Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures.
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.
A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitized image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues.
Substances used to allow enhanced visualization of tissues.
Radiography of blood vessels after injection of a contrast medium.
Radiography of the vascular system of the brain after injection of a contrast medium.
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
Gadolinium. An element of the rare earth family of metals. It has the atomic symbol Gd, atomic number 64, and atomic weight 157.25. Its oxide is used in the control rods of some nuclear reactors.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
A complex of gadolinium with a chelating agent, diethylenetriamine penta-acetic acid (DTPA see PENTETIC ACID), that is given to enhance the image in cranial and spinal MRIs. (From Martindale, The Extra Pharmacopoeia, 30th ed, p706)
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
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)
Improvement of the quality of a picture by various techniques, including computer processing, digital filtering, echocardiographic techniques, light and ultrastructural MICROSCOPY, fluorescence spectrometry and microscopy, scintigraphy, and in vitro image processing at the molecular level.
A polygonal anastomosis at the base of the brain formed by the internal carotid (CAROTID ARTERY, INTERNAL), proximal parts of the anterior, middle, and posterior cerebral arteries (ANTERIOR CEREBRAL ARTERY; MIDDLE CEREBRAL ARTERY; POSTERIOR CEREBRAL ARTERY), the anterior communicating artery and the posterior communicating arteries.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Ultrasonography applying the Doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the Doppler shift frequency.
Narrowing or stricture of any part of the CAROTID ARTERIES, most often due to atherosclerotic plaque formation. Ulcerations may form in atherosclerotic plaques and induce THROMBUS formation. Platelet or cholesterol emboli may arise from stenotic carotid lesions and induce a TRANSIENT ISCHEMIC ATTACK; CEREBROVASCULAR ACCIDENT; or temporary blindness (AMAUROSIS FUGAX). (From Adams et al., Principles of Neurology, 6th ed, pp 822-3)
Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841)
Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose.
Pathological processes which result in the partial or complete obstruction of ARTERIES. They are characterized by greatly reduced or absence of blood flow through these vessels. They are also known as arterial insufficiency.
Pathological conditions of intracranial ARTERIES supplying the CEREBRUM. These diseases often are due to abnormalities or pathological processes in the ANTERIOR CEREBRAL ARTERY; MIDDLE CEREBRAL ARTERY; and POSTERIOR CEREBRAL ARTERY.
The condition of an anatomical structure's being constricted beyond normal dimensions.
Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.
Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.
Narrowing or occlusion of the RENAL ARTERY or arteries. It is due usually to ATHEROSCLEROSIS; FIBROMUSCULAR DYSPLASIA; THROMBOSIS; EMBOLISM, or external pressure. The reduced renal perfusion can lead to renovascular hypertension (HYPERTENSION, RENOVASCULAR).
The first branch of the SUBCLAVIAN ARTERY with distribution to muscles of the NECK; VERTEBRAE; SPINAL CORD; CEREBELLUM; and interior of the CEREBRUM.
Localized or diffuse reduction in blood flow through the vertebrobasilar arterial system, which supplies the BRAIN STEM; CEREBELLUM; OCCIPITAL LOBE; medial TEMPORAL LOBE; and THALAMUS. Characteristic clinical features include SYNCOPE; lightheadedness; visual disturbances; and VERTIGO. BRAIN STEM INFARCTIONS or other BRAIN INFARCTION may be associated.
The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
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.
The arterial blood vessels supplying the CEREBRUM.
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.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
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.
Artery formed by the bifurcation of the internal carotid artery (CAROTID ARTERY, INTERNAL). Branches of the anterior cerebral artery supply the CAUDATE NUCLEUS; INTERNAL CAPSULE; PUTAMEN; SEPTAL NUCLEI; GYRUS CINGULI; and surfaces of the FRONTAL LOBE and PARIETAL LOBE.
Artery formed by the bifurcation of the BASILAR ARTERY. Branches of the posterior cerebral artery supply portions of the OCCIPITAL LOBE; PARIETAL LOBE; inferior temporal gyrus, brainstem, and CHOROID PLEXUS.
A class of compounds of the type R-M, where a C atom is joined directly to any other element except H, C, N, O, F, Cl, Br, I, or At. (Grant & Hackh's Chemical Dictionary, 5th ed)
1-Deoxy-1-(methylamino)-D-glucitol. A derivative of sorbitol in which the hydroxyl group in position 1 is replaced by a methylamino group. Often used in conjunction with iodinated organic compounds as contrast medium.
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.
Congenital vascular anomalies in the brain characterized by direct communication between an artery and a vein without passing through the CAPILLARIES. The locations and size of the shunts determine the symptoms including HEADACHES; SEIZURES; STROKE; INTRACRANIAL HEMORRHAGES; mass effect; and vascular steal effect.
Pathological conditions involving ARTERIES in the skull, such as arteries supplying the CEREBRUM, the CEREBELLUM, the BRAIN STEM, and associated structures. They include atherosclerotic, congenital, traumatic, infectious, inflammatory, and other pathological processes.
The veins that return the oxygenated blood from the lungs to the left atrium of the heart.
A branch of the abdominal aorta which supplies the kidneys, adrenal glands and ureters.
The excision of the thickened, atheromatous tunica intima of a carotid artery.
The circulation of blood through the BLOOD VESSELS of the BRAIN.
Care given during the period prior to undergoing surgery when psychological and physical preparations are made according to the special needs of the individual patient. This period spans the time between admission to the hospital to the time the surgery begins. (From Dictionary of Health Services Management, 2d ed)
Either of the two principal arteries on both sides of the neck that supply blood to the head and neck; each divides into two branches, the internal carotid artery and the external carotid artery.
Vascular diseases characterized by thickening and hardening of the walls of ARTERIES inside the SKULL. There are three subtypes: (1) atherosclerosis with fatty deposits in the ARTERIAL INTIMA; (2) Monckeberg's sclerosis with calcium deposits in the media and (3) arteriolosclerosis involving the small caliber arteries. Clinical signs include HEADACHE; CONFUSION; transient blindness (AMAUROSIS FUGAX); speech impairment; and HEMIPARESIS.
Ultrasonography applying the Doppler effect, with the superposition of flow information as colors on a gray scale in a real-time image. This type of ultrasonography is well-suited to identifying the location of high-velocity flow (such as in a stenosis) or of mapping the extent of flow in a certain region.
Maintenance of blood flow to an organ despite obstruction of a principal vessel. Blood flow is maintained through small vessels.
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
NECROSIS induced by ISCHEMIA in the POSTERIOR CEREBRAL ARTERY distribution system which supplies portions of the BRAIN STEM; the THALAMUS; TEMPORAL LOBE, and OCCIPITAL LOBE. Depending on the size and location of infarction, clinical features include OLFACTION DISORDERS and visual problems (AGNOSIA; ALEXIA; HEMIANOPSIA).
A non-invasive technique using ultrasound for the measurement of cerebrovascular hemodynamics, particularly cerebral blood flow velocity and cerebral collateral flow. With a high-intensity, low-frequency pulse probe, the intracranial arteries may be studied transtemporally, transorbitally, or from below the foramen magnum.
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.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
The anterior and posterior arteries created at the bifurcation of the popliteal artery. The anterior tibial artery begins at the lower border of the popliteus muscle and lies along the tibia at the distal part of the leg to surface superficially anterior to the ankle joint. Its branches are distributed throughout the leg, ankle, and foot. The posterior tibial artery begins at the lower border of the popliteus muscle, lies behind the tibia in the lower part of its course, and is found situated between the medial malleolus and the medial process of the calcaneal tuberosity. Its branches are distributed throughout the leg and foot.
Pathological processes involving any one of the BLOOD VESSELS in the vasculature outside the HEART.
An anomalous pulmonary venous return in which the right PULMONARY VEIN is not connected to the LEFT ATRIUM but to the INFERIOR VENA CAVA. Scimitar syndrome is named for the crescent- or Turkish sword-like shadow in the chest radiography and is often associated with hypoplasia of the right lung and right pulmonary artery, and dextroposition of the heart.
The veins and arteries of the HEART.
A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.
The tearing or bursting of the weakened wall of the aneurysmal sac, usually heralded by sudden worsening pain. The great danger of a ruptured aneurysm is the large amount of blood spilling into the surrounding tissues and cavities, causing HEMORRHAGIC SHOCK.
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.
Splitting of the vessel wall in the VERTEBRAL ARTERY. Interstitial hemorrhage into the media of the vessel wall can lead to occlusion of the vertebral artery, aneurysm formation, or THROMBOEMBOLISM. Vertebral artery dissection is often associated with TRAUMA and injuries to the head-neck region but can occur spontaneously.
A method of hemostasis utilizing various agents such as Gelfoam, silastic, metal, glass, or plastic pellets, autologous clot, fat, and muscle as emboli. It has been used in the treatment of spinal cord and INTRACRANIAL ARTERIOVENOUS MALFORMATIONS, renal arteriovenous fistulas, gastrointestinal bleeding, epistaxis, hypersplenism, certain highly vascular tumors, traumatic rupture of blood vessels, and control of operative hemorrhage.
Examination of the portal circulation by the use of X-ray films after injection of radiopaque material.
The artery formed by the union of the right and left vertebral arteries; it runs from the lower to the upper border of the pons, where it bifurcates into the two posterior cerebral arteries.
A noninflammatory, progressive occlusion of the intracranial CAROTID ARTERIES and the formation of netlike collateral arteries arising from the CIRCLE OF WILLIS. Cerebral angiogram shows the puff-of-smoke (moyamoya) collaterals at the base of the brain. It is characterized by endothelial HYPERPLASIA and FIBROSIS with thickening of arterial walls. This disease primarily affects children but can also occur in adults.
Ultrasonography applying the Doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. (Stedman, 25th ed)
A spectrum of congenital, inherited, or acquired abnormalities in BLOOD VESSELS that can adversely affect the normal blood flow in ARTERIES or VEINS. Most are congenital defects such as abnormal communications between blood vessels (fistula), shunting of arterial blood directly into veins bypassing the CAPILLARIES (arteriovenous malformations), formation of large dilated blood blood-filled vessels (cavernous angioma), and swollen capillaries (capillary telangiectases). In rare cases, vascular malformations can result from trauma or diseases.
A spectrum of pathological conditions of impaired blood flow in the brain. They can involve vessels (ARTERIES or VEINS) in the CEREBRUM, the CEREBELLUM, and the BRAIN STEM. Major categories include INTRACRANIAL ARTERIOVENOUS MALFORMATIONS; BRAIN ISCHEMIA; CEREBRAL HEMORRHAGE; and others.
Pathological conditions involving the CAROTID ARTERIES, including the common, internal, and external carotid arteries. ATHEROSCLEROSIS and TRAUMA are relatively frequent causes of carotid artery pathology.
Visualization of a vascular system after intravenous injection of a fluorescein solution. The images may be photographed or televised. It is used especially in studying the retinal and uveal vasculature.
An idiopathic, segmental, nonatheromatous disease of the musculature of arterial walls, leading to STENOSIS of small and medium-sized arteries. There is true proliferation of SMOOTH MUSCLE CELLS and fibrous tissue. Fibromuscular dysplasia lesions are smooth stenosis and occur most often in the renal and carotid arteries. They may also occur in other peripheral arteries of the extremity.
Devices that provide support for tubular structures that are being anastomosed or for body cavities during skin grafting.
The inferior part of the lower extremity between the KNEE and the ANKLE.
Improvement in the quality of an x-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed.
Any visual display of structural or functional patterns of organs or tissues for diagnostic evaluation. It includes measuring physiologic and metabolic responses to physical and chemical stimuli, as well as ultramicroscopy.
INFARCTION of the dorsolateral aspect of MEDULLA OBLONGATA in the BRAIN STEM. It is caused by occlusion of the VERTEBRAL ARTERY and/or the posterior inferior cerebellar artery. Clinical manifestations vary with the size of infarction, but may include loss of pain and temperature sensation in the ipsilateral face and contralateral body below the chin; ipsilateral HORNER SYNDROME; ipsilateral ATAXIA; DYSARTHRIA; VERTIGO; nausea, hiccup; dysphagia; and VOCAL CORD PARALYSIS. (From Adams et al., Principles of Neurology, 6th ed, p801)
Radiographic visualization or recording of a vein after the injection of contrast medium.
Branch of the common carotid artery which supplies the exterior of the head, the face, and the greater part of the neck.
Elements of limited time intervals, contributing to particular results or situations.
Radiographic visualization of the aorta and its branches by injection of contrast media, using percutaneous puncture or catheterization procedures.
A group of pathological conditions characterized by sudden, non-convulsive loss of neurological function due to BRAIN ISCHEMIA or INTRACRANIAL HEMORRHAGES. Stroke is classified by the type of tissue NECROSIS, such as the anatomic location, vasculature involved, etiology, age of the affected individual, and hemorrhagic vs. non-hemorrhagic nature. (From Adams et al., Principles of Neurology, 6th ed, pp777-810)
Either of two large arteries originating from the abdominal aorta; they supply blood to the pelvis, abdominal wall and legs.
A type of MAGNETIC RESONANCE IMAGING that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications.
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.
Unanticipated information discovered in the course of testing or medical care. Used in discussions of information that may have social or psychological consequences, such as when it is learned that a child's biological father is someone other than the putative father, or that a person tested for one disease or disorder has, or is at risk for, something else.
Veins draining the cerebrum.
The arterial trunk that arises from the abdominal aorta and after a short course divides into the left gastric, common hepatic and splenic arteries.
Localized reduction of blood flow to brain tissue due to arterial obstruction or systemic hypoperfusion. This frequently occurs in conjunction with brain hypoxia (HYPOXIA, BRAIN). Prolonged ischemia is associated with BRAIN INFARCTION.
Brief reversible episodes of focal, nonconvulsive ischemic dysfunction of the brain having a duration of less than 24 hours, and usually less than one hour, caused by transient thrombotic or embolic blood vessel occlusion or stenosis. Events may be classified by arterial distribution, temporal pattern, or etiology (e.g., embolic vs. thrombotic). (From Adams et al., Principles of Neurology, 6th ed, pp814-6)
The degree to which BLOOD VESSELS are not blocked or obstructed.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
The largest of the cerebral arteries. It trifurcates into temporal, frontal, and parietal branches supplying blood to most of the parenchyma of these lobes in the CEREBRAL CORTEX. These are the areas involved in motor, sensory, and speech activities.
Hypertension due to RENAL ARTERY OBSTRUCTION or compression.
Inflammation of blood vessels within the central nervous system. Primary vasculitis is usually caused by autoimmune or idiopathic factors, while secondary vasculitis is caused by existing disease process. Clinical manifestations are highly variable but include HEADACHE; SEIZURES; behavioral alterations; INTRACRANIAL HEMORRHAGES; TRANSIENT ISCHEMIC ATTACK; and BRAIN INFARCTION. (From Adams et al., Principles of Neurology, 6th ed, pp856-61)
A chronic inflammatory process that affects the AORTA and its primary branches, such as the brachiocephalic artery (BRACHIOCEPHALIC TRUNK) and CAROTID ARTERIES. It results in progressive arterial stenosis, occlusion, and aneurysm formation. The pulse in the arm is hard to detect. Patients with aortitis syndrome often exhibit retinopathy.
A method in which either the observer(s) or the subject(s) is kept ignorant of the group to which the subjects are assigned.
An abnormal balloon- or sac-like dilatation in the wall of the THORACIC AORTA. This proximal descending portion of aorta gives rise to the visceral and the parietal branches above the aortic hiatus at the diaphragm.
Microsurgical revascularization to improve intracranial circulation. It usually involves joining the extracranial circulation to the intracranial circulation but may include extracranial revascularization (e.g., subclavian-vertebral artery bypass, subclavian-external carotid artery bypass). It is performed by joining two arteries (direct anastomosis or use of graft) or by free autologous transplantation of highly vascularized tissue to the surface of the brain.
The formation of an area of NECROSIS in the CEREBRUM caused by an insufficiency of arterial or venous blood flow. Infarcts of the cerebrum are generally classified by hemisphere (i.e., left vs. right), lobe (e.g., frontal lobe infarction), arterial distribution (e.g., INFARCTION, ANTERIOR CEREBRAL ARTERY), and etiology (e.g., embolic infarction).
Bleeding into the intracranial or spinal SUBARACHNOID SPACE, most resulting from INTRACRANIAL ANEURYSM rupture. It can occur after traumatic injuries (SUBARACHNOID HEMORRHAGE, TRAUMATIC). Clinical features include HEADACHE; NAUSEA; VOMITING, nuchal rigidity, variable neurological deficits and reduced mental status.
Blocking of the PULMONARY ARTERY or one of its branches by an EMBOLUS.
Pathological processes involving any part of the AORTA.
Aneurysm caused by a tear in the TUNICA INTIMA of a blood vessel leading to interstitial HEMORRHAGE, and splitting (dissecting) of the vessel wall, often involving the AORTA. Dissection between the intima and media causes luminal occlusion. Dissection at the media, or between the media and the outer adventitia causes aneurismal dilation.
NECROSIS occurring in the MIDDLE CEREBRAL ARTERY distribution system which brings blood to the entire lateral aspects of each CEREBRAL HEMISPHERE. Clinical signs include impaired cognition; APHASIA; AGRAPHIA; weak and numbness in the face and arms, contralaterally or bilaterally depending on the infarction.
The region of the lower limb in animals, extending from the gluteal region to the FOOT, and including the BUTTOCKS; HIP; and LEG.
Use of a balloon catheter for dilation of an occluded artery. It is used in treatment of arterial occlusive diseases, including renal artery stenosis and arterial occlusions in the leg. For the specific technique of BALLOON DILATION in coronary arteries, ANGIOPLASTY, BALLOON, CORONARY is available.
The vessels carrying blood away from the heart.
Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990)
A diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI. The degree of molecular movement can be measured by changes of apparent diffusion coefficient (ADC) with time, as reflected by tissue microstructure. Diffusion MRI has been used to study BRAIN ISCHEMIA and tumor response to treatment.
The short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
A birth defect characterized by the narrowing of the AORTA that can be of varying degree and at any point from the transverse arch to the iliac bifurcation. Aortic coarctation causes arterial HYPERTENSION before the point of narrowing and arterial HYPOTENSION beyond the narrowed portion.
Lack of perfusion in the EXTREMITIES resulting from atherosclerosis. It is characterized by INTERMITTENT CLAUDICATION, and an ANKLE BRACHIAL INDEX of 0.9 or less.
An abnormal balloon- or sac-like dilatation in the wall of the ABDOMINAL AORTA which gives rise to the visceral, the parietal, and the terminal (iliac) branches below the aortic hiatus at the diaphragm.
Surgical insertion of BLOOD VESSEL PROSTHESES to repair injured or diseased blood vessels.
A hypoperfusion of the BLOOD through an organ or tissue caused by a PATHOLOGIC CONSTRICTION or obstruction of its BLOOD VESSELS, or an absence of BLOOD CIRCULATION.
The aorta from the DIAPHRAGM to the bifurcation into the right and left common iliac arteries.
Operative procedures for the treatment of vascular disorders.
Pathological outpouching or sac-like dilatation in the wall of any blood vessel (ARTERIES or VEINS) or the heart (HEART ANEURYSM). It indicates a thin and weakened area in the wall which may later rupture. Aneurysms are classified by location, etiology, or other characteristics.
The portion of the descending aorta proceeding from the arch of the aorta and extending to the DIAPHRAGM, eventually connecting to the ABDOMINAL AORTA.
The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.
The flow of BLOOD through or around an organ or region of the body.
Surgical excision, performed under general anesthesia, of the atheromatous tunica intima of an artery. When reconstruction of an artery is performed as an endovascular procedure through a catheter, it is called ATHERECTOMY.
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.
Criteria and standards used for the determination of the appropriateness of the inclusion of patients with specific conditions in proposed treatment plans and the criteria used for the inclusion of subjects in various clinical trials and other research protocols.
NMR spectroscopy on small- to medium-size biological macromolecules. This is often used for structural investigation of proteins and nucleic acids, and often involves more than one isotope.
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.
Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)
The return of a sign, symptom, or disease after a remission.
Device constructed of either synthetic or biological material that is used for the repair of injured or diseased blood vessels.
A graphic means for assessing the ability of a screening test to discriminate between healthy and diseased persons; may also be used in other studies, e.g., distinguishing stimuli responses as to a faint stimuli or nonstimuli.
Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
The measurement of visualization by radiation of any organ after a radionuclide has been injected into its blood supply. It is used to diagnose heart, liver, lung, and other diseases and to measure the function of those organs, except renography, for which RADIOISOTOPE RENOGRAPHY is available.
A proteolytic enzyme in the serine protease family found in many tissues which converts PLASMINOGEN to FIBRINOLYSIN. It has fibrin-binding activity and is immunologically different from UROKINASE-TYPE PLASMINOGEN ACTIVATOR. The primary sequence, composed of 527 amino acids, is identical in both the naturally occurring and synthetic proteases.
The main artery of the thigh, a continuation of the external iliac artery.
Injections made into a vein for therapeutic or experimental purposes.
Disease having a short and relatively severe course.
Studies determining the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies. For drugs and devices, CLINICAL TRIALS AS TOPIC; DRUG EVALUATION; and DRUG EVALUATION, PRECLINICAL are available.
A biosensing technique in which biomolecules capable of binding to specific analytes or ligands are first immobilized on one side of a metallic film. Light is then focused on the opposite side of the film to excite the surface plasmons, that is, the oscillations of free electrons propagating along the film's surface. The refractive index of light reflecting off this surface is measured. When the immobilized biomolecules are bound by their ligands, an alteration in surface plasmons on the opposite side of the film is created which is directly proportional to the change in bound, or adsorbed, mass. Binding is measured by changes in the refractive index. The technique is used to study biomolecular interactions, such as antigen-antibody binding.
Narrowing or constriction of a coronary artery.
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)
Computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures.
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.
The main trunk of the systemic arteries.
Minimally invasive procedures guided with the aid of magnetic resonance imaging to visualize tissue structures.
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.

Magnetic resonance angiography versus duplex sonography for diagnosing renovascular disease. (1/2878)

Noninvasive testing for renovascular disease is required to identify patients who may benefit from revascularization procedures without exposing an unnecessary amount of patients to the risks of catheter angiography. All available methods of diagnosing renal artery stenosis have significant limitations. We compared a new technique, contrast-enhanced magnetic resonance angiography, with an established technique, duplex ultrasonography, for the detection of renal artery stenosis using catheter angiography as the standard of reference. Eighty-nine patients with clinically suspected renovascular disease underwent duplex renal scanning and contrast-enhanced magnetic resonance angiography. Sixty of these also underwent catheter angiography. All studies were interpreted for the presence of renal artery stenosis blinded to the results of the other imaging modalities. For detection of hemodynamically significant (>/=60% diameter reduction) main renal artery stenosis, sensitivity and specificity were 90% and 86%, respectively, for magnetic resonance angiography and 81% and 87% for duplex sonography. Most false readings involved differential grading of stenoses detected with all 3 techniques. When patients with fibromuscular dysplasia were excluded from the analysis, the sensitivity of magnetic resonance angiography increased to 97%, with a negative predictive value of 98%. Magnetic resonance angiography detected 96% and duplex 5% of accessory renal arteries seen at catheter angiography. Contrast-enhanced magnetic resonance angiography is a useful technique for diagnosing atherosclerotic renovascular disease. It overcomes the major limitations of duplex renal scanning. However, duplex has the advantage of providing hemodynamic information and appears better suited for the assessment of patients with suspected fibromuscular dysplasia.  (+info)

Evaluation of cerebral aneurysms with high-resolution MR angiography using a section-interpolation technique: correlation with digital subtraction angiography. (2/2878)

BACKGROUND AND PURPOSE: The objective was to evaluate the results of high-resolution, fast-speed, section-interpolation MR angiography and digital subtraction angiography (DSA), thereby examining the potential use of a primary noninvasive screening test for intracranial aneurysms. METHODS: The images were obtained in 39 cerebral aneurysmal lesions from 30 patients with a time-of-flight MR angiographic technique using a 1.5-T superconducting MR system. The total image volume was divided into four slabs, with 48 partitions each. To save time, only 24 phase-encoded steps were measured and interpolated to 48. The parameters used included 30/6.4 (TR/TE), a flip angle of 25 degrees , a 160x512 matrix, a field of view of 150x200, 7 minutes 42 seconds of scan time, an effective thickness of 0.7 mm, and an entire thickness of 102.2 mm. Maximum intensity projection was used for the image analysis, and a multiplanar reconstruction technique was used for patients with intracranial aneurysms. RESULTS: Among 39 intracranial aneurysmal lesions in 30 patients, 21 were ruptured and 18 were unruptured. Twelve lesions were less than 2 mm in size, 12 were 3 to 5 mm, 12 were 6 to 9 mm, and three were larger than 10 mm. At initial examinations, 38 of 39 aneurysmal lesions were detected by both MR angiography and DSA, with 97% sensitivity. In confirming aneurysms in neck and parent vessels, multiplanar reconstruction was successful in detecting all 39 aneurysms, whereas MR angiography was successful in detecting 27 (69%) and DSA was successful in detecting 32 (82%) of the lesions. CONCLUSION: High-resolution MR angiography with a section-interpolation technique showed equal results to those of DSA for the detection of intracranial aneurysms and may be used as a primary noninvasive screening test. In the evaluation of aneurysms in neck and parent vessels, the concurrent use of MR angiography and multiplanar reconstruction was far superior to the use of either MR angiography or DSA alone.  (+info)

Use of three-dimensional MR angiography for tracking a contrast bolus in the carotid artery. (3/2878)

Contrast-bolus tracking in the carotid bifurcation was accomplished using an MR angiographic technique with a 3D turbo field-echo readout (TR/TE = 6/3, flip angle = 50 degrees) modified by a keyhole scheme. Optimal visibility of the contrast bolus was achieved by digital subtraction from a reference volume. This technique reliably time-resolves the carotid arteries from the jugular veins.  (+info)

Helical CT angiography: dynamic cerebrovascular imaging in children. (4/2878)

BACKGROUND AND PURPOSE: The purpose of this study was to assess the feasibility of helical CT cerebrovascular imaging (CTCVI) in children and to make initial comparisons with MR angiography and digital subtraction angiography (DSA). METHODS: Twenty-six patients, ages 3 days to 17 years, were examined with CTCVI. Patients were scanned with 1-mm collimation and 2:1 pitch 30 seconds after the initiation of a hand injection of 2 mL/kg nonionic contrast material (320 mg/dL iodine) with a maximum dose that did not exceed 80 mL (minimum volume, 5 mL in a 2.5-kg infant). Reconstructions were done using maximum intensity projection and integral rendering algorithms. Four patients had CTCVI, MR angiography, and DSA (42 vessels studied) and nine patients had CTCVI and DSA (136 vessels studied). Scores of 1 (not present) to 3 (present in continuity to the first bifurcation) were assigned independently by two radiologists to 32 vessels in each correlated case for each available technique. RESULTS: There were no technical failures. CTCVI depicted 18 thrombosed dural sinuses, three vascular malformations, one intracranial aneurysm, and four tumors. Ninety-five percent of the vessels seen with DSA were also seen with CTCVI. CTCVI identified all vessels seen on MR angiography. CONCLUSION: Helical CTCVI is an effective technique for assessing the intracranial circulation in children. In this initial comparison, CTCVI showed more vascular detail than MR angiography, and had fewer technical limitations.  (+info)

Spiral computed tomographic scanning and magnetic resonance angiography for the diagnosis of pulmonary embolism. (5/2878)

PURPOSE: To compare prospectively the accuracy of spiral computed tomography (CT) with that of ventilation-perfusion scintigraphy for diagnosing pulmonary embolism. MATERIALS AND METHODS: Within 48 hours of presentation, 142 patients suspected of having pulmonary embolism underwent spiral CT, scintigraphy, and (when indicated) pulmonary angiography. Pulmonary angiography was attempted if interpretations of spiral CT scans and of scintigrams were discordant or indeterminate and intermediate-probability, respectively. RESULTS: In the 139 patients who completed the study, interpretations of spiral CT scans and of scintigrams were concordant in 103 patients (29 with embolism, 74 without). In 20 patients, intermediate-probability scintigrams were interpreted (six with embolism at angiography, 14 without); diagnosis with spiral CT was correct in 16. Interpretations of spiral CT scans and those of scintigrams were discordant in 12 cases; diagnosis with spiral CT was correct in 11 cases and that with scintigraphy was correct in one. Spiral CT and scintigraphic scans of four patients with embolism did not show embolism. Sensitivities, specificities, and kappa values with spiral CT and scintigraphy were 87%, 95%, and 0.85 and 65%, 94%, and 0.61, respectively. CONCLUSION: In cases of pulmonary embolism, sensitivity of spiral CT is greater than that of scintigraphy. Interobserver agreement is better with spiral CT.  (+info)

Pseudoaneurysm of the vertebral artery. (6/2878)

Pseudoaneurysms of the vertebral artery are rare. Their treatment depends on the location, size, cause, and coexisting injuries. The surgical management of a 22-year-old man who had a large pseudoaneurysm in the 1st portion of the right vertebral artery is described, and an additional 144 cases from the medical literature are briefly reviewed.  (+info)

A new technique of surface anatomy MR scanning of the brain: its application to scalp incision planning. (7/2878)

BACKGROUND AND PURPOSE: Surface anatomy scanning (SAS) is an established technique for demonstrating the brain's surface. We describe our experience in applying SAS with superposition of MR venograms to preoperative scalp incision planning. METHODS: In 16 patients, scalp incision planning was done by placing a water-filled plastic tube at the intended incision site when we performed SAS using half-Fourier single-shot fast spin-echo sequences. Two-dimensional phase-contrast MR angiograms were obtained to demonstrate the cortical veins and then superimposed upon the SAS images. The added images were compared with surgical findings using a four-point grading scale (0 to 3, poor to excellent). RESULTS: In each case, neurosurgeons could easily reach the lesion. Surgical findings correlated well with MR angiogram-added SAS images, with an average score of 2.56. CONCLUSION: Our simple technique is a useful means of preoperatively determining brain surface anatomy and can be used to plan a scalp incision site.  (+info)

Clinical and neuroradiological features of intracranial vertebrobasilar artery dissection. (8/2878)

BACKGROUND AND PURPOSE: We sought to determine the clinical and neuroradiological features of intracranial vertebrobasilar artery dissection. METHODS: The clinical features and MR findings of 31 patients (20 men and 11 women) with intracranial vertebrobasilar artery dissections confirmed by vertebral angiography were analyzed retrospectively. The vertebral angiography revealed the double lumen sign in 11 patients (13 arteries) and the pearl and string sign in 20 patients (28 arteries). RESULTS: The patients ranged in age from 25 to 82 years (mean, 54.8 years). Clinical symptoms due to ischemic cerebellar and/or brain stem lesions were common, but in 3 cases the dissections were discovered incidentally while an unrelated disorder was investigated. Headache, which has been emphasized as the only specific clinical sign of vertebrobasilar artery dissection, was found in 55% of the patients. Intramural hematoma on T1-weighted images has been emphasized as a specific MR finding. The positive rate of intramural hematoma was 32%. Double lumen on 3-dimensional (3-D) spoiled gradient-recalled acquisition (SPGR) images after the injection of contrast medium was identified in 87% of the patients. The 3-D SPGR imaging method is considered useful for the screening of vertebrobasilar artery dissection. CONCLUSIONS: Intracranial vertebrobasilar artery dissection is probably much more frequent than previously considered. Such patients may present no or only minor symptoms. Neuroradiological screening for posterior circulation requires MR examinations, including contrast-enhanced 3-D SPGR. Angiography may be necessary for the definite diagnosis of intracranial vertebrobasilar artery dissection because the sensitivity of the finding of intramural hematoma is not satisfactory.  (+info)

TY - JOUR. T1 - Time-of-flight magnetic resonance angiography of the canine brain at 3.0 Tesla and 7.0 Tesla. AU - Martin-Vaquero, Paula. AU - Da Costa, Ronaldo C.. AU - Echandi, Rita L.. AU - Tosti, Christina L.. AU - Knopp, Michael V.. AU - Sammet, Steffen. PY - 2011/3/1. Y1 - 2011/3/1. N2 - Objective - To evaluate the ability of 2-D time-of-flight (ToF) magnetic resonance angiography (MRA) to depict intracranial vasculature and compare results obtained with 3.0- and 7.0-T scanners in dogs. Animals - 5 healthy Beagles. Procedures - 2-D ToF-MRA of the intracranial vasculature was obtained for each dog by use of a 3.0-T and a 7.0-T scanner. Quantitative assessment of the images was obtained by documentation of the visibility of major arteries comprising the cerebral arterial circle and their branches and recording the number of vessels visualized in the dorsal third of the brain. Qualitative assessment was established by evaluation of overall image quality and image artifacts. Results - Use of ...
In this prospective study, the accuracy of whole-heart coronary MR angiography was evaluated in 131 patients with suspected coronary artery disease. The current MR angiography protocol incorporated several improvements over those used in previous studies. First, MR angiograms were acquired on axial 3-dimensional planes that encompassed the entire heart. Second, the image acquisition window in the cardiac cycle was optimized in each patient to minimize motion blurring caused by cardiac contraction. Using this approach, coronary stenoses with a reference diameter of ≥2 mm were detected with an accuracy of 94% for individual segments and 87% for individual patients.. Coronary MR angiography has been acquired in double-oblique 3-dimensional planes that followed the course of one of the major coronary arteries, necessitating repeated MR acquisitions to cover the entire coronary arteries (1). A steady-state, free-precession MR sequence permitted acquisition of a large 3-dimensional volume covering ...
TY - JOUR. T1 - Three-dimensional time-of-flight MR angiography. T2 - Applications in the abdomen and thorax. AU - Lewin, J. S.. AU - Laub, G.. AU - Hausmann, R.. PY - 1991/1/1. Y1 - 1991/1/1. N2 - The application of three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) angiographic techniques to the vasculature of the abdomen and thorax has not, to the authors knowledge, been previously reported; this is possibly due to the large amount of physiologic motion in these regions along with the anticipated sensitivity of the 3D acquisition scheme to image degradation caused by motion artifact. The authors describe an asymmetric short-echo velocity-compensated 3D TOF technique that minimized the effects of physiologic motion on image quality and provided rapid high-resolution 3D MR arteriograms of the abdomen and thorax. Contiguous 3D volumes were often combined to provide sufficient anatomic coverage. Benefits include high spatial resolution and minimization of signal loss; ...
Additional file 1: of Visualization of coronary arteries in paediatric patients using whole-heart coronary magnetic resonance angiography: comparison of image-navigation and the standard approach for respiratory motion compensation
TY - JOUR. T1 - Synergistic role of susceptibility-weighted imaging with diffusion-weighted imaging and magnetic resonance angiography in the evaluation of acute arterial stroke. AU - Rai, Santosh P.V.. AU - Sanyal, Pulastya. AU - Pai, Shivananda. AU - Achappa, Basavaprabhu. AU - Madi, Deepak. AU - MR, Pavan. PY - 2019/5/1. Y1 - 2019/5/1. N2 - Objective: This study was performed to investigate whether diffusion-weighted imaging (DWI) and susceptibility-weighted imaging (SWI) are more effective than conventional imaging modalities for evaluation of stroke and selection of candidates for thrombolytic therapy. Methods: Eighty patients who presented within 12 hours of onset of symptoms of brain ischemia underwent 1.5T magnetic resonance imaging. DWI and SWI were compared with conventional sequences (T1, T2, and fluid-attenuated inversion recovery [FLAIR]) and time-of-flight magnetic resonance angiography (TOF-MRA) to assess factors that affect stroke management and prognosis. Results: The volume of ...
Bruehschwein A, Foltin I, Flatz K, et al. Vet Radiol Ultrasound 2010;51:116-121. Computed tomography angiography, sonography, scintigraphy, and portography can be used to evaluate the portal vasculature to evaluate for a portosystemic shunt (PSS). Time-of-flight magnetic resonance angiography (TOF-MRA) and … Read More
TY - JOUR. T1 - Acceleration apportionment. T2 - A method of improved 2D SENSE acceleration applied to 3D contrast-enhanced MR angiography. AU - Weavers, Paul T.. AU - Borisch, Eric A.. AU - Johnson, Casey P.. AU - Riederer, Stephen J.. N1 - Copyright: Copyright 2020 Elsevier B.V., All rights reserved.. PY - 2014/2. Y1 - 2014/2. N2 - Purpose In 2D SENSE-accelerated 3D Cartesian acquisition, the net acceleration factor R is the product of the two individual accelerations, R = RY × RZ. Acceleration Apportionment tailors acceleration parameters (RY, RZ) to improve parallel imaging performance on a patient- and coil-specific basis and is demonstrated in contrast-enhanced MR angiography. Methods A performance metric is defined based on coil sensitivity information which identifies the (RY, R Z) pair that optimally trades off image quality with scan time reduction on a patient-specific basis. Acceleration Apportionment is evaluated using retrospective analysis of contrast-enhanced MR angiography ...
Contrast-enhanced computed tomography angiography is usually valuable for the evaluation of clipped cerebral aneurysm, but it has side effects of contrast medium. Time-of-flight magnetic resonance angiography (MRA) is a non-invasive and fast method. However, clip-induced artifact limits assessment of the artery in the vicinity of a clip. MRA with ultrashort echo time (TE) reduces metal artifact. We use MAGNETOM Aera 1.5T (SIEMENS, München, Germany) and perform pointwise encoding time reduction with radial acquisition (PETRA)-MRA using ultrashort TE for the assessment of the cerebral aneurysm after clipping. We, herein, presented two representative cases with a clipped aneurysm which could be evaluated by PETRA- MRA. Especially in one of them, the neck remnant was revealed by PETRA-MRA. PETRA-MRA can reduce the time and the invasiveness and may be helpful for the usual follow-up of the clipped aneurysm with the development of MRA technology in the future.. Keywords: Cerebral aneurysm, Clipping, ...
TY - JOUR. T1 - High-resolution steady-state free precession coronary magnetic resonance angiography within a breath-hold. T2 - Parallel imaging with extended cardiac data acquisition. AU - Park, Jaeseok. AU - Larson, Andrew C.. AU - Zhang, Qiang. AU - Simonetti, Orlando. AU - Li, Debiao. PY - 2005/11. Y1 - 2005/11. N2 - Coronary artery imaging data are conventionally acquired in a single imaging frame during mid-diastole. The data acquisition window must be sufficiently short to avoid cardiac motion artifacts. A short data acquisition window results in decreased imaging efficiency and limited spatial resolution. Parallel imaging may lessen these limitations, but requires highly accurate coil sensitivity. The purpose of this work was to increase the imaging efficiency and spatial resolution in coronary artery imaging using parallel imaging with an extended acquisition window. External coil calibration data were acquired before and after a short mid-diastolic period of accelerated imaging data ...
Yang Q, Li K, Liu X, Bi X, Liu Z, An J, Zhang A, Jerecic R, Li D. Contrast-enhanced whole-heart coronary magnetic resonance angiography at 3.0-T: a comparative study with X-ray angiography in a single center. J Am Coll Cardiol. 2009 Jun 30;54(1):69-76 ...
Aims For catheter ablation of atrial fibrillation (AF), proper catheter positioning is crucial and depends on knowledge of pulmonary vein (PV) anatomy. The aim of this study was to assess PV spatial orientation and ostial shape by contrast-enhanced magnetic resonance angiography (CE-MRA).. Methods and results In 30 consecutive AF patients, CE-MRA was performed prior to ostial ablation. Using a centre-line technique, the PV ostium was defined perpendicular to this centre-line. Minimal and maximal ostial diameters, ostial perimeter, and angles in the anatomical frontal and transverse planes were measured. Twenty-one patients had four separate PVs. In four patients, there was a distinct right-middle PV and in five a common left common PV was found. Left-sided PV ostia were smaller and more elliptical than right-sided PVs. In the transverse plane, the ostia of both superior PVs were directed anteriorly (LS −15±13°, RS −13±11°) and both inferior PV ostia were directed posteriorly (LI ...
Contrast-enhanced magnetic resonance angiography in rabbits: evaluation of the gadolinium-based agent p846 and the iron-based blood pool agent p904 in compariso
TY - JOUR. T1 - Velocity-coded colour magnetic resonance angiography and perfusion-weighted magnetic resonance imaging for the evaluation of extracranial-to-intracranial arterial bypass surgery. AU - Miyazawa, Nobuhiko. AU - Aoki, Shigeki. AU - Toyama, Keiji. AU - Arbab, Ali Syed. AU - Hori, Masaaki. AU - Umeda, Takako. AU - Araki, Tsutomu. AU - Nukui, Hideaki. PY - 2002/12/1. Y1 - 2002/12/1. N2 - Background and purpose: Velocity-coded colour magnetic resonance angiography (VCCMRA) and perfusion magnetic resonance imaging (pMRI) were evaluated as methods for investigating the efficacy of extracranial-to-intracranial arterial bypass (EC-IC bypass) by comparing the findings of VCCMRA and those of cerebral angiography and by measuring the improvement ratio after EC-IC bypass by pMRI compared to that by single photon emission computed tomography (SPECT) using the autoradiographic technique. Methods: Thirteen patients who underwent VCCMRA, angiography, SPECT, and pMRI before and after surgery were ...
To evaluate the relationship between the flow signal intensity of branch arteries distal to the stenosis on 3-dimensional (3D) time-of-flight (TOF) magnetic resonance angiography (MRA) and the risk of stroke recurrence in patients with severe middle cerebral artery (MCA) trunk stenosis. We prospectively recruited 153 patients (mean age 62.9 ± 13.0 years, 106 males) with a first ischemic stroke or transient ischemic attack caused by a severe MCA trunk stenosis (70 % to 99 %) confirmed by 3D TOF MRA and followed them for one year to determine the stroke recurrence. The MCA branch signal intensity distal to the site of stenosis on 3D TOF MRA was classified as either good (grade A) or poor [mild reduction (grade B) or severe reduction (grade C)] according to the extent to which the MCA could be visualized. The patients were divided into groups A (35), B (58), or C (60) based on the MRA grading of the MCA branch signal intensity distal to the site of stenosis. Poor MCA branch signal intensity was associated
To evaluate the relationship between the flow signal intensity of branch arteries distal to the stenosis on 3-dimensional (3D) time-of-flight (TOF) magnetic resonance angiography (MRA) and the risk of stroke recurrence in patients with severe middle cerebral artery (MCA) trunk stenosis. We prospectively recruited 153 patients (mean age 62.9 ± 13.0 years, 106 males) with a first ischemic stroke or transient ischemic attack caused by a severe MCA trunk stenosis (70 % to 99 %) confirmed by 3D TOF MRA and followed them for one year to determine the stroke recurrence. The MCA branch signal intensity distal to the site of stenosis on 3D TOF MRA was classified as either good (grade A) or poor [mild reduction (grade B) or severe reduction (grade C)] according to the extent to which the MCA could be visualized. The patients were divided into groups A (35), B (58), or C (60) based on the MRA grading of the MCA branch signal intensity distal to the site of stenosis. Poor MCA branch signal intensity was associated
TY - JOUR. T1 - Temporal profile of the vascular anatomy evaluated by 9.4-T magnetic resonance angiography and histopathological analysis in mice lacking RNF213. T2 - A susceptibility gene for moyamoya disease. AU - Sonobe, Shinya. AU - Fujimura, Miki. AU - Niizuma, Kuniyasu. AU - Nishijima, Yasuo. AU - Ito, Akira. AU - Shimizu, Hiroaki. AU - Kikuchi, Atsuo. AU - Arai-Ichinoi, Natsuko. AU - Kure, Shigeo. AU - Tominaga, Teiji. PY - 2014/3/13. Y1 - 2014/3/13. N2 - Moyamoya disease (MMD) is a chronic occlusive cerebrovascular disease with unknown etiology. Recent genome-wide and locus-specific association studies identified RNF213 as an important MMD susceptibility gene. However, the exact mechanism by which an abnormality in RNF213 leads to MMD is unknown. To evaluate the role of RNF213 in the etiology of MMD, we generated RNF213-deficient mice (RNF213-/-) by deleting exon 32 of RNF213 by the Cre-lox system, and investigated whether they developed MMD. The temporal profile of cervical/intracranial ...
TY - JOUR. T1 - Diagnostic value of gadolinium-enhanced 3D magnetic resonance angiography in patients with suspected hepatic arterial complications after liver transplantation. AU - Ishigami, Kousei. AU - Stolpen, Alan H.. AU - Hanna Al-Kass, Faraj M.. AU - Zhang, Yan. AU - Rayhill, Stephen C.. AU - Katz, Daniel A.. AU - Abu-Yousef, Monzer. PY - 2005/7/1. Y1 - 2005/7/1. N2 - Purpose: To evaluate the accuracy and clinical role of gadolinium-enhanced 3D magnetic resonance angiography (MRA) in patients with suspected hepatic arterial complications after liver transplantation. Materials and Methods: Thirty-six consecutive MRA studies were performed in 33 liver transplant recipients after transplantation. MRA image quality was assessed subjectively. Thirty-two MRA studies were retrospectively reviewed and correlated with surgery (n = 2), conventional angiography (n = 18), or clinical follow-up (n = 12). MRA findings were also correlated with those of Doppler sonography in 30 of the cases. In 20 ...
BACKGROUND AND PURPOSE: We attempted to evaluate the location of vascular lesions in cases of cerebrovascular steno-occlusive diseases in Chinese persons living in Taiwan. METHODS: With three-dimensional time-of-flight magnetic resonance angiography (MRA) as a screening tool, 108 symptomatic patients with cerebrovascular steno-occlusive diseases were examined. Cardioembolic disease and cerebral hemorrhage ...
TY - JOUR. T1 - Intraindividual comparison of high-spatial-resolution abdominal MR angiography at 1.5 T and 3.0 T. T2 - Initial experience. AU - Michaely, Henrik J.. AU - Kramer, Harald. AU - Dietrich, Olaf. AU - Nael, Kambiz. AU - Lodemann, Klaus Peter. AU - Reiser, Maximilian F.. AU - Schoenberg, Stefan O.. PY - 2007/9/1. Y1 - 2007/9/1. N2 - Purpose: To prospectively compare three-dimensional (3D) contrast material-enhanced abdominal magnetic resonance (MR) angiography at 1.5 and 3.0 T intraindividually in healthy volunteers. Materials and Methods: After institutional review board approval and informed consent were obtained, 15 healthy male volunteers (age range, 24-41 years) underwent one abdominal 3D contrast-enhanced MR angiographic examination each at 1.5 and 3.0 T in random order. Fast 3D gradient-echo sequence with parallel imaging acceleration factor of three was used for MR angiography; acquired spatial resolutions were 1 x 0.8 x 1 mm3 (imaging time, 19 seconds) at 1.5 T and 0.9 x 0.8 ...
MRI (Magnetic Resonance Imaging) White Plains - MRI (Magnetic Resonance Imaging), Magnetic Resonance Angiography (MRA), Magnetic Resonance Venography (MRV) and other services which are offered at Hartsdale Imaging serving White Plains, Yonkers and the surrounding area.
TY - JOUR. T1 - Peripheral contrast-enhanced MR angiography at 3.0T, improved spatial resolution and low dose contrast. T2 - Initial clinical experience. AU - Nael, Kambiz. AU - Krishnam, Mayil. AU - Nael, Ali. AU - Ton, Anthony. AU - Ruehm, Stefan G.. AU - Finn, J. Paul. PY - 2008/7/14. Y1 - 2008/7/14. N2 - To investigate a high spatial resolution peripheral contrast-enhanced MR angiography (CE-MRA) protocol, applying a dedicated multi-channel array coil and accelerated parallel acquisition at 3.0T in evaluation of patients with peripheral vascular disease. Twenty patients with peripheral vascular disease underwent multi-station high spatial resolution peripheral CE-MRA at 3T. The image quality, presence of venous contamination, image noise, and artifact were evaluated by 2 radiologists independently. Assessment of arterial disease for 540 arterial segments was performed, and findings were correlated with conventional catheter angiography in 10 patients. All studies were yielded high diagnostic ...
0006] There are many conventional techniques to suppress venous contamination. (See, for example, (1) Lee et al., Distal lower extremity arteries: evaluation with two-dimensional MR digital subtraction angiography, Radiology. 1998 May, 207(2):505-12; (2) Maki et al., Utilizing SENSE to achieve lower station sub-millimeter isotropic resolution and minimal venous enhancement in peripheral MR angiography, JMRI, 2002 April, 15(4):484-91; (3) Ho et al., High-spatial-resolution multistation MR imaging of lower-extremity peripheral vasculature with segmented volume acquisition: feasibility study, Radiology 2001 June, 219(3):835-41; (4) Leiner et al., Three-dimensional contrast-enhanced moving-bed infusion-tracking (MoBi-track) peripheral MR angiography with flexible choice of imaging parameters for each field of view JMRI, 2000 April, 11(4):368-77; (5) Wentz et al., High-resolution magnetic resonance angiography of hands with timed arterial compression (tac-MRA) Lancet 2003, 36149-50; (6) ...
Atherosclerosis of the lower leg arteries is a common disease. Patients with this condition has symptoms of ischemia, for instance intermittent claudication (pain during exercise). Diagnosis of atherosclerosis in the legs is normally done with an interventional x-ray-based angiography (DSA- digital subtraction angiography). This is uncomfortable for the patient, and associated with risks of complications (bleeding, vascular damage, embolism).A novel approach to diagnosing atherosclerosis is the use of magnetic resonance angiography. A variant of this is the whole body magnetic resonance angiography(WB-MRA), that produce a picture of the arteries in almost the whole body (excluding the coronary arteries). WB-MRA has a number of advantages compared to DSA. It does not use ionizing radiation, is not invasive, uses a contrast medium with fewer side affects and finally gives a covers a great deal of the arteries in the body.. This study will compare WB-MRA with DSA in patients with symptoms of ...
Neurosurgery 81:688-695, 2017. Stereoelectroencephalography (SEEG) requires high-quality angiographic studies because avascular trajectory planning is a prerequisite for the safety of this procedure. Some epilepsy surgery groups have begun to use computed tomography angiography and magnetic resonance T1-weighted sequence with contrast enhancement for this purpose.. OBJECTIVE: To present the first series of patients with avascular trajectory planning of SEEG based on magnetic resonance angiography (MRA).. METHODS: Thirty-six SEEG explorations for drug-resistant focal epilepsy were performed from January 2013 to December 2015. A retrospective analysis of this consecutive surgical series was then performed. Magnetic resonance imaging included MRA with a modified contrast-enhanced magnetic resonance venography (MRV) protocol with a short acquisition delay, which allowed simultaneous arterial and venous visualization. Our criteria for satisfactoryMRAwere the visualization of at least first-order ...
Methods and Results-Two-dimensional black-blood coronary wall magnetic resonance imaging and 3-dimensional whole-heart coronary magnetic resonance angiography were performed on 130 participants (65-84 years), including 65 hypertensive patients and 65 healthy controls. Coronary segments derived from hypertensive participants had a higher mean coronary wall thickness, a smaller vessel area, a smaller coronary wall area, a smaller lumen area, a lower coronary distensibility index, and a higher percent of the coronary wall occupying the vessel area (PWOV) than those from healthy controls. When the average PWOV was set as an ad hoc cutoff point, coronary segments with a high PWOV had a significantly higher mean wall thickness, a higher maximum wall thickness, a smaller vessel area, a smaller lumen area, a higher coronary distensibility index, and a lower coronary plaque index compared with coronary segments with a low PWOV.. ...
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TY - JOUR. T1 - 4D radial contrast-enhanced MR angiography with sliding subtraction. AU - Cashen, Ty A.. AU - Jeong, Hyun. AU - Shah, Maulin K.. AU - Bhatt, Hem M.. AU - Shin, Wanyong. AU - Carr, James C.. AU - Walker, Matthew T.. AU - Batjer, H. Hunt. AU - Carroll, Timothy J.. PY - 2007/11/1. Y1 - 2007/11/1. N2 - A method is presented for high spatial and temporal resolution 3D contrast-enhanced magnetic resonance angiography. The overall technique involves a set of interrelated components suited to high-frame-rate angiography, including 3D cylindrical k-space sampling, angular undersampling, asymmetric sampling, sliding window reconstruction, pseudorandom view ordering, and a sliding subtraction mask. Computer simulations and volunteer studies demonstrated the utility of each component of the technique. Angiograms of one hemisphere of the intracranial vasculature were acquired with a pixel size of 1.1 x 1.1 x 2.8 mm and a frame rate of 0.35 sec based on a temporal resolution of 3.5 sec. Such a ...
Twenty-two patients (64 ± 10.2 years) with suspected coronary artery disease underwent cardiac MR examination at 3 T (MAGNETOM Tim Trio, Siemens, Germany) after informed consent was obtained. Coronary arteries were imaged using an ECG-triggered, navigator-gated, inversion-recovery, segmented gradient-echo sequence with isotropic whole-heart coverage. A twelve-element matrix coil (six anterior and six posterior) was used for data acquisition. To speed up data acquisition, parallel acquisition (GRAPPA) was used in the phase-encoding direction with an acceleration factor of two. Imaging parameters included: voxel size 0.65 × 0.65 × 0.65 mm3 (interpolated from 1.3 × 1.3 × 1.3 mm3), TR/TE = 3.3/1.5 msec, flip angle = 20°, bandwidth = 700 Hz/pixel, imaging time = 8.8 ± 1.9 min. Contrast agent (0.2 mmol/kg body weight, Multihance, Bracco Imaging SpA, Italy) was intravenously administered at the rate of 0.3 ml/sec using a Medrad power injector. All patients received x-ray angiography (CAG) within ...
Background The combination of coronary MR angiography (CMRA) with cine- and late gadolinium-enhanced (LGE)-MRI provides a comprehensive assessment of coronary artery disease (CAD). However, prognostic value of CMRA compared to cine- or LGE-MRI has not been evaluated. We sought to study the independent and incremental prognostic value of CMRA over clinical variables, left ventricular ejection fraction (LVEF), and presence of LGE.. Methods Cine-, LGE-MRI, and whole-heart CMRA were acquired by using 1.5T MR system and 32 channel cardiac coils in 196 patients (mean age, 68 ± 11; male 60%) with suspected CAD but without known CAD. LVEF was measured from cine MRI, and LGE and significant coronary stenosis (diameter stenosis ≥ 50%) were determined from LGE-MRI and CMRA, respectively. Major adverse cardiac events (MACEs) were defined as cardiac death, acute myocardial infarction, unstable angina, heart failure, and ventricular arrhythmia.. Results During a median follow-up period of 25 months ...
Carotid and intracranial stenosis are responsible for stroke, which is the third leading cause of death globally. Carotid and intracranial stenting are used in management of stenosis. In-stent stenosis occurs in 25-35% of patients. Stent related artifacts and artificial lumen narrowing are problems during MRI scanning. A potential solution is estimate the flow profile across stenosis. The goal of this project is to optimize and implement quantitative magnetic resonance angiography (QMRA) for flow encoding and flow velocity estimation for better characterizing stenosis and assessing its degrees. We conducted multiple phantom measurements (mimicking normal carotid and middle cerebral anatomy) using phase contrast sequence with implementing different degrees of stenosis. Subsequent volunteer and patients measurements were conducted. In 8 mm tubes, flow was stable till 75 % stenosis while in 4 mm tubes, decline starts at 65% stenosis. In subject measurements, there is flow asymmetry between paired ...
See related article, pages 991-993. Prabhakaran and colleagues describe a promising technique, quantitative MR angiography, as a screening tool for detecting intracranial in-stent stenosis. They looked at 14 patients with intracranial stents and compared quantitative MR angiography and conventional angiography. Using a 20% decrease in quantitative MR angiography vessel flow, they found that low blood flow measured by quantitative MR angiography at sites of intracranial stent placement was significantly associated with in-stent stenosis by catheter-based angiography. The sensitivity, specificity, and negative predictive value are excellent, whereas the positive predictive value was fair. They identified all true cases of in-stent stenosis.1 This article and methodology come at a good time because intracranial stents are increasingly being used for the treatment of aneurysms as well as for treating symptomatic intracranial atherosclerotic disease. Other noninvasive imaging such as MR angiography ...
Coronary MR angiography. Patient with anomalous origin of the right coronary artery from the left aortic sinus of Valsalva. Coronary angiography was performed u
Toda la información sobre las últimas publicaciones científicas de la Clínica Universidad de Navarra. Preoperative planning of DIEP and SGAP flaps: Preliminary experience with magnetic resonance angiography using 3-tesla equipment and blood-pool contrast medium
Magnetic resonance angiography is a test used to discover blocked or abnormal arteries or veins. Learn what to expect during an MRA here at Ohio State.
Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood vessels.
Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood vessels.
Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood vessels.
TY - GEN. T1 - Comparison of automatic vessel segmentation techniques for whole body magnetic resonance angiography with limited ground truth data. AU - McNeil, Andrew. AU - Degano, Giulio. AU - Poole, Ian. AU - Houston, Graeme. AU - Trucco, Emanuele. N1 - © Springer International Publishing AG 2017. PY - 2017. Y1 - 2017. N2 - This work is part of a project aimed at automatically detecting vascular disease in whole body magnetic resonance angiograms (WBMRA). Here we present a comparison of four techniques for automatic artery segmentation in WBMRA data volumes; active contours, two vesselness filter approaches (the Frangi filter and Optimally Oriented Flux (OOF)) and a convolutional neural network (Convnet) trained for voxel-wise classification. Their performance was assessed on three manually segmented WBMRA datasets, comparing the maximum Dice Similarity Coefficient (DSC) achieved by each method. Our results show that, in the presence of limited training data, OOF performs best for our ...
MARACAS (MAgnetic Resonance Angiography Computer ASsisted Analysis) : an interactive software for visualisation and analysis of blood vessels in 3D MRA providing automatic quantification of arterial ...
A 20 year old man was found to be hypertensive on routine screening. Examination revealed an absent right and barely palpable left femoral arterial pulse. Radiofemoral delay was present and pulsations were palpable over both scapulae. Parasaggital gadolinium enhanced magnetic resonance angiography (left) demonstrates a uniform 3 cm narrowing in the proximal descending aorta (d), which terminates in a discrete stricture before returning to a normal calibre (a, ascending aorta). Internal mammary artery hypertrophy is noted in the retrosternal. ...
With the development of medical imaging modalities and image processing algorithms, there arises a need for methods of their comprehensive quantitative evaluation. In particular, this concerns the algorithms for vessel tracking and segmentation in magnetic resonance angiography images. The problem can be approached by using synthetic images, where true geometry of vessels is known. This paper presents a framework for computer modeling of MRA imaging and the results of its validation. A new model incorporates blood flow simulation within MR signal computation kernel. The proposed solution is unique, especially with respect to the interface between flow and image formation processes. Furthermore it utilizes the concept of particle tracing. The particles reflect the flow of fluid they are immersed in and they are assigned magnetization vectors with temporal evolution controlled by MR physics. Such an approach ensures flexibility as the designed simulator is able to reconstruct flow profiles of any ...
Understand the usages of Magnetic Resonance Angiography in various health conditions. Explore other smart treatment options, see research evidence, and find out about peoples experiences with many popular treatments, including feedback from patients and professionals.
Robust motion correction is necessary to minimize respiratory motion artefacts in coronary MR angiography (CMRA). The state-of-the-art method uses a 1D feet-head translational motion correction approach, and data acquisition is limited to a small window in the respiratory cycle, which prolongs the scan by a factor of 2-3. The purpose of this work was to implement 3D affine motion correction for Cartesian whole-heart CMRA using a 3D navigator (3D-NAV) to allow for data acquisition throughout the whole respiratory cycle. ...
Parallel imaging using sophisticated receiver coils has improved the clinical feasibility of magnetic resonance coronary angiography (MRCA). These techniques, however, are not readily available outside advanced imaging centers. Our custom-made 2-element phased array coil is readily and inexpensively assembled to address this limitation and enable the widespread application of MRCA. The 2-element phased array coil, comprised of two 4-inch, overlapping circular coils, is specifically designed for MRCA. We compare our prototype coil to two commercially available coils commonly used for MRCA. MRCA has been performed in 14 normal volunteers. Anatomic coverage, image quality, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) are calculated for each coil. The prototype coil has imaged 92.6% (125/135) of the segments compared to 83.7% (113/135) and 76.3% (103/135) (p = 0.002) using the surface coil and cardiac phased array coil, respectively. Excellent or good (grade 1-2) image quality has ...
TY - JOUR. T1 - Contrast-enhanced MR angiography of the peripheral vasculature with a continuously moving table and modified elliptical centric acquisition. AU - Madhuranthakam, Ananth J.. AU - Hu, Houchun H.. AU - Kruger, David G.. AU - Glockner, James F.. AU - Riederer, Stephen J.. PY - 2006/7. Y1 - 2006/7. N2 - This study was approved by the institutional review board and was HIPAA compliant. All subjects provided written informed consent, and subject confidentiality was protected. The purpose of this study was to prospectively evaluate the feasibility of integrating a modified elliptical centric (EC) acquisition with a continuously moving table technique to acquire high-spatial-resolution contrast material-enhanced magnetic resonance (MR) angiograms of the peripheral vasculature. Incorporation of two-dimensional homodyne reconstruction modified the EC view order, allowing improved spatial resolution per unit time while retaining the advantage of venous suppression intrinsic to the EC ...
It can be argued that magnetic resonance angiography of the aorta and peripheral vessels has undergone more dramatic changes over the last couple decades than any other form of cardiovascular magnetic resonance imaging. The first useful clinical applications primarily used two-dimensional time-of-flight technology. However, in the mid-1990s, this approach was replaced to a large degree by contrast-enhanced techniques using conventional agents in dynamic, multiphase mode. Blood pool agents have also been developed for use in magnetic resonance angiography, but their precise role remains to be determined. Given the risks of gadolinium contrast in patients with renal failure, which is not an unusual concomitant in patients undergoing vascular evaluation, there has been a recent resurgence in interest in the use of non-contrast magnetic resonance angiographic approaches.
Both of these techniques were compared with another imaging technique called X-ray coronary angiography, which acted as the reference standard. In this way, the researchers could directly compare the results of the two scans in a single patient and then turn to X-ray scanning to confirm which was most accurate.. In X-ray coronary angiography, a contrast agent is introduced into the coronary artery and X-ray images are taken. Again, the patient is exposed to ionising radiation and in addition the technique used to introduce the contrast agent is invasive. This is an anatomical test that shows where any narrowed arteries might be.. Patients with suspected disease were randomised into two groups, receiving either CMR before SPECT (prior to confirmation with angiography) or SPECT before CMR (prior to confirmation with angiography). Offering CMR and SPECT in a random order reduces the chances of the results being influenced by bias: for example, the process of performing a scan might potentially ...
RESULTS. There were 27 patients (14 male, 13 female) with a mean age of 62 (range, 44-77) years. There were 10 patients with renal transplants; their native renal arteries were not evaluated. Each of the two experienced interventional and body magnetic resonance radiologists, who were blinded to the results, reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. Digital subtraction angiography was used as the standard of reference. A total of 39 renal arteries from these 27 patients were evaluated. One of the arteries was previously stented and could not be assessed with magnetic resonance angiography due to severe artefacts. Of the remaining 38 renal arteries, two were graded as normal, seven as having mild stenosis (=50% but =75%). Magnetic resonance angiography and digital subtraction angiography were concordant in 89% of the arteries; magnetic resonance angiography overestimated the degree of stenosis in 8% and underestimated it in 3% of them. In ...
A dynamic MR angiography technique, MR digital subtraction angiography (MR DSA), is proposed using fast acquisition, contrast enhancement, and complex subtraction. When a bolus of contrast is injected into a patient, data acquisition begins, dynamically acquiring a thick slab using a fast gradient e …
BACKGROUND AND PURPOSE: Contrast-enhanced MR angiography and extracranial color-coded duplex sonography are noninvasive, preoperative imaging modalities for evaluation of carotid artery stenosis. Innovative techniques and improvements in image quality require frequent reassessment of accuracy, reliability, and diagnostic value compared with those of digital subtraction angiography (DSA). We evaluated contrast-enhanced MR angiography and duplex sonography compared with DSA for detection of high-grade carotid artery stenoses. METHODS: Four readers, blinded to clinical symptoms and the outcome of other studies, independently evaluated stenoses on contrast-enhanced MR angiograms in 71 vessels of 39 symptomatic patients. Duplex sonography was also performed in all vessels. The severity of stenosis was defined according to North American Symptomatic Carotid Endarterectomy Trial criteria (0-29%, 30-69%, 70-99%, 100%). Results of both modalities were compared with the corresponding DSA finding
TY - JOUR. T1 - Peripheral vascular disease. T2 - Blinded study of dedicated calf MR angiography versus standard bolus-chase MR angiography and film hard-copy angiography. AU - Binkert, Christoph A.. AU - Baker, Phillip D.. AU - Petersen, Bryan D.. AU - Szumowski, Jerzy. AU - Kaufman, John A.. PY - 2004/9/1. Y1 - 2004/9/1. N2 - PURPOSE: To compare the accuracy of contrast material-enhanced three-dimensional (3D) dedicated calf magnetic resonance (MR) angiography with that of bolus-chase MR angiography, with conventional angiography as the reference standard, in patients with symptomatic peripheral vascular disease (PVD). MATERIALS AND METHODS: Thirty men with symptomatic PVD were examined. MR angiography was performed at 1.5 T before conventional angiography. MR angiographic examination included 3D contrast-enhanced dedicated calf MR angiography and three-station bolus-chase MR angiography. Two radiologists blinded to conventional angiographic results evaluated the MR angiograms independently. ...
TY - JOUR. T1 - Noninvasive determination of infarct artery patency by cine magnetic resonance angiography. AU - Hundley, W. G.. AU - Clarke, G. D.. AU - Landau, C.. AU - Lange, R. A.. AU - Willard, J. E.. AU - Hillis, L. D.. AU - Peshock, R. M.. PY - 1995. Y1 - 1995. N2 - Background: In survivors of myocardial infarction, restoration of antegrade flow in the infarct artery reduces morbidity and mortality. At present, coronary artery patency must be assessed invasively with contrast angiography. A noninvasive method of evaluating infarct artery patency would be useful in managing survivors of infarction. This study was performed to determine whether magnetic resonance (MR) imaging could reliably assess infarct artery patency in this patient population. Methods and Results: Eighteen survivors of myocardial infarction (11 men and 7 women, aged 35 to 74 years) who were consecutively referred for cardiac catheterization underwent contrast coronary angiography and cine MR coronary angiography. ...
TY - JOUR. T1 - Noninvasive coronary artery imaging. T2 - Magnetic resonance angiography and multidetector computed tomography angiography: A scientific statement from the American Heart Association committee on cardiovascular imaging and intervention of the council on cardiovascular radiology and intervention, and the councils on clinical cardiology and cardiovascular disease in the young. AU - Bluemke, David A.. AU - Achenbach, Stephan. AU - Budoff, Matthew. AU - Gerber, Thomas C.. AU - Gersh, Bernard. AU - Hillis, L. David. AU - Hundley, W. Gregory. AU - Manning, Warren J.. AU - Printz, Beth Feller. AU - Stuber, Matthias. AU - Woodard, Pamela K.. PY - 2008/7/29. Y1 - 2008/7/29. KW - AHA scientific statements. KW - Angiography. KW - Imaging. UR - http://www.scopus.com/inward/record.url?scp=49649104098&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=49649104098&partnerID=8YFLogxK. U2 - 10.1161/CIRCULATIONAHA.108.189695. DO - 10.1161/CIRCULATIONAHA.108.189695. M3 - Review ...
TY - JOUR. T1 - Contrast-enhanced MR angiography for evaluation of vascular complications of the pancreatic transplant. AU - Dobos, Nora. AU - Roberts, David A.. AU - Insko, Erik K.. AU - Siegelman, Evan S.. AU - Naji, Ali. AU - Markmann, James F.. PY - 2005/5. Y1 - 2005/5. N2 - Vascular complications are a common cause of postoperative dysfunction in a pancreatic transplant. Coronal three-dimensional (3D) contrast material-enhanced magnetic resonance (MR) angiography performed with high spatial and temporal resolution is a safe and effective method of assessing these vascular complications. A study was performed of selected patients who had undergone MR imaging and MR angiography during the past 6 years for evaluation of graft dysfunction following pancreatic transplantation. Thrombosis within peripheral stump vessels involving either the arterial or venous segments was a commonly observed vascular complication. Isolated distal arterial stump thrombi are incidental findings that may not require ...
TY - JOUR. T1 - Magnetic resonance angiography in vertebrobasilar ischemia. AU - Verro, Piero. AU - Levine, R. L.. AU - Turski, P. A.. AU - Partington, C.. PY - 1993. Y1 - 1993. UR - http://www.scopus.com/inward/record.url?scp=0027516360&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0027516360&partnerID=8YFLogxK. M3 - Article. C2 - 10148530. AN - SCOPUS:0027516360. VL - 3. SP - 132. EP - 138. JO - Journal of Neuroimaging. JF - Journal of Neuroimaging. SN - 1051-2284. IS - 2. ER - ...
Introduction: Contrast-enhanced MR angiography (CE-MRA) provides highly accurate measurement of carotid stenosis. But non-contrast techniques are desired as contrast agents may lead to anaphylaxis or nephrogenic system fibrosis. Recently, an inversion-recovery gradient echo sequence with phase-sensitive reconstruction was developed for assessment of lumen and intraplaque hemorrhage in one sequence - Simultaneous Noncontrast Angiography and intraPlaque hemorrhage (SNAP).. Hypothesis: We tested the hypothesis that SNAP provides an accurate and reproducible assessment of carotid stenosis compared to CE-MRA.. Methods: Fifty-eight subjects with 16-79% stenosis on ultrasound were scanned using a large-coverage (16 cm), isotropic-resolution (0.8 mm) SNAP sequence. Minimum intensity projections were generated at ten degrees increments to get 3D views of carotid arteries. Carotid stenosis was measured bilaterally according to the NASCET criteria by independent readers to estimate inter-reader ...
Conventional coronary angiography frequently underestimates the true burden of atherosclerosis. As reported by Glagov et al,1 the initial response to endothelial injury and development of atherosclerosis is vessel enlargement, with relative preservation of lumen diameter. Subsequent plaque progression, with lumen-encroachment stenoses, is a later event. Invasive x-ray coronary angiography and bright-blood2 3 coronary magnetic resonance angiography (MRA) only allow for assessment of luminal vessel diameter and do not provide direct information regarding coronary vessel wall thickness or atherosclerotic plaque. Recent intravascular ultrasound (IVUS) studies4 5 have shown that lesion-site cross-sectional area, minimum lesion diameter, cross-sectional narrowing, and area stenosis are good predictors for subsequent acute cardiac events. However, this invasive technique is not appropriate for screening or serial examinations. Apart from plaque burden and luminal encroachment, plaque composition is a ...
In many preliminary and feasibility studies, various contrast-enhanced MR angiorgaphic techniques have been implemented in the assessment of extracranial disease of the carotid artery. Different strategies are used to optimize image quality, including time-resolved and high-resolution techniques. Most of these reports, although based on small numbers of patients, suggest that contrast-enhanced MR angiography could become a diagnostic alternative as a fast, first screening method in patients suspected of having carotid artery disease, independently from the technique employed in the study.. DSA is still considered to be the criterion standard for imaging of arteriosclerotic supraaortic vessel disease. Harboring the risks of thromboembolic events, this technique can reduce the overall benefit of endarterectomy. Noninvasive techniques for imaging supraaortic vessels prevent this risk related to the diagnostic procedure and can be regarded as a safe alternative to DSA whenever possible.. We chose to ...
BACKGROUND: Magnetic resonance (MR)-guided vascular interventions are of increasing interest, and, with the use of contrast-enhanced techniques, intraarterial contrast-enhanced MR angiography (ia-ce-MRA) competes with intraarterial digital subtraction angiography (ia-DSA) for the diagnostic evaluation of the infrainguinal vessel tree. PURPOSE: To assess the diagnostic value of ia-ce-MRA and high-resolution T1-weighted (hr-T1w) imaging compared to the gold-standard ia-DSA for residual stenosis and local dissections after femoropopliteal recanalization in patients with peripheral arterial occlusive disease (PAOD). MATERIAL AND METHODS: Eight patients with PAOD and short vessel occlusion of their femoropopliteal arteries underwent recanalization and balloon positioning under DSA. Patients were transferred to a short-bore MR scanner. Percutaneous transluminal angioplasty (PTA) was accomplished under MR fluoroscopy. Pre- and postinterventional ia-ce three-dimensional (3D) gradient-echo MRA with ...
The authors compared the three-dimensional Fourier transform (3DFT) time-of-flight magnetic resonance (MR) angiograms in 38 patients initially studied with selective intraarterial digital subtraction angiography (DSA) for suspected arteriosclerotic disease of the carotid bifurcation. MR angiograms w …
Transcatheter arterial chemo-embolization (TACE) is a therapeutic procedure to treat primary and metastatic liver cancer. It requires prior delineation of the hepatic arteries on magnetic resonance angiography (MRA) data and identification of the vessels supplying the tumor. Manual segmentation is extremely challenging and time consuming, thereby increasing the risk of wrongfully identifying the feeding vessels. We present a vascular path planning tool for TACE procedures by automatically segmenting the hepatic arteries on MRA. The proposed method first detects the celiac trunk from the aorta, then localizes and tags bifurcations throughout the arterial network for path planning. The algorithm is based on a multiple hypothesis tracking approach used to propagate deformable mesh surfaces. We validated the proposed framework on 20 liver-cancer-patients using abdominal MRA with 20 seconds delay after contrast injection. We show that the algorithm improves the selectivity of the arterial segments ...
Focal damage to the fornices is uncommon and may be due to surgical removal of ventricular cysts and tumours.1 We report a case of bilateral fornix infarction with reduced fractional anisotropy values at 3 T after anterior communicating artery aneurysm clipping.. A healthy 33-year-old woman was admitted to our hospital with the incidental finding of an anterior communicating artery (ACoA) aneurysm on magnetic resonance angiography. Neurological examination was normal. Digital subtraction angiography visualised a broad based, tapered and 4 mm sized aneurysm of the ACoA and a median callosal artery (fig 1C). The ACoA aneurysm was treated with surgical clipping because of its irregular configuration. After surgery, the patient was drowsy with fluctuating impaired vigilance. She was disoriented in time, space and person, and revealed anterograde amnesia and amnesic aphasia. Her relatives noticed personality changes, psychomotor slowing and decreased spontaneity of speech and behaviour. Apart from ...
TY - GEN. T1 - VIDEO REQUIREMENTS FOR DIGITAL SUBTRACTION ANGIOGRAPHY.. AU - Hines, Horace H.. AU - Seibert, J Anthony. AU - Borger, David J.. PY - 1984. Y1 - 1984. N2 - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video camera for optimized DSA studies include sufficient bandpass to satisfy digitization matrix sizes, an 800:1 camera SNR, progressive read out of the camera target, and bias light to minimize build-up lag response.. AB - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video ...
Get Digital Subtraction Angiography cost from certified hospitals in Bangalore. Get assistance from medical experts to select best hospital for Digital Subtraction Angiography in Bangalore
I had a stroke back in early 2005. With that, and with my moms death, my neurologist recommended that I have an MRA done of my head. I had that done at the clinic today. The neurologist also wants me to get my homocystine levels checked to make sure my medications are still working. In addition, I saw my cardiologist earlier this week and she wants me to have my choloestrol checked. So, Im going to get blood work done at LabCorp on Friday ...
View details of top cerebral digital subtraction angiography dsa hospitals in New Delhi. Get guidance from medical experts to select best cerebral digital subtraction angiography dsa hospital in New Delhi
Grey-scale and Doppler ultrasound (US) are alternative modalities to diagnose soft-tissue vascular anomalies [16]. However, US has only a limited ability to display the full extent of large lesions and to demonstrate an intra-osseous component [17,18]. Some MRI techniques have been used for classification of peripheral vascular lesions [18,19,20]. Time-of-flight MR angiography can show feeding arteries with high-flow; however, this modality has a limitation regarding smaller vessels [19]. A previous study by van Rijswijk et al. [20] has demonstrated that with the use of the dynamic contrast-enhancement gradient-echo technique, venous malformations were distinguished from non-venous malformations with high specificity. Another study has demonstrated that time-resolved MR projection angiography was useful for the separation of high- and low-flow vascular malformations [18]. Although direct puncture venography is useful for the diagnosis of VMs and also for confirming lymphatic fluid leaks to ...
Coronary artery disease (CAD) is the leading cause of death in the United States. CAD is implicated in 900,000 deaths per year 1.5 million heart attacks occur each year estimated yearly cost of care for patients with CAD is $60 billion dollars More than 1 million cardiac catheterizations are performed each year cardiac catherization is used to define coronary artery anatomy, and also to guide therapy for cardiac patients X-ray coronary angiography is associated with significant radiation exposure and a small risk (1.7%) of serious complications estimated per-patient cost of cardiac catherization is $3000-$5000 Cardiac catheterization has diagnostic limitations X-ray angiography provides little information regarding coronary artery blood flow, and does not address the functional significance of coronary lesions
Purpose: To evaluate the suitability of an improved version of an automatic segmentation method based on geodesic active regions (GAR) for segmenting cerebral vasculature with aneurysms from 3D X-ray reconstruc-tion angiography (3DRA) and time of °ight magnetic resonance angiography (TOF-MRA) images available in the clinical routine.Methods: Three aspects of the GAR method have been improved: execution time, robustness to variability in imaging protocols and robustness to variability in image spatial resolutions. The improved GAR was retrospectively evaluated on images from patients containing intracranial aneurysms in the area of the Circle of Willis and imaged with two modalities: 3DRA and TOF-MRA. Images were obtained from two clinical centers, each using di®erent imaging equipment. Evaluation included qualitative and quantitative analyses ofthe segmentation results on 20 images from 10 patients. The gold standard was built from 660 cross-sections (33 per image) of vessels and aneurysms, ...
MR Angiography (MRA) is an MRI scan that provides pictures of blood vessels inside the body. These tests are used to diagnose blockages, aneurysms, and narrowing of blood vessels. Unlike traditional angiograms, which require an arterial catheter to be placed, MR angiography is completely non-invasive. If you are receiving an IV Contrast MRA, you will be injected with a contrast solution to make images appear brighter on the screen.. MRI doesnt use harmful radiation to create images. Instead, strong magnetic fields and radiofrequency waves (the same kind used in radio transmissions) are used to create images of the body. No harmful side effects have ever been reported from MRI. ...
We tested the hypothesis that differences in proximal and distal contrast bolus arrival times may result in insufficient vascular signal in the distal part of the aortoiliofemoral territory with routinely used timing techniques. The difference in arrival time of the contrast medium bolus between the aorta and the common femoral arteries was measured in 14 patients undergoing magnetic resonance angiography of the aortoiliac arteries. A dual-station test bolus technique adjusting for this difference was evaluated. The variation coefficient of the signal intensity in six defined locations and signal intensities (SI) normalised to fat were calculated. Comparisons were made with findings in 13 patients examined with a fluoroscopically triggered timing technique (BolusTrak, Philips Medical Systems, Best, The Netherlands). The difference in bolus arrival time between proximal and distal vessels was 0-7 s. In 3 of 14 patients it was 5.6-7 s. There was a tendency towards a lower mean variation ...
With Philips Digital Subtraction Angiography (DSA) automatic examination pre-sets support a smooth and efficient workflow in angiography examinations.
Animal models offer a flexible experimental environment for studying atherosclerosis. The mouse is the most commonly used animal, however, the underlying hemodynamics in larger animals such as the rabbit are far closer to that of humans. The aortic arch is a vessel with complex helical flow and highly heterogeneous shear stress patterns which may influence where atherosclerotic lesions form. A better understanding of intraspecies flow variation and the impact of geometry on flow may improve our understanding of where disease forms. In this work, we use magnetic resonance angiography (MRA) and 4D phase contrast magnetic resonance imaging (PC-MRI) to image and measure blood velocity in the rabbit aortic arch. Measured flow rates from the PC-MRI were used as boundary conditions in computational fluid dynamics (CFD) models of the arches. Helical flow, cross flow index (CFI), and time-averaged wall shear stress (TAWSS) were determined from the simulated flow field. Both traditional geometric metrics ...
Millimeter measurements are needed for management decisions and treatment planning of some vascular diseases. Surveying 2 recent issues of the American Journal of Neuroradiology gleaned reports requiring millimeter measurements from digital subtraction angiography (DSA).1-4 These included aneurysm sizes, necks, and devices matched to artery size.. Despite the multiple advantages of DSA, the technology did not, and still does not, include a method of measurement that provides the same ability to measure in millimeters as earlier analog techniques did. C-arm DSA with adjustable intensifiers reduces tube distance and thus increases magnification. Intensifier positional variability and tabletop movements add to millimeter inaccuracy with variable magnification in different projections.5 FOV settings further complicate calibrations. There are challenges to calibrating real millimeters with different positions when scanning the same patient. Manufacturers did not develop millimeter adjustments for ...
Ratering, D; Baltes, C; Lohmann, C; Matter, C M; Rudin, M (2011). Accurate assessment of carotid artery stenosis in atherosclerotic mice using accelerated high-resolution 3D magnetic resonance angiography. Magma, 24(1):9-18.. Baltes, C; Bosshard, S; Mueggler, T; Ratering, D; Rudin, M (2011). Increased blood oxygen level-dependent (BOLD) sensitivity in the mouse somatosensory cortex during electrical forepaw stimulation using a cryogenic radiofrequency probe. NMR in Biomedicine, 24(4):439-446.. Ratering, D. Improving sensitivity per unit time in small animal MRI: Low temperature detection and parallel acquisition. 2010, ETHZ Diss.No 18954, Faculty of Medicine.. Yankam Njiwa, J; Ratering, D; Baltes, C; Rudin, M (2010). Increasing temporal resolution of DSC perfusion MRI using the analytic image concept. Magma, 23(4):251-261.. Ratering, D; Baltes, C; Nordmeyer-Massner, J A; Marek, D; Rudin, M (2008). Performance of a 200-MHz cryogenic RF probe designed for MRI and MRS of the murine brain. Magnetic ...
The digital subtraction angiography method useful for three dimensional (3D) imaging of a selected volume of a body comprises the following steps. Acquiring first and second 3D data sets representative of an image of substantially the same selected volume in the body, the first and second data sets being acquired at different times corresponding to a pre- and a post injection of a contrast medium, respectively. Determining common reference points for spatially corresponding subvolumes in the data sets. Comparing in a 3D spatial manner data in subvolumes of the second data set with data in corresponding subvolumes in the first data set in order to determine a new reference point in each of the subvolumes of the first data set which results in a best match of the spatial similarity of the data in the corresponding subvolumes of the second data set. Spatially interpolating new data for the subvolumes of said first data set using the new reference points determined above and the originally acquired
MRIs are used to scan and examine one part of your body at a time. The scan can focus on many parts of the anatomy. There is even a form of MRI that can look at blood vessels and the flow of the blood as it goes through them. This is called Magnetic Resonance Angiography (MRA). These kinds of scans can help to find arterial and vein problems, such as a blocked vessel, torn vessel lining or aneurysm. The different kinds of MRI scans include, but are not limited to: Abdomen, Adrenal Glands, Ankle (Achilles), Bladder, Brain, Breast, Cervical Spine (C-Spine), Chest, Coccyx (Tailbone), Elbow, Face (Maxillofacial, Parotid Glands), Femur (Thigh, Upper Leg), Fingers, Foot, Forearm (Lower Arm), Hand, Hip, Humerus (Upper Arm), IACs (Inner Ear), Kidneys (Renal, Knee, Liver, Lower Leg (Calf, Tibia, Fibula), Lumbar Spine (L-Spine), Mandible (Jaw), MRA Abdomen (Abdominal Aorta), MRA Brain, MRA Chest, MRA Kidneys, MRA Knee, MRA Neck, Nasopharynx (Tongue), Neck, Orbits (Ears), Pancreas, Pelvis, Pituitary ...
Magnetic resonance perfusion imaging in glioblastoma Indications Magnetic resonance perfusion imaging, may: Provide a noninvasive diagnostic tool for properly grading lesions. Identifying the most malignant region of a tumor for guiding biopsy Monitoring response to therapy that may precede conventionally assessed changes in tumor morphology and enhancement characteristics.
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A 39-year-old man with no known cardiovascular risk factors was hospitalized for chest pain radiating to the side. Type A aortic dissection was diagnosed by transthoracic echocardiography and computed tomography (CT). Urgent surgery was performed, in which the ascending aorta was replaced with a valved tube graft (Bentall-Bono procedure). The patient had a phenotype typical of Marfan disease: height of 190 cm, long limbs, scoliosis and dural ectasia.. Postoperative follow-up included yearly imaging studies with transthoracic echocardiography and magnetic resonance angiography of the aorta. Two years later, after the aorta had reached a diameter of 59 mm in the curve distal to the origin of the supra-aortic trunks (Figure 1), a second operation, consisting of an elephant trunk technique (Figure 2) with on-pump circulation and retrograde cerebral perfusion was performed to repair the arch. The patient was thus prepared for the third and last operation, performed three months later and involving ...
SINAPSE is developing a world class future in medical imaging for Scotland by drawing on the combined expertise of seven Scottish universities.
SINAPSE is developing a world class future in medical imaging for Scotland by drawing on the combined expertise of seven Scottish universities.
Abnormalities in the vascular pattern of the retina are associated with retinal diseases and are also risk factors for systemic diseases, especially cardiovascular diseases. The three-dimensional retinal vascular pattern is mostly formed congenitally, but is then modified over life, in response to aging, vessel wall dystrophies and long term changes in blood flow and pressure. A characteristic of the vascular pattern that is appreciated by clinicians is vascular tortuosity, i.e. how curved or kinked a blood vessel, either vein or artery, appears along its course. We developed a new quantitative metric for vascular tortuosity, based on the vessels angle of curvature, length of the curved vessel over its chord length (arc to chord ratio), number of curvature sign changes, and combined these into a unidimensional metric, Tortuosity Index (TI). In comparison to other published methods this method can estimate appropriate TI for vessels with constant curvature sign and vessels with equal arc to ...
The first part of the book describes the normal anatomy of the cerebral arteries and veins, with attention to morphological aspect, embryological development, function, and vascular territories. Cerebral Angiography: Normal Anatomy and Vascular Pathology di Bradac, Gianni Boris su AbeBooks.it - ISBN 10: 3642156770 - ISBN 13: 9783642156779 - Springer Verlag - 2011 - Rilegato This anatomy module of e-Anatomy was designed and created by MD Micheau Antoine and MD Hoa Denis, radiologists in Montpellier (France). arteriovenous malformation; arteriovenous fistula MR angiography, and especially Gd-enhanced 3D MRA, has recently emerged and offers excellent visualization of venous morphology from multiple orientations. An overview of the current non-invasive MRA methods and their applications has been provided during depiction of normal venous anatomy. CT angiography of the cerebral arteries (also known as a CTA carotids or an arch to vertex angiogram) is a noninvasive technique allows visualization of ...
In addition to expanding our knowledge of the process of HCMV maturation, information from these studies will also be utilized to develop new antiviral therapies. We established founder colonies from West Africa, controlled for diversity, linkage disequilibrium and population stratification. Differential effects of tranylcypromine and imidazole on mammary carcinogenesis in rats fed low and high fat diets. This study reports on a combination of multi-echo acquisition with time-resolved undersampled PR imaging and its application to peripheral magnetic resonance angiography.. Moving a clinic system into a vertically integrated delivery system resulted in limited increases in quality of care indicators. Comparison of cervical os versus vaginal evidentiary findings during sexual assault exam. Resveratrol production in bioreactor: Assessment of cell physiological states and plasmid segregational stability. Germination of Aspergillus fumigatus inside avian respiratory macrophages is associated with ...
BACKGROUND: No golden diagnostic standard is available to diagnose chronic gastrointestinal ischemia (CGI). GOALS: We aimed to establish an accurate prediction model for CGI, based on clinical symptoms and radiologic evaluation of the amount of stenosis in the celiac artery (CA) and superior mesenteric artery (SMA) by means of computed tomography-angiography or magnetic resonance (MR)-angiography. STUDY: We prospectively included 436 consecutive patients with clinical suspicion of CGI in a tertiary referral center. Predictors for CGI were obtained by comparing clinical parameters to the diagnosis of CGI. Multivariable logistic regression was used to combine the strongest predictors in a model. A score chart based on the prediction model was provided to calculate the risk of CGI. RESULTS: CGI was present in 171/436 (39%) patients (67 y; range, 54 to 74 y; 27% male). Strongest predictors for CGI were female gender [odds ratio (OR)=1.44; 95% confidence interval (CI), 0.85-2.43], weight loss ...
Conventional angiography is the diagnostic standard for determining the presence, location and severity of heart disease. An EB, CT, EBT Angiography are different forms of angiographies that offers similar results if a convetional angiography is not necessary. Find an angiography clinic facility in your area.
Peripheral Vascular MR Angiography powerpoint presentation slides is available for free download uploaded in belonging ppt presentation Health & Wellness category, Download and Use!
For magnetic resonance angiography (MRA), ToF is a major underlying method. In this method, blood entering the imaged area is ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 2017-10-15. Cotter, Robert J. (1994). Time-of-flight ... The magnetic field can be measured by a fluxgate compass. High frequencies are passively shielded and damped by radar absorbent ... The sample should be immersed into the tube with holes and apertures for and against stray light to do magnetic experiments and ...
Magnetic resonance angiography (MRA) is a group of techniques based to image blood vessels. Magnetic resonance angiography is ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 2017-10-15. Keshavamurthy J, Ballinger R et al. "Phase ... "How we perform myocardial perfusion with cardiovascular magnetic resonance". Journal of Cardiovascular Magnetic Resonance. 9 (3 ... PC-MRI may be considered a method of magnetic resonance velocimetry. Since modern PC-MRI typically is time-resolved, it also ...
Play media Similar to DDS, Magnetic Resonance Angiography(MRA) also images blood vessels. MRA uses magnetic resonance and ... "Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... "Magnetic Resonance Angiography (MRA)". www.hopkinsmedicine.org. Retrieved 2020-12-10. Hartung, Michael P; Grist, Thomas M; ...
Angiography using X-rays or magnetic resonance angiography are methods to visualize blood vessels. The term "anatomy" is ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Medicine. "Angiography". National Health Service. Retrieved 29 April 2014 ... Magnetic resonance imaging, computed tomography, and ultrasound imaging have all enabled examination of internal structures in ... and magnetic resonance imaging. Derived from the Greek ἀνατομή anatomē "dissection" (from ἀνατέμνω anatémnō "I cut up, cut open ...
An alternative is magnetic resonance angiography or MRA. It is non-invasive, fast and avoids radiation (unlike a CT scan) but ... CT angiography is currently the top choice in diagnosing RVT. It is non-invasive, relatively cheap and fast with high accuracy ...
Magnetic resonance angiography (MRA) is a noninvasive diagnostic procedure that uses a combination of a large magnet, radio ... PMID 15858107.CS1 maint: multiple names: authors list (link) Leiner, T (February 2005). "Magnetic resonance angiography of ... Duplex ultrasonography and angiography may also be used. Angiography is more accurate and allows for treatment at the same time ... Contrast angiography is the most readily available and widely used imaging technique. Modern computerized tomography (CT) ...
Branches of external carotid artery Magnetic Resonance Angiography "Carotid artery". WebMD. Retrieved 28 July 2015. Human ...
... magnetic resonance angiography, perfusion and diffusion". Journal of Cardiovascular Magnetic Resonance. 13 (1): 70. doi:10.1186 ...
"Magnetic Resonance Angiography (MRA)". Johns Hopkins Medicine.. *^ "Angiography". National Health Service. Retrieved 29 April ... Angiography using X-rays or magnetic resonance angiography are methods to visualize blood vessels.[8][9][10][11] ... Magnetic resonance imaging, computed tomography, and ultrasound imaging have all enabled examination of internal structures in ... Gribble N, Reynolds K (1993). "Use of Angiography to Outline the Cardiovascular Anatomy of the Sand Crab Portunus pelagicus ...
Imaging modalities may include direct angiography, magnetic resonance angiography, and ultrasonography. Angiography is commonly ... Like angiography, CTA exposes patients to high dosages of radiation. Magnetic resonance angiography is used to diagnose ... Computed tomography angiography can determine the size of the aorta and its surrounding branches, and can identify vessel wall ... However, angiography is a relatively invasive investigation, exposing patients to large doses of radiation, so is not ...
... can be accurately diagnosed with magnetic resonance angiography. In teenagers and adults ... "The Role of Cardiovascular Magnetic Resonance in Pediatric Congenital Heart Disease". Journal of Cardiovascular Magnetic ... ISBN 978-0-9761552-7-0.[page needed] Aortic Coarctation Imaging at eMedicine Nielsen, J. C. (2005). "Magnetic Resonance Imaging ... as well as mean heart rate-corrected flow deceleration in the descending aorta as measured by phase contrast magnetic resonance ...
MA = Magnetic resonance angiography. *MG = Mammography. *MR = Magnetic Resonance. *MS = Magnetic Resonance Spectroscopy ...
... s (BPAs) are a class of magnetic resonance angiography contrast agents. Blood pool agents (also known as ... phase 3 study to determine the efficacy of gadofosveset-enhanced magnetic resonance angiography for evaluation of renal artery ... Magnetic Resonance - Technology Information Portal Wolf F, Plank C, Beitzke D, et al., Prospective evaluation of high- ... Blood Pool Agents Geraldes CF, Laurent S, Classification and basic properties of contrast agents for magnetic resonance imaging ...
Magnetic resonance angiography (MRA) This is similar to magnetic resonance imaging. Magnetic resonance angiography uses ... and nuclear magnetic resonance spectrometry". Journal of AOAC International. 91 (3): 580-88. doi:10.1093/jaoac/91.3.580. PMID ... In Digital Subtraction Angiography (DSA), the images are acquired digitally.[citation needed] ... magnetic fields and radio waves to provide detailed images of the blood vessels. The doctor may inject into the patient's ...
Once suspected, intracranial aneurysms can be diagnosed radiologically using magnetic resonance or CT angiography. But these ... "Comparison of computed tomography angiography with digital subtraction angiography in the assessment of clipped intracranial ... CT Angiography and MR Angiography for Detection - Prospective Blinded Comparison in a Large Patient Cohort". Radiology. 219 (3 ...
... magnetic resonance angiography and CT scan. A cerebral digital subtraction angiography (DSA) enhances visualization of the ... High resolution digital subtraction angiography may help in classifying CCF into dural and direct type and thus formulate a ...
These may include angiography, magnetic resonance imaging (MRI), and/or computed tomography (CT scan). The coronary arteries ...
A Clinical Study of Gadoteric Acid in Non-Coronary Magnetic Resonance (MR) Angiography Knör, S; Modlinger, A; Poethko, T; ...
In 1989, capability for magnetic resonance imaging (MRI) and digital subtraction angiography (DSA) was introduced. Northern ... CS1 maint: discouraged parameter (link) Melvin, Tessa (September 18, 1988). "Magnetic Imaging Approved for County". The New ...
... magnetic resonance angiography (MRA), and computed tomography angiography (CTA). Invasive testing through angiography is the ... In addition, computed tomography angiography and magnetic resonance angiography are commonly used to evaluate arteries in the ... Catheter-based angiography (with contrast) has proven to be the most accurate imaging technique: this test involves a catheter ... Experienced FMD clinicians warn against relying in the "string of beads" angiography for a diagnosis. In fact, it is suggested ...
Other diagnostical tools are duplex ultrasonography, computed tomography angiography (CTA), and magnetic resonance angiography ...
In magnetic resonance angiography (MRA), stenosis was seen in the distal segment of right vertebral artery. In addition, there ... Cranial MRI showed a right hemi medullary infarct, and magnetic resonance angiography showered severe stenosis of the right ... classical Babinski-Nageotte's syndrome with a patient with a clinically complete hemimedullary lesion.The magnetic resonance ...
Treatment depends on the anatomy of the malformation as determined by angiography or Magnetic Resonance Imaging (MRI). Head ...
... imaging equipment including angiography, computed tomography, fluoroscopy, magnetic resonance, mammography, molecular imaging ...
Both computed tomography angiography (CTA) and magnetic resonance angiography (MRA) have been proved to be effective in ... "Computed tomography angiography or magnetic resonance angiography for detection of intracranial vascular malformations in ...
Catheter angiography is ideal, but computed tomography angiography and magnetic resonance angiography can identify about 70% of ... Multiple angiographies may be necessary. Because other diseases (such as atherosclerosis) have similar angiographic ...
"Magnetic resonance angiography of intracranial and extracranial arteries in patients with spontaneous migraine without aura: a ... Magnetic Resonance Imaging (MRI) is best for brain tumors and problems in the posterior fossa, or back of the brain. MRI is ...
... angiography or magnetic resonance imaging (MRI). In certain circumstances, less invasive testing may not provide a certain ...
A study to explore new prospects for interventional peripheral magnetic resonance angiography (ipMRA)". Journal of Magnetic ... Nitinol wires are not magnetic and could potentially be imaged, but in practice the conductive nitinol heats up under the ... magnetic radiation which would damage surrounding tissues. An alternative that is being examined is to replace contemporary ... Resonance Imaging. 23 (2): 145-55. doi:10.1002/jmri.20486. PMID 16374877. Thanawala, Shilpa K.; Chaudhury, Manoj K. (2000). " ...
Radiographers now perform fluoroscopy, computed tomography, mammography, ultrasound, nuclear medicine and magnetic resonance ... Main article: Angiography. Angiography is the use of fluoroscopy to view the cardiovascular system. An iodine-based contrast is ... Angiography is used to find aneurysms, leaks, blockages (thromboses), new vessel growth, and placement of catheters and stents ... It is also used in CT pulmonary angiography to decrease the required dose of iodinated contrast.[23] ...
Brain metastasis in the right cerebral hemisphere from lung cancer, shown on magnetic resonance imaging. ... Early imaging methods - invasive and sometimes dangerous - such as pneumoencephalography and cerebral angiography have been ... Diagnosis is usually by medical examination along with computed tomography or magnetic resonance imaging.[2] The result is then ... especially magnetic resonance imaging (MRI) and computed tomography (CT) scans. Neoplasms will often show as differently ...
... angiography or magnetic resonance imaging (MRI). In certain circumstances, less invasive testing may not provide a certain ...
Magnetic resonance angiography and duplex ultrasonography appear to be slightly more cost-effective in diagnosing peripheral ... artery disease among people with intermittent claudication than projectional angiography.[3] Treatment[edit]. Exercise can ...
... with contrast-enhanced three-dimensional fast imaging with steady-state precession magnetic resonance angiography: comparison ... Magnetic resonance cholangiopancreatography (MRCP) is a non-invasive alternative to ERCP.[55][56][57] Some authors have ... magnetic resonance cholangiopancreatographic findings". American Journal of Gastroenterology. 95 (2): 432-40. doi:10.1111/j. ... "Performance characteristics of magnetic resonance cholangiography in the staging of malignant hilar strictures". Gut. 46 (1): ...
Fluorescein angiography. *Radionuclide angiography. *Magnetic resonance angiography. Venography. *Portography. *Impedance ...
MR angiography(英语:Magnetic resonance angiography). *MR cholangiopancreatography(英语:Magnetic resonance cholangiopancreatography) ... MRI of the brain(英语:Magnetic resonance imaging of the brain) ...
"An introduction to magnetic resonance imaging" (2014). மேலும் படிக்க[தொகு]. *A good comprehensive Medical Imaging Textbook ... "Radiation-reduction strategies in cardiac computed tomographic angiography". Clin Radiol 65 (11): 859-67. doi:10.1016/j.crad. ...
Magnetic resonance imaging (MRI) uses magnetic fields and radio waves to produce high quality two- or three-dimensional images ... In 1927 Egas Moniz introduced cerebral angiography, whereby both normal and abnormal blood vessels in and around the brain ... Functional magnetic resonance imagingEdit. Axial MRI slice at the level of the basal ganglia, showing fMRI BOLD signal changes ... Functional Magnetic Resonance Imaging (fMRI)Edit. fMRI is commonly classified as a minimally-to-moderate risk due to its non- ...
Computed tomography angiography, magnetic resonance angiography, invasive angiography. Treatment. Anticoagulation, angioplasty ... More modern methods involve computed tomography (CT angiography) and magnetic resonance imaging (MR angiography). They use ... Magnetic resonance angiogram of the neck vessels in a person with Ehlers-Danlos syndrome type IV; it shows a dissection of the ... The gold standard is cerebral angiography (with or without digital subtraction angiography).[3][14][15] This involves puncture ...
Fidler, JL; Fletcher, JG; Bruining, DH; Trenkner, SW (Jul 2013). "Current status of CT, magnetic resonance, and barium in ... Radionuclide angiography. *Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone ... Barium fluoroscopic examinations have some advantages over computed tomography and magnetic resonance techniques, such as ... magnetic resonance imaging, ultrasound imaging, endoscopy and capsule endoscopy,[7] barium contrast imaging remains in common ...
Once suspected, intracranial aneurysms can be diagnosed radiologically using magnetic resonance or CT angiography.[16] But ... Comparison of computed tomography angiography with digital subtraction angiography in the assessment of clipped intracranial ... CT Angiography and MR Angiography for Detection-Prospective Blinded Comparison in a Large Patient Cohort". Radiology. 219 (3): ...
Both computed tomography angiography (CTA) and magnetic resonance angiography (MRA) have been proved to be effective in ... "Computed tomography angiography or magnetic resonance angiography for detection of intracranial vascular malformations in ...
Schenck, John F. (1996). "The role of magnetic susceptibility in magnetic resonance imaging: MRI magnetic compatibility of the ... Murphy, Kieran J.; Brunberg, James A. (1997). "Adult claustrophobia, anxiety and sedation in MRI". Magnetic Resonance Imaging. ... Several other methods to study brain function exist, including functional magnetic resonance imaging (fMRI), positron emission ... Huang-Hellinger, F.; Breiter, H.; McCormack, G.; Cohen, M.; Kwong, K. (1995). "Simultaneous Functional Magnetic Resonance ...
Magnetic resonance imaging (MRI) of the head provides superior information as compared to CT scans when seeking information ... Main article: Computed tomography angiography. Computed tomography angiography (CTA) is contrast CT to visualize arterial and ... Journal of Magnetic Resonance Imaging. 25 (5): 900-909. doi:10.1002/jmri.20895. PMID 17457809.. ... AngiographyEdit. Example of a CTPA, demonstrating a saddle embolus (dark horizontal line) occluding the pulmonary arteries ( ...
Brain metastasis in the right cerebral hemisphere from lung cancer, shown on magnetic resonance imaging. ... Early imaging methods - invasive and sometimes dangerous - such as pneumoencephalography and cerebral angiography have been ... or magnetic resonance imaging (MRI).[2] The result is then often confirmed by a biopsy.[1] Based on the findings, the tumors ... especially magnetic resonance imaging (MRI) and computed tomography (CT) scans, though MRI is typically the reference standard ...
The mass of the left ventricle, as estimated by magnetic resonance imaging, averages 143 g ± 38.4 g, with a range of 87 -224 g. ... "Characterisation of the normal right ventricular pressure-volume relation by biplane angiography and simultaneous ... Journal of Cardiovascular Magnetic Resonance. 8: 417-426. doi:10.1080/10976640600572889.. (subscription required) ... gender and body surface area from steady-state free precession cardiovascular magnetic resonance" (PDF). European Heart Journal ...
... low-dose coronary CT angiography, nuclear imaging, and X-ray angiography), differences in the mechanism by which this damage ... "Oxygenation-sensitive contrast in magnetic resonance image of rodent brain at high magnetic fields", Magnetic Resonance in ... "Magnetic Resonance, a critical peer-reviewed introduction; functional MRI". European Magnetic Resonance Forum. Retrieved 17 ... "Journal of Magnetic Resonance Imaging. 35 (5): 1026-1037. doi:10.1002/jmri.23581. ISSN 1522-2586. PMC 3326188. PMID 22246782.. ...
Cerebral angiography. *Pneumoencephalography. *Echoencephalography/Transcranial Doppler. *Magnetic resonance imaging of the ... They include computer-assisted imaging computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography ... Techniques such as angioplasty, stenting, clot retrieval, embolization, and diagnostic angiography are endovascular procedures. ...
... echocardiography/cardiac magnetic resonance imaging for congenital heart disease, laboratory tests for schistosomiasis, and ... If unmatched perfusion defects are found, further evaluation by CT pulmonary angiography, right heart catheterization, and ...
Cerebral angiography. *Pneumoencephalography. *Echoencephalography/Transcranial Doppler. *Magnetic resonance imaging of the ...
... magnetic resonance imaging (MRI) and functional magnetic resonance imaging (fMRI), ultrasound and single-photon emission ... Radionuclide angiography. *Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone ... "Magnetic Resonance Materials in Physics, Biology and Medicine. 26 (1): 99-113. doi:10.1007/s10334-012-0353-4. ISSN 0968-5243.. ... PET scans are increasingly read alongside CT or magnetic resonance imaging (MRI) scans, with the combination (called "co- ...
Magnetic resonance imaging (MRI) may show the appropriate area. If AVMs are left untreated, 50% of patients with gradual ... If the myelogram is positive, angiography is required to show the extent of malformation and the exact site of the shunt. ...
Magnetic resonance imaging (MRI)[cuir in eagar , athraigh foinse]. Príomhalt: Magnetic resonance imaging ... Fluoroscopy and angiography are special applications of X-ray imaging, in which a fluorescent screen and image intensifier tube ... MRI uses strong magnetic fields to align atomic nuclei (usually hydrogen protons) within body tissues, then uses a radio signal ... The technology recently blossomed following passing a technical hurdle of altered positron movement in strong magnetic field ...
"Magnetic Resonance, a critical peer-reviewed introduction". European Magnetic Resonance Forum. Retrieved 16 November 2014.. ... Fluoroscopy and angiography are special applications of X-ray imaging, in which a fluorescent screen and image intensifier tube ... and magnetic resonance imaging (MRI) are used to diagnose or treat diseases. Interventional radiology is the performance of ... and magnetic resonance imaging (MRI). The modern practice of radiology involves several different healthcare professions ...
... are diagnosed by the combination of suggestive symptoms from the history and physical and neuroimaging by magnetic resonance ... Angiography looking for signs like stretched arteries may be used to supplement evaluation of vascular involvement and to ...
Echocardiography Electrocardiography Cardiac Imaging Magnetic Resonance Imaging Cardiac catheterization and angiography Chest X ...
"Journal of magnetic resonance imaging: JMRI. 35 (5): 1026-1037. doi:10.1002/jmri.23581. ISSN 1522-2586. PMC 3326188. PMID ... Application of this process is used to develop radionuclide angiography, a method of diagnosing heart problems. ... Two main categories of magnetic resonance imaging (MRI) techniques can be used to measure tissue perfusion in vivo. ... Huettel, S. A.; Song, A. W.; McCarthy, G. (2009), Functional Magnetic Resonance Imaging (2 ed.), Massachusetts: Sinauer, ISBN ...
Magnetic Resonance in Medicine.. *↑ Rinck PA (2008). "A short history of magnetic resonance imaging". Spectroscopy Europe. 20 ( ... Radionuclide angiography. *Radioisotope renography. *Sestamibi parathyroid scintigraphy. *Radioactive iodine uptake test. *Bone ... എം.ആർ.ഐ സ്കാൻ (Magnetic resonance imaging/മാഗ്നെറ്റിക് റെസൊണൻസ് ഇമേജിങ് (MRI)) അഥവാ കാന്തിക അനുരണന ചിത്രീകരണം എന്നത് ശരീരത്തിലെ ... "European Magnetic Resonance Forum (EMRF)/The Round Table Foundation (TRTF).. *A Guided Tour of MRI: An introduction for ...
Magnetic Resonance Angiography (MRA) is a test that provides images of your blood vessels. Find out when your doctor might ... Society for Vascular Surgery: "Computed Tomography Angiography (CTA) and Magnetic Resonance Angiography (MRA) Tests." ... MRA stands for Magnetic Resonance Angiogram or MR Angiography.. Your doctor may ask you to get one in order to look for and ... For the MRA, you will lie on an exam table that slides into a large circular area, the magnetic field. The actual equipment may ...
Unlike traditional angiography that involves placing a tube (catheter) into the body, MRA is noninvasive. ... Magnetic resonance angiography (MRA) is an MRI exam of the blood vessels. ... Magnetic resonance angiography (MRA) is an MRI exam of the blood vessels. Unlike traditional angiography that involves placing ... Cardiovascular magnetic resonance imaging. In: Zipes DP, Libby P, Bonow RO, Mann DL, Tomaselli GF, Braunwald E, eds. ...
... also called a magnetic resonance angiogram or MRA - is a type of MRI that looks specifically at the bodys blood vessels. ... Home Health Treatment Tests and Therapies Magnetic Resonance Angiography MRA Magnetic Resonance Angiography (MRA). Facebook ... What happens during magnetic resonance angiography?. Magnetic resonance angiography may be done on an outpatient basis or ... What is magnetic resonance angiography?. Youve probably heard about the test called magnetic resonance imaging or MRI. In this ...
With the invention of non-invasie magnetic resonance imaging (MRI) technique, imaging of flow has blossomed into a powerful ... inflammatory or vascular malformations.Conventional x-ray angiography and digital subtraction angiography (DSA) are used to ... to a conventional angiogram.It does not require the injection of an external contrast because MRA uses the natural magnetic ...
Magnetic Resonance Angiography (MRA). What is MRA?. Magnetic resonance angiography (MRA) is a safe, painless MRI study of the ... Health services and information : Health services : For Adults A-Z : Imaging : Magnetic Resonance Angiography (MRA) ... Magnetic Resonance Angiography (MRA). *Magnetic Resonance Imaging (1.5T and 3T MRI) ...
Magnetic resonance angiography (MRA) is a group of techniques based on magnetic resonance imaging (MRI) to image blood vessels ... "Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... Magnetic resonance angiography is used to generate images of arteries (and less commonly veins) in order to evaluate them for ... Contrast-enhanced magnetic resonance angiography uses injection of MRI contrast agents and is currently the most common method ...
Comparison of contrast-enhanced magnetic resonance angiography and conventional pulmonary angiography for the diagnosis of ... Meaney JF, Prince MR (1999b) Method and apparatus for magnetic resonance angiography using contrast agents. United States ... Diagnosis of pulmonary embolism with magnetic resonance angiography. N Engl J Med 336(20):1422-1427PubMedCrossRefGoogle Scholar ... Performance of magnetic resonance angiography in suspected acute pulmonary embolism. Thromb Haemost 93(3):503-511PubMedGoogle ...
magnetic resonance angiography (MRA). (an-jE-O-gra-fE). A method of angiography utilizing the magnetic properties of tissues ...
MRA is a study of the blood vessels using magnetic resonance imaging (MRI). Using a large magnet, radio waves, and a computer, ... www.heart.org/HEARTORG/Conditions/HeartAttack/DiagnosingaHeartAttack/Magnetic-Resonance-Imaging-MRI_UCM_441632_Article.jsp#. ... Magnetic resonance imaging (MRI). American Heart Association website. Available at: http:// ... MR angiography (MRA). Radiology Info-Radiological Society of North America website. Available at: https://www.radiologyinfo.org ...
Comprehensive Magnetic Resonance Angiography information for consumers and professionals including user ratings, reviews and ... Compare Magnetic Resonance Angiography related medications by generic name. ... What is Magnetic Resonance Angiography: Magnetic resonance angiography is an MRI exam of the blood vessels. Unlike traditional ... Learn more about Magnetic Resonance Angiography. Micromedex® Care Notes. *Magnetic Resonance Angiography ...
A protocol for two-dimensional magnetic resonance coronary angiography studied in three-dimensional magnetic resonance data ... A preliminary report comparing magnetic resonance coronary angiography with conventional angiography. N Engl J Med. 1993;328: ... Magnetic Resonance Angiography of Anomalous Coronary Arteries. Johannes C. Post, Albert C. van Rossum, Jean G.F. Bronzwaer, ... Magnetic Resonance Angiography of Anomalous Coronary Arteries. Johannes C. Post, Albert C. van Rossum, Jean G.F. Bronzwaer, ...
... evaluated with magnetic resonance imaging (MRI), especially 3-dimensional contrast-enhanced magnetic resonance angiography ... Magnetic resonance angiography in extracranial giant cell arteritis J Clin Rheumatol. 2011 Sep;17(6):306-10. doi: 10.1097/RHU. ... Among the 19 patients with magnetic resonance angiography lesions in the subclavian/axillary arteries, 12 (75%) had biopsy- ...
... and contrast-enhanced magnetic resonance angiography (CEMRA), to aid in PAD diagnosis and subsequent treatment planning. Due to ... A number of diagnostic imaging techniques exist, including computed tomography angiography (CTA) ... "Quiescent-Interval Single-Shot Magnetic Resonance Angiography." Diagnostics 8, no. 4: 84. ... Quiescent-Interval Single-Shot Magnetic Resonance Angiography. Diagnostics 2018, 8, 84. AMA Style. Saini A, Wallace A, Albadawi ...
Magnetic resonance angiography. Definition. Magnetic resonance angiography (MRA) is an MRI exam of the blood vessels. Unlike ... MRA; Angiography - magnetic resonance. How the Test is Performed. You may be asked to wear a hospital gown. You can also wear ... Cardiovascular magnetic resonance imaging. In: Bonow RO, Mann DL, Zipes DP, Libby P, Braunwald E, eds. Braunwalds Heart ... Magnetic resonance imaging. In: Cronenwett JL, Johnston KW, eds. Rutherfords Vascular Surgery. 8th ed. Philadelphia, PA: ...
Quantitative Magnetic Resonance Angiography. A Promising Tool in the Assessment of Intracranial In-Stent Stenosis?. Andrew ... The utility of quantitative magnetic resonance angiography in the assessment of intracranial in-stent stenosis. Stroke. 2009; ... They looked at 14 patients with intracranial stents and compared quantitative MR angiography and conventional angiography. ... Other noninvasive imaging such as MR angiography and CT are usually degraded by artifact by the stents; as they state in the ...
Parasaggital gadolinium enhanced magnetic resonance angiography (left) demonstrates a uniform 3 cm narrowing in the proximal ...
Comparison of magnetic resonance angiography and 18F-fluorodeoxyglucose positron emission tomography in large-vessel vasculitis ...
60/646,434, entitled "Tourniquet for Magnetic Resonance Angiography, and Method of Using Same", filed Jan. 24, 2005; and (2) U. ... This invention relates to a device to improve the images obtained using magnetic resonance angiography ("MRA"); and more ... 60/678,410, entitled "Tourniquet for Magnetic Resonance Angiography, and Method of Using Same", filed May 6, 2005 (hereinafter ... "High-resolution magnetic resonance angiography of hands with timed arterial compression (tac-MRA)" Lancet 2003, 36149-50; (6) ...
Procedure: Whole body magnetic resonance angiography (dotarem) Device: Whole body magnetic resonance angiography (vasovist) ... To investigate the diagnostic performance of whole body magnetic resonance angiography (WB-MRA) using two different magnetic ... Whole Body Magnetic Resonance Angiography in Ischemic Patients. The safety and scientific validity of this study is the ... Whole Body Magnetic Resonance Angiography in Patients With Symptomatic Peripheral Ischemia. Study Start Date :. September 2007 ...
... Neurol Res. 1996 Aug;18(4):354-60. doi: 10.1080/ ... realistic 3-D computational meshes of human intracranial arteries and aneurysms from serial magnetic resonance angiography ... However, these techniques may be applied to any other form of imaging data including computed tomographic angiography. First, ...
Magnetic Resonance Angiography (MRA) is a method used to evaluate arteries and veins without the use of invasive catheters or x ... Magnetic Resonance Angiography (MRA) for the Diagnosis of Atherosclerosis. This study has been completed. ... Contrast Enhanced Magnetic Resonance Angiography (MRA) is a developing technology that permits the non-invasive evaluation of ... Contrast Enhanced Resonance Angiography (MRA) in the Diagnosis of Atherosclerotic Disease: A Pilot Technical Development Study ...
... including magnetic resonance angiography (MRA), computed tomographic angiography, and digital subtraction angiography, have ... Hypertension Correlates With Lenticulostriate Arteries Visualized by 7T Magnetic Resonance Angiography. Chang-Ki Kang, Chan-A ... Imaging and analysis of lenticulostriate arteries using 7.0-tesla magnetic resonance angiography. Magn Reson Med. 2009; 61: 136 ... Hypertension Correlates With Lenticulostriate Arteries Visualized by 7T Magnetic Resonance Angiography. Chang-Ki Kang, Chan-A ...
... abdomen as maintained by CMS falls under Magnetic Resonance Angiography, Trunk and ... HCPCS Code C8900 for Magnetic resonance angiography with contrast, ... HCPCS Code C8900 Magnetic resonance angiography with contrast, abdomen. HCPCS code C8900 for Magnetic resonance angiography ... abdomen as maintained by CMS falls under Magnetic Resonance Angiography, Trunk and Lower Extremities.. ...
Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood ... Magnetic Resonance Angiography. What is magnetic resonance angiography? Youve probably heard about the test called magnetic ... What happens during magnetic resonance angiography? Magnetic resonance angiography may be done on an outpatient basis or during ... How do I get ready for magnetic resonance angiography? Magnetic resonance angiography is generally regarded as a safe test, but ...
... www.lahey.org/health-library/magnetic-resonance-angiography-415/. *https://www.lahey.org/health-library/magnetic-resonance- ... MRA is a study of the blood vessels using magnetic resonance imaging (MRI). Using a large magnet, radio waves, and a computer, ... www.heart.org/HEARTORG/Conditions/HeartAttack/DiagnosingaHeartAttack/Magnetic-Resonance-Imaging-MRI%5FUCM%5F441632%5FArticle. ... Magnetic resonance imaging (MRI). American Heart Association website. Available at: http:// ...
MRA is a study of the blood vessels using magnetic resonance imaging (MRI). Using a large magnet, radio waves, and a computer, ... Magnetic Resonance Angiography. Definition. MRA is a study of the blood vessels using magnetic resonance imaging (MRI). Using a ... www.heart.org/HEARTORG/Conditions/HeartAttack/DiagnosingaHeartAttack/Magnetic-Resonance-Imaging-MRI%5FUCM%5F441632%5FArticle. ... Magnetic resonance imaging (MRI). American Heart Association website. Available at: http:// ...
An Issue of Magnetic Resonance Imaging Clinics, Volume 17-1 - 1st Edition. Print Book. ISBN 9781437704976 ... Emerging Concepts in MR Angiography, An Issue of Magnetic Resonance Imaging Clinics, Volume 17-1 1st Edition. ... More and more physicians have been using Magnetic Resonance Angiography due to the fact that it is a noninvasive imaging ... Emerging Concepts in MR Angiography, An Issue of Magnetic Resonance Imaging Clinics ...
Magnetic Resonance Angiography Vascular Stents Digital Substraction Angiography Catheter Therapy Peripheral Magnetic Resonance ... Peripheral magnetic resonance angiography. In: Nagel E., van Rossum A.C., Fleck E. (eds) Cardiovascular Magnetic Resonance. ... Peripheral magnetic resonance angiography Breath-hold gadolinium-enhanced MR angiography of the abdominal aorta and its major ... Grist TM (1999) Magnetic resonance angiography of renal arterial stenosis. Coron Artery Dis 10:151-156PubMedCrossRefGoogle ...
... upper extremity as maintained by CMS falls under Magnetic Resonance Angiography, ... HCPCS Code C8935 for Magnetic resonance angiography without contrast, ... HCPCS Code for Magnetic resonance angiography without contrast, upper extremity C8935 HCPCS code C8935 for Magnetic resonance ... angiography without contrast, upper extremity as maintained by CMS falls under Magnetic Resonance Angiography, Spine and Upper ...
Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood ... Magnetic Resonance Angiography (MRA). What is magnetic resonance angiography (MRA)?. Youve probably heard about the test ... Magnetic resonance angiography (MRA) is a type of MRI. It looks just at the bodys blood vessels. A regular angiogram requires ... An MRI uses radio waves, a magnetic field, and a computer create a scan of your body to look for health problems. ...
  • We compared the number of stems and branches, curvature, and tortuosity of the lenticulostriate arteries by 3D time-of-flight magnetic resonance angiography among 20 hypertensive patients (mean age: 46.6±9.1 years) and 20 age-matched healthy subjects (mean age: 47.7±8.1 years). (ahajournals.org)
  • The Chinese Cerebral Aneurysms Survey is a continuing prospective study to evaluate the effectiveness of unenhanced, three-dimensional time-of-flight magnetic resonance angiography (3D-TOF-MRA) with volume rendering (VR) at 3-T in the detection of intracranial aneurysms. (clinicaltrials.gov)
  • The vasculature in the rat brains was investigated by time-of-flight magnetic resonance angiography using a 9.4 Tesla small animal MR imaging system. (mdc-berlin.de)
  • Time-of-flight magnetic resonance angiography (TOF-MRA) and contrast-enhanced MRA (CE-MRA) are other potentially useful techniques. (avmi.net)
  • Time-of-flight magnetic resonance angiography (MRA) is a non-invasive and fast method. (surgicalneurologyint.com)
  • Time-of-flight magnetic resonance angiography (TOF-MRA) did not describe them due to clip-induced artifact (arrow, b), but pointwise encoding time reduction with radial acquisition (PETRA)-MRA revealed the arteries (arrow, c). (surgicalneurologyint.com)
  • Imaging of blood vessels thus important in depiction of stenotic, occlusive, aneurismal, inflammatory or vascular malformations.Conventional x-ray angiography and digital subtraction angiography (DSA) are used to depict vascular lesions with high accuracy via intravascular administration of contrast (dye) material. (medindia.net)
  • as they state in the article, digital subtraction angiography is invasive and carries up to a 1% risk of stroke. (ahajournals.org)
  • Most proposed registries and trials also specify follow-up with conventional digital subtraction angiography. (ahajournals.org)
  • Diagnosis of atherosclerosis in the legs is normally done with an interventional x-ray-based angiography (DSA- digital subtraction angiography). (clinicaltrials.gov)
  • Although current neuroimaging techniques, including magnetic resonance angiography (MRA), computed tomographic angiography, and digital subtraction angiography, have been used to investigate vascular pathophysiology, the study of microvascular diseases in vivo has been restricted by their inherent invasiveness and/or limited resolution. (ahajournals.org)
  • Meaney JF, Ridgway JP, Chakraverty S, Robertson I, Kessel D, Radjenovic A, Kouwenhoven M, Kassner A, Smith MA (1999) Stepping-table gadolinium-enhanced digital subtraction MR angiography of the aorta and lower extremity arteries: preliminary experience. (springer.com)
  • To evaluate the accuracy of gadolinium-enhanced magnetic resonance angiography in assessing renal artery stenosis compared to catheter digital subtraction angiography. (hkmj.org)
  • Records of patients who underwent magnetic resonance angiography as well as digital subtraction angiography for assessment of renal artery stenosis from January 2003 to December 2005 were reviewed. (hkmj.org)
  • Each of the two experienced interventional and body magnetic resonance radiologists, who were blinded to the results, reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. (hkmj.org)
  • Digital subtraction angiography was used as the standard of reference. (hkmj.org)
  • Contrast enhanced MRA using an intravenously administered gadolinium agent can overcome the limitations of TOF MR A. One contrast enhanced MRA method, projection magnetic resonance digital subtraction angiograph (MRDSA), generates time-resolved angiograms in a manner similar to conventional digital x-ray digital subtraction angiography. (iospress.com)
  • In order to evaluate the sensitivity and specificity of magnetic resonance angiography (MRA) in spontaneous subarachnoid haemorrhage, 14 patients with recent haemorrhage verified by CT or lumbar puncture were investigated with both selective intra-arterial digital subtraction angiography (IA-DSA) and MRA by two independent teams, each having the same preangiographic information. (semanticscholar.org)
  • Radiologic modalities used for assessment include lung scintigraphy, digital subtraction pulmonary angiography (DSPA), pulmonary computed tomography angiography (PCTA), and pulmonary magnetic resonance angiography (PMRA). (medscape.com)
  • It has been clinically validated with contrast enhanced magnetic resonance angiography (CE-MRA) and digital subtraction angiography (DSA) (2,3). (biomedcentral.com)
  • However, its overall accuracy is less than digital subtraction angiography and is prone to give false-positive or false-negative results. (operativeneurosurgery.com)
  • 54 patients, 30 with acute SAH were diagnosed using the three dimensional time-of-flight MRA in comparison with a conventional four vessel digital subtraction angiography prior to surgery. (operativeneurosurgery.com)
  • Comparison with Selective Digital Subtraction Angiography. (scirp.org)
  • Magnetic resonance angiography (MRA) is an MRI exam of the blood vessels. (medlineplus.gov)
  • Magnetic resonance angiography-also called a magnetic resonance angiogram or MRA-is a type of MRI that looks specifically at the body's blood vessels. (hopkinsmedicine.org)
  • If your healthcare provider believes that you may have a narrowing or blockage of blood vessels somewhere in your body, he or she may recommend magnetic resonance angiography. (hopkinsmedicine.org)
  • Blood vessels are rendered, not in the usual tomographic format of standard MR images, but as a projection over a large volume, similar to a conventional angiogram.It does not require the injection of an external contrast because MRA uses the natural magnetic properties of the hydrogen atoms present in our bodies to create (with the help of a computer) images of the blood vesels. (medindia.net)
  • Magnetic resonance angiography (MRA) is a safe, painless MRI study of the blood vessels. (legacyhealth.org)
  • Magnetic resonance angiography (MRA) is a group of techniques based on magnetic resonance imaging (MRI) to image blood vessels. (wikipedia.org)
  • Magnetic resonance angiography is an MRI exam of the blood vessels. (drugs.com)
  • Angiography of the thoracic, abdominal, renal, and peripheral blood vessels is reviewed in this issue. (foyles.co.uk)
  • MRA-a type of magnetic resonance imaging (MRI) study that is obtained with the same scanning machine-uses a strong magnetic field combined with radiofrequency waves to create highly detailed images of blood vessels in the body. (healthcommunities.com)
  • To provide better definition of blood vessels on the images, a weakly magnetic contrast dye, such as gadolinium, is sometimes injected into a vein in the arm. (healthcommunities.com)
  • MRA (magnetic resonance angiography) is used to evaluate blood vessels in the body. (osu.edu)
  • They also may insert dye into the blood vessels of the lungs, by using a tube inserted in a leg vein and threaded through the heart, to see blockages in the arteries in the lungs (pulmonary angiography). (annals.org)
  • Using magnetic resonance angiography to measure abnormal synovial blood vessels in early inflammatory arthritis: A new imaging biomarker? (jrheum.org)
  • Magnetic resonance angiography (MRA) is a non-invasive diagnostic procedure that uses a combination of magnetic resonance technology (MRI) and intravenous (IV) contrast dye to visualize blood vessels. (stanfordhealthcare.org)
  • Magnetic resonance angiography (MRA) uses MRI to look at blood vessels in your brain, neck, heart, lungs, kidneys and legs. (wa.gov.au)
  • Self-tracking of contrast kinetics for automatic triggering of contrast-enhanced whole-heart coronary magnetic resonance angiography. (nih.gov)
  • To develop a method for automatically triggering centric data acquisition during contrast-enhanced whole-heart coronary magnetic resonance angiography (MRA). (nih.gov)
  • Whole-heart coronary magnetic resonance angiography (WH-MRA) is useful noninvasive examination. (spie.org)
  • Unlike traditional angiography that involves placing a tube (catheter) into the body, MRA is noninvasive. (medlineplus.gov)
  • MR coronary angiography is a novel noninvasive technique that has proved to be accurate in the imaging of proximal coronary anatomy in patients. (ahajournals.org)
  • More and more physicians have been using Magnetic Resonance Angiography due to the fact that it is a noninvasive imaging technique that does not involve exposure to radiation. (elsevier.com)
  • Magnetic resonance angiography (MRA) offers a noninvasive, complementary approach that provides information about larger vessels. (aacrjournals.org)
  • Specifically, noninvasive approaches, such as dynamic susceptibility contrast magnetic resonance imaging (MRI), have been utilized to depict regional vascular density, potentially useful in differentiating lesion pathology ( 12 - 19 ). (aacrjournals.org)
  • What are the diagnostic accuracies of 5 noninvasive or minimally invasive tests for detecting renal artery stenosis: computed tomographic angiography (CTA), magnetic resonance angiography (MRA), ultrasonography, captopril scintigraphy, and the captopril test? (acpjc.org)
  • Whole-heart coronary MR angiography allows for noninvasive detection of significant narrowing in coronary arterial segments with a diameter of ≥2 mm with moderate sensitivity and high specificity. (onlinejacc.org)
  • Coronary magnetic resonance angiography (MRA) is a powerful noninvasive technique with high soft-tissue contrast for the visualization of the coronary anatomy without X-ray exposure. (elsevier.com)
  • It has been established that internal hemorrhage can be detected and localized with noninvasive and minimally invasive imaging methods such as CT angiography, conventional angiography and nuclear scintigraphy. (scirp.org)
  • A number of diagnostic imaging techniques exist, including computed tomography angiography (CTA) and contrast-enhanced magnetic resonance angiography (CEMRA), to aid in PAD diagnosis and subsequent treatment planning. (mdpi.com)
  • Several investigations, including magnetic resonance imaging (MRI), computed tomography (CT), and orbital ultrasound are used to non-invasively screen for carotid cavernous fistula (CCF), with variable results. (bmj.com)
  • Mitterberger M, Pinggera GM, Neururer R et al (2008) Comparison of contrast-enhanced color Doppler imaging (CDI), computed tomography (CT) and magnetic resonance imaging (MRI) for the detection of crossing vessels in patients with ureteropelvic junction obstruction. (springer.com)
  • The sensitivity and specificity of high-resolution computed tomography and magnetic resonance imaging for the diagnosis of small intracranial aneurysms have been disappointing. (asnjournals.org)
  • Computed tomography angiography, sonography, scintigraphy, and portography can be used to evaluate the portal vasculature to evaluate for a portosystemic shunt (PSS). (avmi.net)
  • Contrast-enhanced computed tomography angiography is usually valuable for the evaluation of clipped cerebral aneurysm, but it has side effects of contrast medium. (surgicalneurologyint.com)
  • Computed tomography angiography described M1 and M2 portion of the middle cerebral artery and the vicinity of a clip in detail (arrow, a). (surgicalneurologyint.com)
  • Diagnosis of this course by conventional x-ray coronary angiography alone may be equivocal. (ahajournals.org)
  • Conclusions These data suggest that fast MR angiography is highly accurate in determining the origin and delineating the proximal course of anomalous coronary arteries, even in those cases in which x-ray coronary angiographic diagnosis is difficult or even erroneous. (ahajournals.org)
  • Using conventional angiography as the diagnostic standard, gadolinium-enhanced magnetic resonance angiography is highly sensitive and specific for the diagnosis of peripheral vascular disease. (acpjc.org)
  • Diagnosis of intracranial aneurysms: accuracy of MR angiography at 0.5 T. (semanticscholar.org)
  • In 37 patients, successful MR coronary angiography could be performed. (ahajournals.org)
  • In 3 patients (all with an anomalous left main coronary artery originating from the right aortic sinus), there was disagreement about the proximal course between the results of MR and x-ray coronary angiography. (ahajournals.org)
  • The objective of the study was to retrospectively review extracranial involvement in patients with GCA and/or polymyalgia rheumatica (PMR), evaluated with magnetic resonance imaging (MRI), especially 3-dimensional contrast-enhanced magnetic resonance angiography images of the aortic arch and its branches. (nih.gov)
  • Among the 19 patients with magnetic resonance angiography lesions in the subclavian/axillary arteries, 12 (75%) had biopsy-proven GCA, but only 5 (41%) of these patients had clinical features of large artery disease. (nih.gov)
  • They looked at 14 patients with intracranial stents and compared quantitative MR angiography and conventional angiography. (ahajournals.org)
  • 2 Because this is a new technique, and restenosis is a problem as yet unquantified in sufficient numbers of patients, all patients routinely undergo follow-up angiography with, I am sure, an undoubted morbidity. (ahajournals.org)
  • The goal of this study is to improve MRA to the point that it can reliably replace diagnostic x-ray catheter angiography in the evaluation of patients with atherosclerosis. (clinicaltrials.gov)
  • Patients must have suspected atherosclerotic disease based on clinical findings or documented by angiography or doppler ultrasound performed within 3 months of the MRA. (clinicaltrials.gov)
  • In conclusion, our results showed that there was a substantial difference in the lenticulostriate arteries of hypertensive patients compared with healthy individuals when observed in vivo by ultrahigh-resolution 7T magnetic resonance angiography, and the difference was considerable in young subjects. (ahajournals.org)
  • In a randomized parallel feasibility study in 22 adult patients with PHT and a clinical indication for NSBB, we acquired haemodynamic data at baseline and after 4 weeks of NSBB (propranolol or carvedilol) using phase-contrast MR angiography (PC-MRA) in selected intra-abdominal vessels. (hindawi.com)
  • Recently, magnetic resonance imaging (MRI) based techniques have shown promise for investigating differential visceral blood flow in the hyperdynamic circulation of patients with cirrhosis [ 9 ] and in quantifying PHT. (hindawi.com)
  • Magnetic resonance angiography (MRA) with magnetic resonance venography (MRV) had high sensitivity and specificity for diagnosing pulmonary embolism in adults, but results were technically inadequate for 52% of patients. (annals.org)
  • 2 reviewers selected English-, German-, or French-language studies if they used intra-arterial x-ray angiography as the diagnostic standard, patients were referred for clinical suspicion of renovascular hypertension, criteria and cutoff points for positive results were explicitly defined for each test, and the number of positive and negative results were reported for both the test and the diagnostic standard. (acpjc.org)
  • How does gadolinium-enhanced magnetic resonance (MR) angiography compare with color-guided duplex ultrasonography (DUS) and conventional angiography in the workup for patients with peripheral arterial disease? (acpjc.org)
  • The MR-INFORM study investigated the clinical effectiveness of non-invasive magnetic resonance perfusion measurements in comparison to invasive coronary angiography supported by pressure measurements in the coronary arteries (fractional flow reserve, FFR), in patients with stable angina. (scmr.org)
  • The MR-INFORM investigators randomized 918 patients with effort induced chest pain into either invasive testing with angiography and FFR measurements or into magnetic resonance perfusion imaging. (scmr.org)
  • In both groups patients did well with a very low event rate (3.9% in the angiography guided group and 3.33% in the MR perfusion guided group). (scmr.org)
  • Both tests performed identically, demonstrating that patients can be safely guided by magnetic resonance perfusion imaging as the first line technique. (scmr.org)
  • Until now, most of these patients were sent to invasive angiography. (scmr.org)
  • To determine the value of magnetic resonance angiography (MRA), 85 patients with ADPKD without symptoms related to an intracranial aneurysm and 2 patients with ADPKD presenting with a subarachnoid hemorrhage or a suspected aneurysmal leak were studied. (asnjournals.org)
  • Magnetic resonance coronary angiography (MRCA) has been shown to be useful in the assessment of the 3-dimensional relationship between the coronary arteries and the great vessels in subjects with normal cardiac morphology but has not been used in patients with congenital heart disease. (ucl.ac.uk)
  • CONCLUSIONS: For the assessment of anomalous coronary artery anatomy in patients with congenital heart disease, the use of the combination of MRCA with x-ray coronary angiography improves the definition of the proximal coronary artery course. (ucl.ac.uk)
  • The accuracy of whole-heart coronary magnetic resonance (MR) angiography was evaluated in 131 patients. (onlinejacc.org)
  • The acquisition of MR angiography was completed in 113 (86 %) of 131 patients, with an average imaging time of 12.9 ± 4.3 min. (onlinejacc.org)
  • Background The accuracy of whole-heart coronary MR angiography has not been determined in a large number of patients. (onlinejacc.org)
  • A previous multicenter study demonstrated that 3-dimensional respiratory-gated coronary magnetic resonance (MR) angiography reliably identifies patients with left main coronary artery or 3-vessel disease ( 1 ). (onlinejacc.org)
  • However, the accuracy of whole-heart coronary MR angiography for detecting coronary stenoses has not been determined in a large number of patients. (onlinejacc.org)
  • Contrast Enhanced Magnetic Resonance Angiography (MRA) is a developing technology that permits the non-invasive evaluation of arterial and venous structures without the need for x-ray based catheter angiography. (clinicaltrials.gov)
  • Hany TF, Debatin JF, Leung DA, Pfammatter T (1997) Evaluation of the aortoiliac and renal arteries: comparison of breath-hold, contrast-enhanced, three-dimensional MR angiography with conventional catheter angiography. (springer.com)
  • A very small amount of gadolinium based contrast medium may be injected - unlike catheter angiography which uses a large volume of iodine-based contrast. (iowaclinic.com)
  • Studies were selected if gadolinium-enhanced MR angiography or color-guided DUS was done for the evaluation of arterial stenoses and occlusions in the workup for peripheral arterial disease of the lower extremities and if conventional angiography was used as the diagnostic standard. (acpjc.org)
  • The meta-analysis of the literature used appropriate techniques to obtain results that indicate that MR angiography has better diagnostic performance than does DUS and that MR angiography is a highly sensitive and specific method when conventional angiography is used as the diagnostic standard. (acpjc.org)
  • CA - Conventional angiography. (biomedcentral.com)
  • This is uncomfortable for the patient, and associated with risks of complications (bleeding, vascular damage, embolism).A novel approach to diagnosing atherosclerosis is the use of magnetic resonance angiography. (clinicaltrials.gov)
  • Rofsky NM, Johnson G, Adelman MA, Rosen RJ, Krinsky GA, Weinreb JC (1997) Peripheral vascular disease evaluated with reduced-dose gadolinium-enhanced MR angiography. (springer.com)
  • Abdominal aortic aneurysm: Detection of multilevel vascular pathology by time-resolved multiphase 3D gadolinium MR angiography: Initial report," Investigative Radiology , vol. 34, no. 10, pp. 648-659, 1999. (hindawi.com)
  • In addition, the continual monitoring of magnetic resonance signal changes postcontrast can provide consistent vascular permeability measurements in animal and human subjects ( 19 , 20 ). (aacrjournals.org)
  • The advantages of CE-MRA over Computed Tomographic Angiography (CTA), in the assessment of the pulmonary vasculature, are: (1) lack of ionizing radiation, (2) time-resolved imaging for perfusion, and (3) lack of iodinated contrast material. (springer.com)
  • How accurate is magnetic resonance angiography (MRA), with and without magnetic resonance venography (MRV), for diagnosing pulmonary embolism (PE) in adults? (annals.org)
  • Magnetic resonance angiography is used to generate images of arteries (and less commonly veins) in order to evaluate them for stenosis (abnormal narrowing), occlusions, aneurysms (vessel wall dilatations, at risk of rupture) or other abnormalities. (wikipedia.org)
  • In this paper, we present an efficient method to accurately develop realistic 3-D computational meshes of human intracranial arteries and aneurysms from serial magnetic resonance angiography images. (nih.gov)
  • Value of magnetic resonance angiography for the detection of intracranial aneurysms in autosomal dominant polycystic kidney disease. (asnjournals.org)
  • Postoperative assessment of clipped aneurysms with 64-slice computerized tomography angiography. (semanticscholar.org)
  • Intracranial aneurysms: evaluation by MR angiography. (semanticscholar.org)
  • Magnetic resonance angiogram (MRA) of the brain is a widely employed non-invasive test to diagnose aneurysms. (operativeneurosurgery.com)
  • Unlike a traditional angiogram, which requires inserting a catheter into the body, magnetic resonance angiography is a far less invasive and less painful test. (hopkinsmedicine.org)
  • Magnetic Resonance Angiography (MRA) is a method used to evaluate arteries and veins without the use of invasive catheters or x-rays (radiation). (clinicaltrials.gov)
  • Angiography is a minimally invasive medical test that helps physicians diagnose and treat medical conditions. (elsevier.com)
  • Background: Whole-body magnetic resonance angiography (WB-MRA) has shown its potential for the non-invasive assessment of nearly the entire arterial vasculature within one examination. (ahajournals.org)
  • Our experience suggested that gadolinium-enhanced magnetic resonance angiography is a sensitive non-invasive modality useful in the assessment of clinically significant renal artery stenosis. (hkmj.org)
  • The main finding is that non-invasive magnetic resonance perfusion imaging can guide patient management as safely as the currently used invasive coronary angiography supported by FFR in a population at high risk for cardiovascular events. (scmr.org)
  • MR-perfusion imaging is a non-invasive test based on magnetic resonance imaging, which measures the blood flow in the heart directly. (scmr.org)
  • Invasive coronary angiography is the current standard of care and adding FFR measurements has shown to improve outcome. (scmr.org)
  • Now, we can examine them with magnetic resonance imaging, a fast, non-invasive test, which does not require radiation. (scmr.org)
  • Coronary magnetic resonance angiography (MRA) is a promising technique for the non-invasive visualization of the coronary anatomy. (biomedcentral.com)
  • On a patient-based analysis, the sensitivity, specificity, positive and negative predictive value, and accuracy of MR angiography were 82% (95% confidence interval [CI] 69% to 91%), 90% (95% CI 79% to 96%), 88% (95% CI 74% to 95%), 86% (95% CI 75% to 93%), and 87% (95% CI 79% to 92%), respectively. (onlinejacc.org)
  • Prince MR, Narasimham DL, Stanley JC, Chenevert TL, Williams DM, Marx MV, Cho KJ (1995) Peripheral magnetic resonance angiography Breath-hold gadolinium-enhanced MR angiography of the abdominal aorta and its major branches. (springer.com)
  • Ho VB, Choyke PL, Foo TK, Hood MN, Miller DL, Czum JM, Aisen AM (1999a) Automated bolus chase peripheral MR angiography: initial practical experiences and future directions of this work-in-progress. (springer.com)
  • Owen RS, Carpenter JP, Baum RA, Perloff LJ, Cope C (1992) Magnetic resonance imaging of angiographically occult runoff vessels in peripheral arterial occlusive disease [see comments] Comment in: N Engl J Med (1992) 326(24): 1624-1626. (springer.com)
  • Dynamic contrast-enhanced magnetic resonance imaging: fundamentals and application to the evaluation of the peripheral perfusion," Cardiovasc Diagn Ther , vol. 4, pp. 147-164, 2014. (hindawi.com)
  • MRCA provides correct spatial relationships, whereas x-ray angiography provides a view of the entire coronary length and its peripheral run-off. (ucl.ac.uk)
  • Quiescent Interval Single Shot (QISS) has emerged as a robust technique for non-enhanced angiography of peripheral arteries (1). (biomedcentral.com)
  • Journal of Magnetic Resonance Imaging , 26 (2), 219-234. (elsevier.com)
  • Journal of Magnetic Resonance Imaging , 14 (6), 677-684. (elsevier.com)
  • Prabhakaran and colleagues describe a promising technique, quantitative MR angiography, as a screening tool for detecting intracranial in-stent stenosis. (ahajournals.org)
  • Using a 20% decrease in quantitative MR angiography vessel flow, they found that low blood flow measured by quantitative MR angiography at sites of intracranial stent placement was significantly associated with in-stent stenosis by catheter-based angiography. (ahajournals.org)
  • The utility of quantitative magnetic resonance angiography in the assessment of intracranial in-stent stenosis. (ahajournals.org)
  • Grist TM (1999) Magnetic resonance angiography of renal arterial stenosis. (springer.com)
  • Vasovist (EPIX Pharmaceuticals and Schering AG) is a newly developed blood pool contrast agent for magnetic resonance imaging with a high affinity for human albumin, making it an ideal tool for the detection of structural abnormalities such as stenosis and aneurysm. (ovid.com)
  • magnetic resonance angiography overestimated the degree of stenosis in 8% and underestimated it in 3% of them. (hkmj.org)
  • Computed tomographic angiography and gadolinium-enhanced magnetic resonance angiography have the best diagnostic accuracies for detecting renal stenosis. (acpjc.org)
  • Most important, the association of renal artery stenosis with hypertension does not establish causation (i.e., renovascular hypertension), and none of the screening tests examined in the meta-analysis nor renal angiography predicts a therapeutic response to revascularization. (acpjc.org)
  • Carpenter JP, Litt H, Gowda M. Magnetic resonance imaging and arteriography. (medlineplus.gov)
  • You've probably heard about the test called magnetic resonance imaging or MRI . (hopkinsmedicine.org)
  • During magnetic resonance angiography, you lie flat inside the magnetic resonance imaging scanner. (hopkinsmedicine.org)
  • With the invention of non-invasie magnetic resonance imaging (MRI) technique, imaging of flow has blossomed into a powerful technique to visualise blood flow in vessel, called MR Angiography (MRA). (medindia.net)
  • Available at: http://www.heart.org/HEARTORG/Conditions/HeartAttack/DiagnosingaHeartAttack/Magnetic-Resonance-Imaging-MRI_UCM_441632_Article.jsp#.WplqDmrwZxA. (epnet.com)
  • 16 17 18 The free choice of the imaging plane is an advantage over the limited possibilities of angulation in conventional coronary angiography. (ahajournals.org)
  • Given the earlier reported angiographic capabilities of the technique and the particular advantages of MR imaging techniques mentioned above, we postulated that MR angiography would be capable of depicting anomalous coronary anatomy and delineating precisely the proximal course of anomalous arteries. (ahajournals.org)
  • However, these techniques may be applied to any other form of imaging data including computed tomographic angiography. (nih.gov)
  • Available at: http://www.heart.org/HEARTORG/Conditions/HeartAttack/DiagnosingaHeartAttack/Magnetic-Resonance-Imaging-MRI%5FUCM%5F441632%5FArticle.jsp#.WplqDmrwZxA. (winchesterhospital.org)
  • Ho VB, Prince MR, Dong Q (1999b) Magnetic resonance imaging of the aorta and branch vessels. (springer.com)
  • Prince MR, Chenevert TL, Foo TK, Londy FJ, Ward JS, Maki JH (1997) Contrast-enhanced abdominal MR angiography: optimization of imaging delay time by automating the detection of contrast material arrival in the aorta. (springer.com)
  • Ruehm SG, Hany TF, Pfammatter T, Schneider E, Ladd M, Debatin JF (2000) Pelvic and lower extremity arterial imaging: diagnostic performance of three-dimensional contrast-enhanced MR angiography. (springer.com)
  • Magnetic resonance imaging/magnetic resonance angiography fusion technique for intraoperative navigation during microsurgical resection of cerebral. (nih.gov)
  • Magnetic resonance imaging/magnetic resonance angiography fusion technique for intraoperative navigation during microsurgical resection of cerebral arteriovenous malformations. (nih.gov)
  • If you've never experienced a magnetic resonance imaging (MRI) scan before, you might be anxious about what to expect. (osu.edu)
  • Evaluation of flow volume and flow patterns in the patent false lumen of chronic aortic dissections using velocity-encoded cine magnetic resonance imaging," Japanese Circulation Journal , vol. 64, no. 10, pp. 760-764, 2000. (hindawi.com)
  • This test uses a standard magnetic resonance imaging (MRI) unit. (annals.org)
  • In contrast, MR angiography is less operator dependent but more expensive, particularly with gadolinium imaging. (acpjc.org)
  • Another important finding, is that the total number of revascularizations was much smaller in the group assessed by magnetic resonance perfusion imaging. (scmr.org)
  • Coronary artery imaging in grown up congenital heart disease: complementary role of magnetic resonance and x-ray coronary angiography. (ucl.ac.uk)
  • The use of in vitro magnetic resonance tissue studies to optimise pulse sequences in the imaging of intracranial haemorrhage. (semanticscholar.org)
  • Magnetic resonance imaging of acute subarachnoid hemorrhage. (semanticscholar.org)
  • Intraaneurysmal flow visualization by using phase-contrast magnetic resonance imaging: feasibility study based on a geometrically realistic in vitro aneurysm model. (semanticscholar.org)
  • Reproducibility of total cerebral blood flow measurements using phase contrast magnetic resonance imaging. (semanticscholar.org)
  • A magnetic resonance imaging (MRI) scanner uses magnetic fields, radio waves and a computer to take pictures of the inside of your body. (wa.gov.au)
  • Magnetic resonance angiography (MRA) is an imaging test. (chnola.org)
  • A magnetic resonance imaging (MRI) scan is an imaging test that uses powerful magnets and radio waves to create pictures of the body. (adam.com)
  • 2] Moody, A.R. (2003) Magnetic Resonance Direct Thrombus Imaging. (scirp.org)
  • 13] Anzidei, M., Napoli, A. and Marincola, B. (2009) Gadofesveset-Enhanced MR Angiography of Carotid Arteries: Does Steady-State Imaging Improve Accuracy of First-Pass Imaging? (scirp.org)
  • 14] Hilfiker, P.R., Weishaupt, D. and Kacl, G.M. (1999) Comparison of Three Dimensional Magnetic Resonance Imaging in Conjunction with a Blood Pool Contrast Agent and Nuclear Scintigraphy for the Detection of Experimentally Induced Gastrointestinal Bleeding. (scirp.org)
  • 16] Cornelissen, S., Prokop, M. and Verhagen, H. (2010) Detection of Occult Endoleaks after Endovascular Treatment of Abdominal Aortic Aneurysm Using Magnetic Resonance Imaging with a Blood Pool Agent. (scirp.org)
  • Brain arterial vasculature can be visualized by magnetic resonance angiography (MRA). (nitrc.org)
  • Traditionally, time of flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) have been used to study arteries and veins. (appliedradiology.com)
  • To investigate the diagnostic performance of whole body magnetic resonance angiography (WB-MRA) using two different magnetic resonance contrast agents. (clinicaltrials.gov)
  • To evaluate the diagnostic accuracy of non-contrast magnetic resonance (MR) angiography in identifying crossing renal vessels in children younger than 4 years old with unilateral hydronephrosis. (springer.com)
  • Objectives We sought to determine the diagnostic performance of whole-heart coronary magnetic resonance (MR) angiography for detecting significant coronary artery disease. (onlinejacc.org)
  • MRA stands for Magnetic Resonance Angiogram or MR Angiography. (webmd.com)
  • Ear plugs are also sometimes helpful during a magnetic resonance angiogram. (ahealthyme.com)
  • Parasaggital gadolinium enhanced magnetic resonance angiography (left) demonstrates a uniform 3 cm narrowing in the proximal descending aorta (d), which terminates in a discrete stricture before returning to a normal calibre (a, ascending aorta). (bmj.com)
  • Herfkens, Robert J. / Magnetic resonance angiography of the aorta . (elsevier.com)
  • In Abrams' Angiography: Interventional Radiology: Third Edition Wolters Kluwer Health Adis (ESP). (elsevier.com)
  • It utilizes magnetic resonance (MR) technology to detect, diagnose and guide the treatment of heart disorders, stroke and blood vessel diseases. (iowaclinic.com)
  • Phase-contrast (PC-MRA) can be used to encode the velocity of moving blood in the magnetic resonance signal's phase. (wikipedia.org)
  • Three-dimensional phase-contrast MR angiography in the head and neck: preliminary report. (semanticscholar.org)
  • Laser Doppler velocimetry (LDV) and 3D phase-contrast magnetic resonance angiography (PC-MRA) velocity measurements: validation in an anatomically accurate cerebral artery aneurysm model with steady flow. (semanticscholar.org)
  • PURPOSE To verify the accuracy of velocity mapping with three-dimensional (3D) phase-contrast magnetic resonance angiography (PC-MRA) for steady flow in a realistic model of a cerebral artery aneurysm at a 3T scanner. (semanticscholar.org)
  • 1 Magnetic Resonance Angiography Course: Advance MRI (BIOE 594) Instructors: Dr Xiaohong Joe Zhou Dr. Shadi Othman By, Nayan Pasad Phase Contrast Angiography By Moran 1982, Bryan et. (technodocbox.com)
  • HCPCS code C8900 for Magnetic resonance angiography with contrast, abdomen as maintained by CMS falls under Magnetic Resonance Angiography, Trunk and Lower Extremities. (aapc.com)
  • Using a random-effects model, pooled sensitivity for MR angiography was higher than that for DUS (Table). (acpjc.org)
  • We postulated that with fast magnetic resonance (MR) angiography, accurate detection of anomalous coronary arteries and unambiguous delineation of their proximal course is feasible. (ahajournals.org)
  • Calder AD, Hiorns MP, Abhyankar A et al (2007) Contrast-enhanced magnetic resonance angiography for the detection of crossing renal vessels in children with symptomatic ureteropelvic junction obstruction: comparison with operative findings. (springer.com)
  • X-ray coronary angiography and respiratory-gated MRCA were performed in all subjects. (ucl.ac.uk)
  • MR without contrast enhancement may be a reliable, valid and safe alternative to contrast-enhanced MR angiography for identifying crossing renal vessels. (springer.com)
  • Pavicevic PK, Saranovic DZ, Mandic MJ et al (2015) Efficacy of magnetic resonance urography in detecting crossing vessels in children with ureteropelvic junction obstruction. (springer.com)
  • Review of these cases demonstrated that MR angiography had unambiguously visualized the proximal coronary artery course, whereas the results of x-ray angiography had been equivocal. (ahajournals.org)
  • Also included are articles on angiography of atherosclerotic plaque, functional techniques, and new contrast agents. (foyles.co.uk)
  • 12] Fink, C., Goyen, M. and Lotz, J. (2007) Magnetic Resonance Angiography with Blood-Pool Contrast Agents: Future Applications. (scirp.org)
  • Traditionally magnetic resonance angiography (MRA) of the carotid arteries has been performed with time-of-flight (TOF) methods, which are limited by flow related artifacts. (iospress.com)
  • Rationale and Objectives: To evaluate 4 doses of gadobenate dimeglumine (Gd-BOPTA) for contrast-enhanced magnetic resonance angiography (CE-MRA) of the pelvic arteries and to compare CE-MRA with unenhanced time-of-flight MRA (2D-TOF-MRA). (elsevier.com)
  • Both magnetic resonance approaches offer insight into the microscopic physiologic alterations associated with tumor vasculature. (aacrjournals.org)
  • High-resolution magnetic resonance angiography (MRA) offers a macroscopic view of the entire tumor vasculature. (aacrjournals.org)
  • Bley TA, Duffek CC, Francois CJ, Schiebler ML, Acher CW, Mell M, Grist TM, Reeder SB (2010) Presurgical localization of the artery of Adamkiewicz with time-resolved 3.0-T MR angiography. (springer.com)
  • 5 6 7 8 9 10 11 With the current standard technique for the assessment of coronary artery anatomy, ie, conventional x-ray coronary angiography, the exact proximal course of anomalous coronary arteries may sometimes be difficult to determine. (ahajournals.org)
  • Park SY, Kim CK, Kim E, Park BK (2015) Noncontrast-enhanced magnetic resonance renal angiography using a repetitive artery and venous labelling technique at 3 T: comparison with contrast-enhanced magnetic resonance angiography in subjects with normal renal function. (springer.com)
  • Significant coronary artery disease was defined on X-ray coronary angiography as a diameter reduction of ≥50% in coronary arteries with a reference diameter of ≥2 mm. (onlinejacc.org)
  • Intracranial circulation: preliminary clinical results with three-dimensional (volume) MR angiography. (semanticscholar.org)
  • Cerebral angiography confirmed a left dural CCF. (bmj.com)
  • We would like to report the usefulness of magnetic resonance angiography (MRA) with ultrashort echo time (TE) for the assessment of the cerebral aneurysm after clipping. (surgicalneurologyint.com)