Magnetic resonance angiography. Medical search

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)

Wikimedia Commons has media related to Magnetic resonance angiography. Magnetic+Resonance+Angiography at the US National ... 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 ...

https://en.wikipedia.org/wiki/Magnetic_resonance_angiography

Magnetic Resonance Angiography; view from the front Right subclavian artery Brachial plexus and subclavian artery Aberrant ...

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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 ...

https://en.wikipedia.org/wiki/Time_of_flight

Magnetic resonance angiography (MRA) generates pictures of the arteries to evaluate them for stenosis (abnormal narrowing) or ... List of neuroimaging software Magnetic immunoassay Magnetic particle imaging Magnetic resonance elastography Magnetic Resonance ... "Magnetic Resonance, a critical peer-reviewed introduction". European Magnetic Resonance Forum. Retrieved 17 November 2014. ... "Magnetic resonance spectroscopy and imaging for the study of fossils". Magnetic Resonance Imaging. Elsevier BV. 34 (6): 730-742 ...

https://en.wikipedia.org/wiki/Magnetic_resonance_imaging

"Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 15 October 2017. Keshavamurthy J, Ballinger R et al. " ... linearly varying magnetic field that adds or subtracts from the main magnetic field. This additional magnetic field will have ... "The Evolution of Magnetic Resonance Imaging: 3T MRI in Clinical Applications". eRADIMAGING.com. eRADIMAGING.com. Retrieved 24 ... "Magnetic Resonance Imaging". University of Wisconsin. Archived from the original on 10 May 2017. Retrieved 14 March 2016. ...

https://en.wikipedia.org/wiki/Physics_of_magnetic_resonance_imaging

Similar to DDS, Magnetic Resonance Angiography(MRA) also images blood vessels. MRA uses magnetic resonance and unlike a ... "Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... "Magnetic Resonance Angiography (MRA)". www.hopkinsmedicine.org. 19 November 2019. Retrieved 2020-12-10. Hartung, Michael P; ...

https://en.wikipedia.org/wiki/Kidney_ischemia

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. Archived from the original on 7 October 2017. Retrieved 29 April ... Magnetic resonance imaging, computed tomography, and ultrasound imaging have all enabled examination of internal structures in ... and magnetic resonance imaging.[citation needed] Derived from the Greek ἀνατομή anatomē "dissection" (from ἀνατέμνω anatémnō "I ...

https://en.wikipedia.org/wiki/Anatomy

Magnetic resonance angiography may be performed with or without contrast medium and is used to assess congenital or acquired ... Cardiac magnetic resonance imaging (cardiac MRI), also known as cardiovascular MRI, is a magnetic resonance imaging (MRI) ... "Representation of cardiovascular magnetic resonance in the AHA / ACC guidelines". Journal of Cardiovascular Magnetic Resonance ... "4D flow cardiovascular magnetic resonance consensus statement". Journal of Cardiovascular Magnetic Resonance. 17 (1): 72. doi: ...

https://en.wikipedia.org/wiki/Cardiac_magnetic_resonance_imaging

... facilitates high-resolution magnetic resonance angiography. Ferumoxytol (trade names Feraheme, Rienso), an ... enhanced magnetic resonance venography in children: comparison of gadofosveset trisodium with ferumoxytol". Pediatric Radiology ...

https://en.wikipedia.org/wiki/Gadofosveset

"Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... and magnetic resonance angiography (MRA), which avoids X-rays and nephrotoxic contrast agents. Angiography Computed tomography ... Intravenous digital subtraction angiography (IV-DSA) is a form of angiography which was first developed in the late 1970s. IV- ... Hence the term "digital subtraction angiography. Subtraction angiography was first described in 1935 and in English sources in ...

https://en.wikipedia.org/wiki/Digital_subtraction_angiography

"Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... MRV is based on the phenomenon of nuclear magnetic resonance and adapts a medical magnetic resonance imaging system for the ... Elkins, C.; Alley, M.T. (2007). "Magnetic resonance velocimetry: applications of magnetic resonance imaging in the measurement ... Elkins, C.; Alley, M.T. (2007). "Magnetic resonance velocimetry: applications of magnetic resonance imaging in the measurement ...

https://en.wikipedia.org/wiki/Magnetic_resonance_velocimetry

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 ...

https://en.wikipedia.org/wiki/Renal_vein_thrombosis

"Magnetic resonance angiography: current status and future directions". Journal of Cardiovascular Magnetic Resonance. 13 (1): 19 ... Phase contrast magnetic resonance imaging (PC-MRI) is a specific type of magnetic resonance imaging used primarily to determine ... PC-MRI can be considered a method of Magnetic Resonance Velocimetry. It also provides a method of magnetic resonance ... Elkins, C.; Alley, M.T. (2007). "Magnetic resonance velocimetry: applications of magnetic resonance imaging in the measurement ...

https://en.wikipedia.org/wiki/Phase_contrast_magnetic_resonance_imaging

Branches of external carotid artery Magnetic resonance angiography "Carotid artery". WebMD. Retrieved 28 July 2015. Ryan, ...

https://en.wikipedia.org/wiki/External_carotid_artery

... magnetic resonance angiography, perfusion and diffusion". Journal of Cardiovascular Magnetic Resonance. 13 (1): 70. doi:10.1186 ...

https://en.wikipedia.org/wiki/Renal_artery_stenosis

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 ...

https://en.wikipedia.org/wiki/Arteritis

... 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 ...

https://en.wikipedia.org/wiki/Coarctation_of_the_aorta

Magnetic Resonance Angiography (MRA)- looks at the blood vessels in the brain. In the diagnosis of brain tumor, MRAs are ... Perfusion Magnetic Resonance Imaging (pMRI)- assess the blood volume and blood flow of different parts of the brain and brain ... "MRI (magnetic resonance imaging)". mayfieldclinic.com. Retrieved 28 November 2022. Cha S (October 2004). "Perfusion MR imaging ... Iv M, Yoon BC, Heit JJ, Fischbein N, Wintermark M (January 2018). "Current Clinical State of Advanced Magnetic Resonance ...

https://en.wikipedia.org/wiki/Brain_tumor

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 ...

https://en.wikipedia.org/wiki/MRI_sequence

Prior to this, conventional angiography had been in use for 70 years. Angiography Magnetic resonance angiography Wortman JR, ... Because of this, magnetic resonance angiography is used more often for this purpose. CTA can be used in the legs to detect ... Computed tomography angiography (also called CT angiography or CTA) is a computed tomography technique used for angiography-the ... Coronary CT angiography (CCTA) is the use of CT angiography to assess the arteries of the heart. The patient receives an ...

https://en.wikipedia.org/wiki/Computed_tomography_angiography

... 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 ...

https://en.wikipedia.org/wiki/Blood_pool_agent

Angiography, CT scan, magnetic resonance imaging, medical ultrasound, or interventional radiology may be used. The confluence ...

https://en.wikipedia.org/wiki/Confluence_of_sinuses

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 ...

https://en.wikipedia.org/wiki/Intracranial_aneurysm

... 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 ...

https://en.wikipedia.org/wiki/Carotid-cavernous_fistula

These may include angiography, magnetic resonance imaging (MRI), and/or computed tomography (CT scan). The coronary arteries ...

https://en.wikipedia.org/wiki/Arterial_switch_operation

In 1989, capability for magnetic resonance imaging (MRI) and digital subtraction angiography (DSA) was introduced. Northern ... Melvin, Tessa (September 18, 1988). "Magnetic Imaging Approved for County". The New York Times. The New York Times. Retrieved 5 ...

https://en.wikipedia.org/wiki/Northern_Westchester_Hospital

... 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 on the "string of beads" angiography for a diagnosis. In fact, it is suggested ...

https://en.wikipedia.org/wiki/Fibromuscular_dysplasia

Other diagnostical tools are duplex ultrasonography, computed tomography angiography (CTA), and magnetic resonance angiography ...

https://en.wikipedia.org/wiki/Acute_limb_ischaemia

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 ...

https://en.wikipedia.org/wiki/Babinski–Nageotte_syndrome

Magnetic resonance angiography (MRA) and doppler US can also be utilized as additional non-invasive imaging techniques. The ... or magnetic resonance imaging (MRI) and will also guide therapeutic decision making. MRI, with a fat-suppressed T1 sequence, is ... However, other modalities exist with helical computed topographic angiography (CTA) becoming the new gold-standard. ...

https://en.wikipedia.org/wiki/Cervical_artery_dissection

CT scan, bronchoscopy, bronchography and Magnetic resonance imaging also contributes to the observation of patients' lung ... Pulmonary angiography assists in detecting the presence of pulmonary artery branches, differentiating pulmonary agenesis to ...

https://en.wikipedia.org/wiki/Pulmonary_agenesis

"Cardiovascular magnetic resonance physics for clinicians: part I". Journal of Cardiovascular Magnetic Resonance. 12 (1): 71. ... Computed tomography angiography (CTA), an imaging methodology using a ring-shaped machine with an X-ray source spinning around ... Magnetic resonance imaging visualises the heart by detecting hydrogen atoms using superconducting magnets, particularly those ... Cardiac imaging refers to non-invasive imaging of the heart using ultrasound, magnetic resonance imaging (MRI), computed ...

https://en.wikipedia.org/wiki/Cardiac_imaging

The most common modalities are Computerized Tomography (CT scan) and Magnetic Resonance Imaging (MRI) scanner. Three ... Furthermore, CT Angiography has been used to provide the imaging data for analysing the deceased. The work output of these ... or Magnetic Resonance Imaging (MRI) scans, is used to develop three-dimensional images for a virtual exploration of a human ... The main constraint is the data that is provided by medical imaging modalities are based on X-Ray and Magnetic fields (CT and ...

https://en.wikipedia.org/wiki/Digital_autopsy

It is still not clear whether magnetic resonance venography, venous angiography, or Doppler sonography should be considered the ... Use of magnetic resonance venography for the diagnosis of CCSVI in MS patients has been proposed by some to have limited value ... Others have stated that magnetic resonance venography is a valid measure which has advantages over Doppler including the fact ... April 2010). "Use of neck magnetic resonance venography, Doppler sonography and selective venography for diagnosis of chronic ...

https://en.wikipedia.org/wiki/Chronic_cerebrospinal_venous_insufficiency_controversy

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. Exercise can improve symptoms, as can ...

https://en.wikipedia.org/wiki/Intermittent_claudication

... of the coronary arteries that has been previously identified either by standard coronary angiography or CT coronary angiography ... Cardiac magnetic resonance imaging perfusion (cardiac MRI perfusion, CMRI perfusion), also known as stress CMR perfusion, is a ... Wilke NM, Jerosch-Herold M, Zenovich A, Stillman AE (1999). "Magnetic resonance first-pass myocardial perfusion imaging: ... 2008). "MR-IMPACT: comparison of perfusion-cardiac magnetic resonance with single-photon emission computed tomography for the ...

https://en.wikipedia.org/wiki/Cardiac_magnetic_resonance_imaging_perfusion

"Assessment of Left Ventricular Mass by Cardiovascular Magnetic Resonance". Hypertension. 39 (3): 750-755. doi:10.1161/ ... the Society for Cardiovascular Angiography and Interventions, and the Society of Thoracic Surgeons: Endorsed by the American ... Myocardial Thickness for Middle-Aged and Older Subjects With Steady-State Free Precession Cardiac Magnetic Resonance". ...

https://en.wikipedia.org/wiki/Left_ventricular_hypertrophy

A Clinical Study of Gadoteric Acid in Non-Coronary Magnetic Resonance (MR) Angiography, 25 November 2008 Knör, S; Modlinger, A ...

https://en.wikipedia.org/wiki/DOTA_(chelator)

Magnetic resonance venography employs the same principles, but uses MRI as a scanning modality. MRI has the advantage of being ... Cerebral angiography may demonstrate smaller clots than CT or MRI, and obstructed veins may give the "corkscrew appearance". ... The diagnosis is usually by computed tomography (CT scan) or magnetic resonance imaging (MRI) to demonstrate obstruction of the ... and magnetic resonance imaging (MRI), both using various types of radiocontrast to perform a venogram and visualise the veins ...

https://en.wikipedia.org/wiki/Cerebral_venous_sinus_thrombosis

"Targeted endomyocardial biopsy guided by real-time cardiovascular magnetic resonance". Journal of Cardiovascular Magnetic ... Baim, Donald S. (2006). Grossman's Cardiac Catheterization, Angiography, and Intervention. Lippincott Williams & Wilkins. p. ... Resonance. 19 (1): 45. doi:10.1186/s12968-017-0357-3. ISSN 1097-6647. PMC 5395773. PMID 28424090. Asher, Alex (July 2017). "A ...

https://en.wikipedia.org/wiki/Bioptome

"What you should know about prophylaxis and treatment of radiographic and magnetic resonance contrast medium extravasation". ... CT-angiography in a 70kg person, with 100-150 mg I/kg by using 80 kVp, mAs-compensation for constant CNR, fixed injection ... The main phases thereof are as follows: CT angiography is a contrast CT taken at the location and corresponding phase of the ... For example, an abdominal aortic angiography is taken in the arterial phase in the abdominal level, and is useful to detect for ...

https://en.wikipedia.org/wiki/Contrast_CT

... is built from the basic physics of magnetic resonance imaging where there is spin-spin relaxation, that is ... A Study Using MRI-Enhanced Gradient Echo T2 Star-Weighted Angiography". PLOS ONE. 10 (2): e0116632. Bibcode:2015PLoSO..1016632Z ... Articles with short description, Short description is different from Wikidata, Magnetic resonance imaging). ... for most magnetic resonance experiments, this "relaxation" dominates. This results in dephasing. However, decoherence because ...

https://en.wikipedia.org/wiki/T2*-weighted_imaging

... magnetic resonance imaging, radiography, digital subtraction angiography), radiation therapy, radiation dosimeters and nuclear ... Magnetic Resonance in Medicine (8th ed.). Odeblad E; Lindström G (1955). "Some preliminary observations on the proton magnetic ... MRI NMR Magnetic Resonance • Essentials, introduction, basic principles, facts, history - The primer of EMRF/TRTF". magnetic- ... The history of magnetic resonance imaging includes many researchers who have discovered NMR and described its underlying ...

https://en.wikipedia.org/wiki/Radiographer

Society for Cardiovascular Angiography and, Interventions; Society for Cardiovascular Magnetic, Resonance; Kramer, CM; Berman, ... the Society for Cardiovascular Angiography and Interventions, and the Society for Cardiovascular Magnetic Resonance". Journal ... Coronary computed tomography angiography should not be used to screen people who are asymptomatic. Additionally, this test ... "Coronary Computed Tomography Angiography as a Screening Tool for the Detection of Occult Coronary Artery Disease in ...

https://en.wikipedia.org/wiki/Overscreening

CT scans, Magnetic Resonance Imaging (MRI) and Magnetic Resonance Angiography (MRA) are all common techniques which allow the ...

https://en.wikipedia.org/wiki/Migrainous_infarction

CT angiography and Magnetic Resonance Angiography (MRA) can be used to detect atherosclerosis and other diseases in the ... "CT angiography of the cerebral arteries (protocol) , Radiology Reference Article". Radiopaedia.org. Retrieved 26 April 2022. ...

https://en.wikipedia.org/wiki/Vertebrobasilar_insufficiency

A child development center opened in the 1980s, along with digital angiography, magnetic resonance imaging (MRI), and alcohol ...

https://en.wikipedia.org/wiki/Rogue_Regional_Medical_Center

... magnetic resonance imaging and computerized tomography. Although coronary angiography remains to be the gold standard, the ... This rare disorder occurs in about 0.3-4.9% of patients who undergo coronary angiography. Acquired causes include ... a consequence of direct wall infiltration or immune complex deposition It is often found coincidentally on coronary angiography ...

https://en.wikipedia.org/wiki/Coronary_artery_aneurysm

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 ... "Natural history of perihematomal edema after intracerebral hemorrhage measured by serial magnetic resonance imaging". Stroke. ...

https://en.wikipedia.org/wiki/Intracerebral_hemorrhage

Andrei Sakharov Magnetic Resonance Imaging (MRI) Facility, the first of its kind in Manitoba, has three MRI scanners. The ... It provides: angiography, bone density imaging, CT scans, MRIs, mammography, nuclear medicine tests, ultrasounds and X-rays. St ... Research carried out at the centre has been published in the Journal of Magnetic Resonance Imaging. The I. H. Asper Clinical ... "Magnetic Resonance Imaging". St. Boniface Hospital Research Centre. 2007. Retrieved 4 April 2012. Scott, Ann (March 2004). " ...

https://en.wikipedia.org/wiki/Saint_Boniface_Hospital

Interventional radiology Intravascular ultrasound Intravenous digital subtraction angiography Magnetic resonance angiography ... The term angiography has been applied to radionuclide angiography and newer vascular imaging techniques such as CO2 angiography ... CT angiography and MR angiography. The term isotope angiography has also been used, although this more correctly is referred to ... Pulmonary angiography is used to visualise the anatomy of pulmonary vessels. Angiography is also commonly performed to identify ...

https://en.wikipedia.org/wiki/Angiography

These tests include: Pelvic and Transvaginal Ultrasound Pelvic Venogram Computed Tomography (CT) Magnetic Resonance Imaging ( ... Angiography: Sometimes referred to as traditional angiography, catheter angiography or digital subtraction angiography (DSA.) A ... Plaque and blood flow can be evaluated using ultrasound, CT angiography, MR angiography, and catheter-based angiography to ... Angiography provides the basis for all endovascular therapy. Balloon angiography: The foundational IR procedure. Small balloons ...

https://en.wikipedia.org/wiki/Interventional_radiology

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: Libby, P, Bonow RO, Mann DL, Tomaselli, GF, Bhatt DL, Solomon SD. Braunwalds ...

https://medlineplus.gov/ency/article/007269.htm

Unlike traditional angiography that involves placing a tube (catheter) into the body. ... 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 ... MRA; Angiography - magnetic resonance. How the Test is Performed. You may be asked to wear a hospital gown. You can also wear ...

https://www.ucsfhealth.org/medical-tests/magnetic-resonance-angiography

Angiography. Spinal angiography is indicated for large neoplasms when the diagnosis is indeterminate on MRI. [14] Angiography ... Magnetic resonance imaging (MRI) of the spine is the diagnostic imaging examination of choice. [7, 8, 9] Advances in 3- ... Magnetic Resonance Imaging. Because spinal hemangioblastomas are relatively rare and share some of the same imaging features ... Feasibility of a novel diagnostic chart of intramedullary spinal cord tumors in magnetic resonance imaging. Spinal Cord. 2014 ...

http://emedicine.medscape.com/article/345314-overview

... magnetic resonance (MR) angiography in patients with hilar cholangiocarcinoma, and to compare its efficacy with intraarterial ... Determination of hepatic arterial and/or portal invasion from cholangiocarcinoma was compared between MR angiography and DSA as ... In distinguishing portal venous invasion, these were 78%, 91%, and 89%, respectively, with MR angiography; 78%, 92%, and 90%, ... The data presented here indicate that noninvasive contrast-enhanced 3D FISP MR angiography has the potential to replace DSA in ...

https://www.semanticscholar.org/paper/Preoperative-Evaluation-of-Hilar-Cholangiocarcinoma-Lee-Park/d2ced70cdbd7a543c620fe7304a77e5706a8109b

REZ). The facial nerve REZ refers to the part where facial nerve exits from the pons. This article is available only as a ... Role of Magnetic Resonance Imaging and Magnetic Resonance Angiography in Patients with Hemifacial Spasm. E K Tan, L L Chan, S H ... we described the magnetic resonance imaging (MRI) and three-dimensional magnetic resonance angiography (MRA) techniques used ... Implementation of an AI model to triage paediatric brain magnetic resonance imaging orders. Phua Hwee Tang, Alwin Yaoxian Zhang ...

https://annals.edu.sg/role-of-magnetic-resonance-imaging-and-magnetic-resonance-angiography-in-patients-with-hemifacial-spasm/

Crescent Sign on Magnetic Resonance Angiography Denotes Incomplete Stent Apposition and Correlates with Diffusion-Weighted ... Methods: Post-procedural 3.0 Tesla (3T) magnetic resonance (MR) diffusion-weighted imaging and time-of-flight angiography were ... Conclusions: Incomplete stent apposition is detectable on 3T-MR angiography as a Crescent Sign and was found to be highly ... Results: A distinctive semi-lunar signal pattern was identified using 3T-MR angiography showing flow outside the confines of ...

https://www.cns.org/meetings/archived-abstracts-detail/congress-of-neurological-surgeons-2011-annual-meeting-10169

Contrast-enhanced intracranial magnetic resonance angiography with a spherical shells trajectory and online gridding ... Dive into the research topics of Contrast-enhanced intracranial magnetic resonance angiography with a spherical shells ...

https://mayoclinic.pure.elsevier.com/en/publications/contrast-enhanced-intracranial-magnetic-resonance-angiography-wit/fingerprints/

Four-Vessel Cerebral Angiography. Prior to the development of noninvasive techniques such as magnetic resonance imaging (MRI) ... Magnetic resonance angiography. MRA can identify abnormalities that are characteristic of the disturbed arterial flow seen in ... Data examining CTA versus magnetic resonance imaging-angiography (MRI-A)/MRA for VAD are limited, but there may be a slight ... Thus, ultrasonography may be useful as an initial test only if computed tomography angiography (CTA) or magnetic resonance ...

https://www.medscape.com/answers/761451-111134/what-is-the-role-of-duplex-ultrasonography-in-the-workup-of-vertebral-artery-dissection-vad

Stroke and Vascular Neurology Feb 2022, 7 (1) 6-12; DOI: 10.1136/svn-2021-001122 ...

https://svn.bmj.com/keyword/magnetic-resonance-angiography

... a comparison between angiography, electrocardiography and cardiovascular magnetic resonance measures of microvascular injury. J ... Journal of Cardiovascular Magnetic Resonance volume 10, Article number: A24 (2008) Cite this article ... Cardiovascular magnetic resonance (CMR) allows direct visualization and quantification of microvascular obstruction (MVO) with ... electrocardiography and cardiovascular magnetic resonance measures of microvascular injury. *Robin Nijveldt1, ...

https://jcmr-online.biomedcentral.com/articles/10.1186/1532-429X-10-S1-A24

... (MRA) is a form of magnetic resonance imaging (MRI) that uses radio waves and a magnetic field ... Magnetic resonance angiography, or MRA, is a form of magnetic resonance imaging (MRI) that, like MRI, uses radiowaves and ... The MRA table automatically slides through a hollow, donut-shaped chamber that exposes the patient to a magnetic field and ... Physicians may use MRA to get information that is similar to information from an invasive angiography procedure. ...

https://www.cheyenneregional.org/location/heart-and-vascular-institute/patient-education/patient-resources/tests/magnetic-resonance-angiography/

Materials and methods: Histological analysis and in vivo magnetic resonance angiography protocols based on time of flight (TOF ... and contrast-enhanced (CE) angiography were applied to evaluate cerebrovascular alterations. Results Histological analysis ... Detection of vascular alterations by in vivo magnetic resonance angiography and histology in APP/PS1 mouse model of Alzheimers ... Detection of vascular alterations by in vivo magnetic resonance angiography and histology in APP/PS1 mouse model of Alzheimers ...

https://hal-cnrs.archives-ouvertes.fr/hal-03236874

The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures. MeSH ... Magnetic Resonance Imaging » Magnetic Resonance Angiography ...

https://www.cdek.liu.edu/mesh/D018810/

Magnetic resonance angiography or MRA is a type of imaging test that allows a healthcare provider to look at the bodys blood ...

https://encyclopedia.nm.org/Library/Wellness/InjuriesEmergencies/135,14

Society for Magnetic Resonance Angiography. 33rd Annual International Conference. September 10 to 12, 2021 ... physicists and other imaging scientists who want to increase their knowledge of Magnetic Resonance Angiography and Vascular ...

https://society4mra.org/index.php/annual-meeting/

This work may make the T1 MRI contrast agents for high-resolution angiography possible and offer a new candidate for ... Contrast-enhanced MR angiography (MRA) is a critical technique for vascular imaging. Nevertheless, the efficacy of MRA is ... From: High relaxivity Gd3+-based organic nanoparticles for efficient magnetic resonance angiography ...

https://jnanobiotechnology.biomedcentral.com/articles/10.1186/s12951-022-01363-3/figures/4

mDixon ECG-gated 3-dimensional cardiovascular magnetic resonance angiography in patients with congenital cardiovascular disease ... mDixon ECG-gated 3-dimensional cardiovascular magnetic resonance angiography in patients with congenital cardiovascular disease ...

https://profiles.uchicago.edu/profiles/display/17458525

Other studies that may be considered are computed tomography (CT) angiography (CTA), magnetic resonance angiography (MRA), and ... The costs and effects of contrast-enhanced magnetic resonance angiography and digital substraction angiography on quality of ... Magnetic Resonance Angiography. MRA is useful for imaging large and small vessels. Although it was initially considered to ... Standard Angiography. Angiography is still the criterion standard arterial imaging study for the diagnosis of PAOD (see the ...

https://www.staging.medscape.com/answers/460178-119067/what-is-the-role-of-cta-in-the-workup-of-peripheral-arterial-occlusive-disease-paod

Magnetic resonance angiography (MRA) - NECK answers are found in the Guide to Diagnostic Tests powered by Unbound Medicine. ... angiography__MRA____NECK. Nicoll DD, Lu CMC, McPhee SJS. Magnetic resonance angiography (MRA) - NECK. Guide to Diagnostic Tests ... angiography__MRA____NECK. Nicoll DD, Lu CMC, McPhee SJS. Magnetic Resonance Angiography (MRA) - NECK [Internet]. In: Guide to ... "Magnetic Resonance Angiography (MRA) - NECK." Guide to Diagnostic Tests, 7th ed., McGraw-Hill Education, 2017. Emergency ...

https://emergency.unboundmedicine.com/emergency/view/GDT/619429/all/Magnetic_resonance_angiography__MRA____NECK

MEDICARE ANNOUNCES EXPANDED COVERAGE OF MAGNETIC RESONANCE ANGIOGRAPHY The Centers for Medicare & Medicaid Services (CMS) today ... announced it intends to expand diagnostic options for certain Medicare beneficiaries by making Magnetic Resonance Angiography ( ...

https://www.cms.gov/newsroom/search?search_api_language=en&%3Bsort_by=field_date&%3Bsort_order=DESC&%3Bitems_per_page=10&%3Bf%5B0%5D=topic%3A51&f%5B0%5D=content_type%3Apress_releases&f%5B1%5D=topic%3A176&f%5B2%5D=topic%3A231&f%5B3%5D=topic%3A436&f%5B4%5D=topic%3A671

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 - How Long Will It Take?. 40-90 minutes. Magnetic resonance angiography - Will It Hurt?. The ... Home/Tests, procedures and surgery/Magnetic resonance angiography. Tests, procedures and surgery Magnetic resonance angiography ... Magnetic resonance angiography - Definition. MRA is a study of the blood vessels using magnetic resonance imaging (MRI). Using ...

https://mednhealth.com/magnetic-resonance-angiography.html

title = "Contrast-Enhanced Magnetic Resonance Angiography (CE MRA)",. author = "{van Ormondt}, D and {de Beer}, R and FTAW ... Contrast-Enhanced Magnetic Resonance Angiography (CE MRA). / van Ormondt, D; de Beer, R; Wajer, FTAW. ... Contrast-Enhanced Magnetic Resonance Angiography (CE MRA). Delft : Technische Universiteit Delft, 1999. 5 p. ... van Ormondt, D, de Beer, R & Wajer, FTAW 1999, Contrast-Enhanced Magnetic Resonance Angiography (CE MRA). Technische ...

https://research.tudelft.nl/en/publications/contrast-enhanced-magnetic-resonance-angiography-ce-mra

Chapter 6 Magnetic Resonance Angiography of Aortic Diseases ... By Shobhit Madan, Soma Mandal and Sameh S. Tadros ... Intracranial Plaque Imaging Using High-Resolution Magnetic Resonance Imaging: A Pictorial Review. Written By ... Magnetic Resonance Angiography Basics to Future Edited by Wael Shabana. Magnetic Resonance Angiography. Edited by Wael Shabana ...

https://www.intechopen.com/chapters/32793

Magnetic Resonance Angiography. *. David J. Hur, MD, FACC. Assistant Professor; Cardiology Director of Structural Heart Disease ...

https://medicine.yale.edu/dfri/research-profiles/?orgId=116262&meshId=17514

Magnetic Resonance Angiography* * Middle Aged ... detection by dynamic MR projection angiography AJR Am J ...

https://pubmed.ncbi.nlm.nih.gov/10789780/?dopt=Abstract

magnetic resonance angiography Once a doctor has diagnosed carotid artery disease, they will recommend treatment options to ...

https://www.medicalnewstoday.com/articles/carotid-artery?utm_source=ReadNext

Key Words: Intracranial aneurysm; Junctional dilatation; Magnetic resonance angiography; Digital subtraction angiography ... We hypothesized that detection rates of cerebral aneurysms via magnetic resonance angiography (MRA) screening may increase ... Diagnosis of Cerebral Aneurysm Via Magnetic Resonance Angiography Screening: Emphasis on Legal Responsibility Increases False ... False positive diagnoses of cerebral aneurysm via magnetic resonance angiography (MRA) screening may increase unnecessary ...

https://neurointervention.org/journal/view.php?number=152

Neurovascular Magnetic Resonance Angiography. 31. Neurovascular Vessel Wall Imaging: New Techniques and Clinical Applications ... Part 11: Advanced Magnetic Resonance Spectroscopy. 32. Single Voxel Magnetic Resonance Spectroscopy: Principles and ... Magnetic Resonance Spectroscopic Imaging: Principles and Applications". 34. Non-Fourier-Based Magnetic Resonance Spectroscopy ... Challenges and Applications of Ultra-High Field Magnetic Resonance. 36. Neuroscience Applications of Ultra-High-Field Magnetic ...

https://www.elsevier.com/books/advanced-neuro-mr-techniques-and-applications/choi/978-0-12-822479-3

Magnetic Resonance Angiography. Further information. Always consult your healthcare provider to ensure the information ... The use of magnetic resonance imaging in the obstetric patient. J Obstet Gynaecol Can. 2014;36:349-63. [PubMed: 24798674] ...

https://www.drugs.com/breastfeeding/gadofosveset.html

Cardiovascular magnetic resonance imaging. (medlineplus.gov)
Carpenter JP, Litt H, Gowda M. Magnetic resonance imaging and arteriography. (ucsfhealth.org)
Magnetic resonance imaging (MRI) of the spine is the diagnostic imaging examination of choice. (medscape.com)
We sought to evaluate the image quality of double-dose, contrast-enhanced 3D fast imaging with steady-state precession (FISP) magnetic resonance (MR) angiography in patients with hilar cholangiocarcinoma, and to compare its efficacy with intraarterial digital subtraction angiography (DSA). (semanticscholar.org)
In this study, we described the magnetic resonance imaging (MRI) and three-dimensional magnetic resonance angiography (MRA) techniques used and findings in 34 patients with hemifacial spasm. (annals.edu.sg)
Post-procedural 3.0 Tesla (3T) magnetic resonance (MR) diffusion-weighted imaging and time-of-flight angiography were obtained in 58 patients undergoing aneurysm stent-coiling using the Enterprise closed-cell and Neuroform open-cell self-expanding intracranial micro-stents. (cns.org)
Magnetic resonance angiography (MRA) is a form of magnetic resonance imaging (MRI) that uses radio waves and a magnetic field to noninvasively and painlessly show the structure of blood vessels and the blood flow within the blood vessels. (cheyenneregional.org)
Magnetic resonance angiography, or MRA, is a form of magnetic resonance imaging (MRI) that, like MRI, uses radiowaves and magnetic fields to create images of the organs and tissues inside the body. (cheyenneregional.org)
This meeting is aimed at radiologists, technologists, physicists and other imaging scientists who want to increase their knowledge of Magnetic Resonance Angiography and Vascular Imaging. (society4mra.org)
MRA is a study of the blood vessels using magnetic resonance imaging (MRI). (mednhealth.com)
Angiography is the recommended imaging study. (medscape.com)
Angiography is still the criterion standard arterial imaging study for the diagnosis of PAOD (see the image below). (medscape.com)
The use of magnetic resonance imaging in the obstetric patient. (drugs.com)
The hospital is accredited by the American College of Radiology (ACR) for computed tomography, nuclear medicine, mammography, magnetic resonance imaging and ultrasound. (centennialhillshospital.com)
Magnetic Resonance Angiography (MRA) is the use of MRI imaging to study a patient's blood vessels after the injection of a contrast material. (centennialhillshospital.com)
Magnetic resonance imaging uses radio waves and a strong magnetic field to create clear, detailed images of internal organs and tissues. (centennialhillshospital.com)
This procedure is also called nuclear magnetic resonance imaging (NMRI). (medicinenet.com)
Magnetic resonance imaging (MRI) of the brain revealed temporal foci suggestive of white matter demyelination. (cdc.gov)
Computed tomography (CT) scanning, magnetic resonance imaging (MRI), angiography, and transesophageal echocardiography are most often used to assess thoracic aneurysm in the emergent setting. (medscape.com)
Eovist ® is indicated for intravenous use in magnetic resonance imaging (MRI) of the liver to detect and characterize lesions in patients with known or suspected focal liver disease. (bayer.com)
Specific focuses has been on hemodynamic mapping by full-field phase-contrast magnetic resonance imaging (4D Flow MRI), with coupled physics-informed analysis allowing for regional hemodynamic quantifications across the cardiovascular system. (ki.se)
We aimed to investigate the relationship between the locations of Min-WSS points and their underlying intra-aneurysmal flow structure patterns in unruptured cerebral aneurysms using four-dimensional (4D) flow magnetic resonance imaging (MRI). (bvsalud.org)
Other imaging tests (computed tomography and magnetic resonance imaging) and blood tests are done to identify the cause of the stroke. (msdmanuals.com)
This indicator measures the total number and density per million populations (females aged 50-60 years in case of Mammography) on the availability and use of 6 medical devices - Computed Tomography (CT) scanners, Magnetic Resonance Imaging (MRI) units, Gamma Cameras, Mammography, Angiography Units, and Lithotripters. (who.int)
New diagnostic techniques (transesophageal echocardiography, cardiac magnetic resonance imaging) have allowed clinicians to better characterize well-established sources of embolism and to discover other potential etiologies of cardioembolic stroke (see the following image). (medscape.com)
Over the past couple years covering the news about gadolinium-based contrast agent (GBCA) retention in the brain, skin and bones of patients who received contrast magnetic resonance imaging (MRI) exams, a few key safety red flags popped up for me. (itnonline.com)
The equipment that radiographers use includes X-ray, ultrasound, computed tomography (CT) and magnetic resonance imaging (MRI). (unischolars.com)
Diagnosis can be established by clinical examination, Doppler ultrasound, computed tomography (CT), magnetic resonance imaging (MRI), and venography. (springeropen.com)
Investigations / Tests - Diagnostic imaging studies of the spine, such as CT, MRI, spine angiography etc may be performed to provide your surgeon with anatomic details for surgery. (singhealth.com.sg)
The aim of study was to investigate epidemiology aspects of magnetic resonance imaging (MRI) during COVID-19 pandemic. (bvsalud.org)

We included 56 consecutive patients who were referred with suspected aneurysm based on MRA or computed tomography angiography (CTA) and showed no aneurysm on subsequent digital subtraction angiography (DSA). (neurointervention.org)

Radiology is the area of medicine that uses X-rays, magnetic waves and ultrasound to obtain detailed images of the inside of the body. (centennialhillshospital.com)
The multiplanar ability of generating images in axial, coronal and sagittal planes are provided by computed tomography (CT), magnetic resonance, ultrasound and cone beam computed tomography (CBCT). (bvsalud.org)

A study that compared MRA with conventional angiography in regard to quality of life and cost-effectiveness found that although MRA was nearly 20% cheaper, there was no difference in quality of life. (medscape.com)
Unlike conventional angiography, which is an invasive procedure, MRA is noninvasive other than an injection with a needle to administer the contrast material. (centennialhillshospital.com)
Duplication of arteries usually occurs as two parallel arteries from two separate origins, as seen on CTA, MRA, and conventional angiography. (radiologykey.com)
Duplication of a portion of an artery whose main trunk is derived from a single origin, as seen on CTA, MRA, and conventional angiography. (radiologykey.com)

We assessed the temporal profile of intracranial arteries by 9.4-T magnetic resonance angiography (MRA) continuously in the same mouse up to 64 weeks of age. (elsevier.com)
CT angiography (CTA) can also be used to evaluate patency or occlusion of intracranial venous sinuses and veins. (radiologykey.com)

Cardiovascular magnetic resonance (CMR) allows direct visualization and quantification of microvascular obstruction (MVO) with transmural resolution. (biomedcentral.com)
mDixon ECG-gated 3-dimensional cardiovascular magnetic resonance angiography in patients with congenital cardiovascular disease. (uchicago.edu)
[ 9 ] Routine coronary angiography improved survival significantly, and no deaths or cardiovascular events were reported. (medscape.com)

Other studies that may be considered are computed tomography (CT) angiography (CTA), magnetic resonance angiography (MRA), and duplex ultrasonography. (medscape.com)
[9] Duplex ultrasonography and angiography may also be used. (wikipedia.org)

The fluorescein angiography (Fig. 1B) shows filling of the malformation without exudation. (canadianjournalofophthalmology.ca)
A pigmentary retinopathy is present in about 50% of patients and fluorescein angiography reveals a mottled hyperfluorescence. (arizona.edu)

Physicians may use MRA to get information that is similar to information from an invasive angiography procedure. (cheyenneregional.org)
This procedure is called magnetic resonance angiography (MRA). (medicinenet.com)
Aortic angiography is a procedure that uses a special dye and x-rays to see how blood flows through the aorta. (adam.com)

In a study comparing systematic (routine) coronary angiography with selective coronary angiography in patients undergoing surgical treatment of PAOD, Monaco et al found that routine angiography had a positive impact. (medscape.com)

Angiography uses x-rays and a special dye to see inside the arteries. (adam.com)

Incomplete stent apposition is detectable on 3T-MR angiography as a Crescent Sign and was found to be highly prevalent in Enterprise closed-cell design aneurysm stent-coiling and associated with peri-procedural ipsilateral diffusion-weighted hyper-intense lesions. (cns.org)
False positive diagnoses of cerebral aneurysm via magnetic resonance angiography (MRA) screening may increase unnecessary cerebral catheter angiography. (neurointervention.org)
Magnetic resonance angiography (MRA) is useful in assessing the aortic anatomy, the size of the aneurysm, the dissection, and the branch vessels. (medscape.com)

Thirty-six patients were studied to determine the visibility of the hepatic artery and portal vein with contrast-enhanced MR angiography. (semanticscholar.org)
A distinctive semi-lunar signal pattern was identified using 3T-MR angiography showing flow outside the confines of the stent-struts in Enterprise but not Neuroform stented patients. (cns.org)
The Centers for Medicare & Medicaid Services (CMS) today announced it intends to expand diagnostic options for certain Medicare beneficiaries by making Magnetic Resonance Angiography (MRA) available to patients with abdominal and pelvic vascular disease under certain clinical circumstances. (cms.gov)
Spiral computed tomography alone, a low probability ventilation perfusion lung scan, magnetic resonance angiography, a quantitative latex D-dimer test, and haemagglutination D-dimers had higher negative likelihood ratios and can therefore only exclude pulmonary embolism in patients with a low pretest probability. (bmj.com)
Use caution in moving patients who are potentially unstable to the angiography suite. (medscape.com)
METHODS: The CFA bifurcation level was identified in 100 patients, who underwent cerebral angiography or endovascular treatment by femoral artery (FA) puncture, on 191 sides. (bvsalud.org)
CONCLUSIONS: Approximately one-fourth of all patients undergoing cerebral angiography or endovascular treatment by FA puncture had high CFA bifurcation levels, which had a significant association with old age and history of diabetes. (bvsalud.org)

Unlike traditional angiography that involves placing a tube (catheter) into the body, MRA is noninvasive. (medlineplus.gov)

However, MRA is gaining ground on contrast angiography because of the latter test's possible complications. (cheyenneregional.org)

We searched Medline, Embase, and Pascal Biomed for studies published from January 1990 to September 2003 using the search terms ((pulmonary embol* or pulmonary thromboembol*) and (diagnosis or diagnostic) and (angiography or arteriography or (follow adj up) or followup or (management adj stud*)) and (PY = 1990-2003) and (study or studies or trial) and (LA = ENGLISH). (bmj.com)

Materials and methods: Histological analysis and in vivo magnetic resonance angiography protocols based on time of flight (TOF) and contrast-enhanced (CE) angiography were applied to evaluate cerebrovascular alterations. (archives-ouvertes.fr)

This can lead to long-chain fatty alcohol accumulation as demonstrated in the brain with proton magnetic resonance spectroscopy. (arizona.edu)

To date, no side effects from the magnetic fields and radio waves have been reported. (medlineplus.gov)

Contrast angiography is useful in assessing complex aortic pathology and identifying anatomy of branch vessels. (medscape.com)

Brain magnetic resonance angiography and electroencephalography revealed normal findings. (cdc.gov)
Machine Learning-Enabled Determination of Diffuseness of Brain Arteriovenous Malformations from Magnetic Resonance Angiography. (cdc.gov)

CBCT was initially developed for the use in angiography 24,27 . (bvsalud.org)

The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures. (liu.edu)
La técnica se utiliza especialmente en la ANGIOGRAFÍA CEREBRAL y para estudios de otras estructuras vasculares. (bvsalud.org)
Objective: Cerebral angiography is indispensable for endovascular neurosurgeons. (bvsalud.org)
Methods: Endovascular neurosurgeons scored the operators of 177 cerebral angiography based on ten evaluation items. (bvsalud.org)
Conclusions: There were significant differences in the total score between statuses, suggesting that the scoring system may be an indicator of proficiency in cerebral angiography. (bvsalud.org)

Magnetic resonance angiography (MRA) is an MRI exam of the blood vessels. (medlineplus.gov)
Hemifacial spasm (HFS), characterized by intermittent twitching of muscles supplied by one facial nerve is commonly due to compression of the facial nerve by blood vessel(s) adjacent to its root exit zone (REZ). (annals.edu.sg)
MRA has not yet supplanted contrast angiography, the standard test for evaluating blood vessels before determining treatment. (cheyenneregional.org)

Magnetic resonance angiography (MRA) - NECK is a topic covered in the Guide to Diagnostic Tests . (unboundmedicine.com)
Emergency Central , emergency.unboundmedicine.com/emergency/view/GDT/619429/all/Magnetic_resonance_angiography__MRA____NECK. (unboundmedicine.com)

The strong magnetic fields created during an MRI can cause heart pacemakers and other implants to not work as well. (medlineplus.gov)

Anatomy26

Diseases44

Chemicals and Drugs6

Analytical, Diagnostic and Therapeutic Techniques and Equipment65

Phenomena and Processes9

Information Science6

Health Care17

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

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

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

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

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

Pseudoaneurysm of the vertebral artery. (6/2878)

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

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

Magnetic Resonance Angiography

Magnetic Resonance Imaging

Angiography, Digital Subtraction

Contrast Media

Angiography

Cerebral Angiography

Imaging, Three-Dimensional

Gadolinium

Coronary Angiography

Gadolinium DTPA

Magnetic Resonance Spectroscopy

Sensitivity and Specificity

Image Enhancement

Circle of Willis

Tomography, X-Ray Computed

Ultrasonography, Doppler, Duplex

Carotid Stenosis

Intracranial Aneurysm

Carotid Artery, Internal

Arterial Occlusive Diseases

Cerebral Arterial Diseases

Constriction, Pathologic

Artifacts

Image Interpretation, Computer-Assisted

Renal Artery Obstruction

Vertebral Artery

Vertebrobasilar Insufficiency

Observer Variation

Predictive Value of Tests

Cerebral Arteries

Magnetic Resonance Imaging, Cine

Image Processing, Computer-Assisted

Reproducibility of Results

Anterior Cerebral Artery

Posterior Cerebral Artery

Organometallic Compounds

Meglumine

Prospective Studies

Intracranial Arteriovenous Malformations

Intracranial Arterial Diseases

Pulmonary Veins

Renal Artery

Endarterectomy, Carotid

Cerebrovascular Circulation

Preoperative Care

Carotid Arteries

Intracranial Arteriosclerosis

Ultrasonography, Doppler, Color

Collateral Circulation

Brain

Infarction, Posterior Cerebral Artery

Ultrasonography, Doppler, Transcranial

Retrospective Studies

Severity of Illness Index

Feasibility Studies

Tibial Arteries

Peripheral Vascular Diseases

Scimitar Syndrome

Coronary Vessels

Blood Flow Velocity

Aneurysm, Ruptured

Treatment Outcome

Vertebral Artery Dissection

Embolization, Therapeutic

Portography

Basilar Artery

Moyamoya Disease

Ultrasonography, Doppler

Vascular Malformations

Cerebrovascular Disorders

Carotid Artery Diseases

Fluorescein Angiography

Fibromuscular Dysplasia

Stents

Leg

Radiographic Image Enhancement

Diagnostic Imaging

Lateral Medullary Syndrome

Phlebography

Carotid Artery, External