of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. (bionity.com)
  • As a tribute to the impact of this system on medical imaging the Mayo Clinic has an EMI scanner on display in the Radiology Department. (bionity.com)
  • Without restrictions in imaging time imposed by the patient's breathhold limits, longer imaging sequences can be used. (bmj.com)
  • These optimizations are principally in the use of ECG gating and rapid imaging techniques or sequences. (wikipedia.org)
  • New volumetric acquisitions can shorten and simplify the scan as they can replace several sequences, acquiring the entire cardiac volume at once. (wikipedia.org)
  • Bright-blood steady state free precession (SSFP) sequences provide moving cine images with a high signal-to-noise ratio (SNR) and excellent endocardial definition. (appliedradiology.com)
  • Since fat remains bright on FSE T2 sequences, fat saturation can be helpful in eliminating competing fat signal from the image, thereby making the pathology more conspicuous. (ucsd.edu)
  • Describe the advantages and disadvantages of this technique for diagnosis of cardiac tumors. (psychiatryadvisor.com)
  • V. Describe the advantages and disadvantages of the alternative techniques for diagnosis of cardiac tumors. (psychiatryadvisor.com)
  • Left Ventricular measurements taken from a B-Mode parasternal long axis image. (visualsonics.com)
  • A large cardiac silhouette with similar hemodynamics may reflect hemopericardium and tamponade or right ventricular (RV) MI that is compromising cardiac output. (medscape.com)
  • Morphologic variants of atrial, ventricular, valvular,arterial and venous structures can be imaged with unsurpassed definition. (appliedradiology.com)
  • Using either automated or manual techniques, the endocardial and epicardial borders are traced for each slice and the ventricular volumes are calculated. (appliedradiology.com)
  • Accurate right ventricular (RV) assessment demands 3-dimensional techniques because of the non-geometric shape of the ventricle.The RV position has also traditionally made reliable echocardiographic measurements difficult. (appliedradiology.com)
  • and also to allow calculation of left ventricular ejection fraction, stroke volume, and cardiac output. (utah.edu)
  • The cardiac MRI identified severe left atrial dilation, mild mitral valve insufficiency, and normal bi-ventricular size and systolic function (Movie 3 and Table 1). (scmr.org)
  • Left ventricular asynchrony (LVAS) or dyssynchrony refers to abnormal myocardial activation during a cardiac cycle resulting in inhomogeneous left ventricular contraction and reduced left ventricular function. (springer.com)
  • Furthermore, in many cases, measurements are profoundly affected by respiratory and cardiac motion. (pubmedcentralcanada.ca)
  • The other thity were examined with prospective gating and low dosage parameters (100 kV, 170 mAs) with the scanner in a Step and Shoot (SAS) mode that automatically recognizes and does not acquire data during ectopic heart beats. (biomedcentral.com)
  • For Aim 3, the PI will initiate the design and simulation of prototype hardware based on Digital Signal Processing and Field Programmable Gate Array technologies to provide an optimal, prospective real-time trigger for CTCA. (grantome.com)
  • The technique is widely used and validated in the assessment of valvular heart diseases. (escardio.org)
  • Offers exquisite detail of the cardiac valvular architecture and helps detect any other coexisting abnormalities. (renalandurologynews.com)
  • 1 Cardiac computed tomographic (CT) volume doubled between 2002 and 2003, to 485 000 cases, 2 and has continued to grow since then. (ahajournals.org)
  • The first production X-ray CT machine (in fact called the "EMI-Scanner") was limited to making tomographic sections of the brain, but acquired the image data in about 4 minutes (scanning two adjacent slices) and the computation time (using a Data General Nova minicomputer) was about 7 minutes per picture. (bionity.com)
  • The PC image is generally paired with the corresponding magnitude cine images. (escardio.org)
  • A region of interest (e.g., borders of a vessel) is drawn by the user in every frame of the through plane cine images in a cardiac cycle. (escardio.org)
  • Cardiac MR Cine imaging may offer a dynamic evaluation of the blood flow through the chambers and valves. (infectiousdiseaseadvisor.com)
  • An accelerated self-gating (SG) technique, SparseSG, was developed to realize whole-heart coverage of 3D cardiac cine imaging at 3T without ECG and breath-holding. (ismrm.org)
  • Good quality CINE images from the fetus in the third trimester were acquired. (ismrm.org)
  • Thus, it can enable investigation of effects related to respiratory variability and better assessment of cardiac function for studying respiratory and/or cardiac dysfunction. (nature.com)
  • Conservative management is generally appropriate, although surgical treatment may be considered in symptomatic patients, with other associated cardiac abnormalities or with a Qp/Qs higher than 1.7. (diagnosticimaging.com)
  • This technique has the potential to provide information on metabolic abnormalities for cardiac diseases. (springer.com)
  • This negative result likely reflects normalization of any transient wall motion abnormalities since the stress images are acquired 45-60 minutes after tracer injection during exercise. (springer.com)
  • If occult, with no ECG changes or biochemical abnormalities, detection as an incidental finding on imaging is possible [7]. (eurorad.org)
  • electrostatic imaging a method of visualizing deep structures of the body, in which an electron beam is passed through the patient and the emerging beam strikes an electrostatically charged plate, dissipating the charge according to the strength of the beam. (thefreedictionary.com)
  • Surface and other specialty coils enhance the quality of MR images, particularly for small structures that require greater spatial resolution. (ahrq.gov)
  • Although historically (see below) the images generated were in the axial or transverse plane (orthogonal to the long axis of the body), modern scanners allow this volume of data to be reformatted in various planes or even as volumetric (3D) representations of structures. (bionity.com)
  • Cardiac magnetic resonance imaging (MRI) uses a powerful magnetic field, radio waves and a computer to produce detailed pictures of the structures within and around the heart. (stjameshospital.com)
  • Phase analysis of gated SPECT MPI was used to assess LV dyssynchrony pre- and post-RFA. (biomedsearch.com)
  • CONCLUSION: Phase analysis of gated SPECT MPI demonstrated that LV mechanical dyssynchrony can be present in patients with WPW syndrome. (biomedsearch.com)
  • This study supports further investigation in the relationship between electrical and mechanical activation using EPS and phase analysis of gated SPECT MPI. (biomedsearch.com)
  • The increasingly sophisticated treatment of patients with cardiac disorders has created the need for accurate and reproducible measurements of cardiac chamber volumes and function. (appliedradiology.com)
  • However, its main challenges include lengthy scan times and potential inaccuracies in measurements due to cardiac and respiratory motion. (nature.com)
  • We hypothesize that directional diffusivity measurements from diffusion tensor imaging (DTI) can detect structural changes within white-matter tracts, and differentiate axonal injury from demyelination. (neurology.org)
  • The phantoms were created based on patient images with normal anatomy (age range: 27 to 66 years, weight range: 52.0 to 105.8 kg). (spiedigitallibrary.org)
  • RESULTS: NURBS are an efficient and flexible way to accurately model the anatomy and cardiac and respiratory motions for a realistic 4-D digital mouse phantom. (duke.edu)
  • This algorithm uses iterative approach to correct the distorted image by using the motion models. (wikipedia.org)
  • The K-means cluster classification algorithm was used to separate the LV region from non-LV regions on the binary images. (nih.gov)
  • A computer then uses a sophisticated algorithm to "reconstruct" a 3D image. (utah.edu)
  • horizontal beam imaging a grid positioning technique in radiology in which the grid cassette is positioned with its lead lines perpendicular to the floor. (thefreedictionary.com)
  • 3-6 Cardiac imaging has never had such a prominent, expansive body of evidence indicating the role of radiology in patient management. (diagnosticimaging.com)
  • Dr. Todoran has received the American Society of Nuclear Cardiology Imaging Award and currently has research support from American Society of Nuclear Cardiology Research Foundation. (appliedradiology.com)
  • Since modern PC-MRI is typically time-resolved, it provides a means of 4D imaging (three spatial dimensions plus time). (wikipedia.org)
  • The difficulty in PET image segmentation is compounded by the low spatial resolution and high noise characteristics of PET images. (springer.com)
  • Black blood imaging can be used to create still-frame images with high spatial resolution for morphologic analysis (Figure 1). (appliedradiology.com)
  • In ASL techniques, saturation, spatial, or adiabatic inversion pulses are applied to water molecules outside the imaging field, and their signal is imaged as they enter the field. (appliedradiology.com)
  • The process of removing the movement of images in an MRI scan is known as deghosting. (wikipedia.org)
  • CMR uses several different techniques within a single scan. (wikipedia.org)
  • The technique works by extracting data from different points during the scan (i.e., when patients take a breath). (healthimaging.com)
  • Chen noted that the technique may also have the ability to lower dose and produce a faster scan. (healthimaging.com)
  • Fast/multi-slice spiral CT scan with ECG gating is a new non-invasive method of imaging the heart and coronary arteries. (imaginis.com)
  • mean age 57.6 ± 11.5 years) underwent gated SPECT Tc-99m sestamibi imaging (212 with exercise, 63 with dipyridamole and 10 with dobutamine). (onlinejacc.org)
  • So, 246 patients (140 males) underwent cardiac CT: 124 consecutive patients underwent a routine scanning protocol, with images reconstructed with FBP, and 122 patients with IR technique. (bjcardio.co.uk)
  • Patients with abnormal MPS underwent additional imaging with CCTA. (pulsus.com)
  • Multislice CT allows for rapid cardiac imaging during a single breath-hold. (ahajournals.org)
  • The rabbits were anesthetized under 1.5% isoflurane ventilation, and ultrafast techniques made breath-hold 3D coverage in different cardiac axes feasible. (biomedsearch.com)
  • Ultra-fast 2D and 3D imaging techniques coupled with the latest MR hardware now allow improved diagnosis in as little as a single breath-hold. (imaginis.com)
  • Imaging the coronary arteries is difficult because of their small diameters and the motion during the cardiac cycle. (appliedradiology.com)
  • 1. When a patient has variable heart rates, one can set the heart rate to the approximate median heart rate with the thought that this will be the most representative cardiac cycle length. (scmr.org)
  • If an R-R interval is longer than the pre-specified interval, the remaining portion of the cardiac cycle will be truncated and will not be included in the k-space. (scmr.org)
  • By applying this new method in a patient with AF, it makes each cardiac cycle more uniform. (scmr.org)
  • Imaging data is acquired in a continuous fashion throughout the whole cardiac cycle. (radiopaedia.org)
  • Experts have used parameters such as flow velocity, flow pulsation magnitude, and temporal variations during the cardiac cycle for assessment of CSF flow dynamics [ 2 , 5 - 8 ]. (pubmedcentralcanada.ca)
  • (a) ECG trigger delay is set so that the readout is in the quiescent phase of the cardiac cycle. (springer.com)
  • This essentially assesses the dispersion in the timing of myocardial contraction in individual segments during a cardiac cycle. (springer.com)
  • Cardiac gated acquisitions are possible with SPECT, just as with planar imaging techniques such as MUGA. (utah.edu)