Angiography: Radiography of blood vessels after injection of a contrast medium.Coronary Angiography: Radiography of the vascular system of the heart muscle after injection of a contrast medium.Magnetic Resonance Angiography: 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.Cerebral Angiography: Radiography of the vascular system of the brain after injection of a contrast medium.Angiography, Digital Subtraction: 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.Fluorescein Angiography: 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.Tomography, X-Ray Computed: Tomography using x-ray transmission and a computer algorithm to reconstruct the image.Contrast Media: Substances used to allow enhanced visualization of tissues.Radionuclide Angiography: 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.Intracranial Aneurysm: 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)Sensitivity and Specificity: 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)Coronary Artery Disease: Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.Coronary Stenosis: Narrowing or constriction of a coronary artery.Imaging, Three-Dimensional: 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.Tomography, Spiral Computed: 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.Embolization, Therapeutic: 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.Intracranial Arteriovenous Malformations: 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.Iopamidol: A non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiological procedures.Predictive Value of Tests: 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.Carotid Artery, Internal: Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose.Multidetector Computed Tomography: Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.Coronary Vessels: The veins and arteries of the HEART.Vertebral Artery: The first branch of the SUBCLAVIAN ARTERY with distribution to muscles of the NECK; VERTEBRAE; SPINAL CORD; CEREBELLUM; and interior of the CEREBRUM.Prospective Studies: 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.Coronary Disease: An imbalance between myocardial functional requirements and the capacity of the CORONARY VESSELS to supply sufficient blood flow. It is a form of MYOCARDIAL ISCHEMIA (insufficient blood supply to the heart muscle) caused by a decreased capacity of the coronary vessels.Iohexol: An effective non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiographic procedures. Its low systemic toxicity is the combined result of low chemotoxicity and low osmolality.Stents: Devices that provide support for tubular structures that are being anastomosed or for body cavities during skin grafting.Radiographic Image Interpretation, Computer-Assisted: Computer systems or networks designed to provide radiographic interpretive information.Arterial Occlusive Diseases: 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.Subarachnoid Hemorrhage: 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.Aneurysm, Ruptured: 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.Treatment Outcome: 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.Image Processing, Computer-Assisted: 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.Reproducibility of Results: 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.Retrospective Studies: 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.Indocyanine Green: A tricarbocyanine dye that is used diagnostically in liver function tests and to determine blood volume and cardiac output.Constriction, Pathologic: The condition of an anatomical structure's being constricted beyond normal dimensions.Central Nervous System Vascular Malformations: Congenital, inherited, or acquired abnormalities involving ARTERIES; VEINS; or venous sinuses in the BRAIN; SPINAL CORD; and MENINGES.Vertebrobasilar Insufficiency: 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.Observer Variation: 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).Carotid Stenosis: 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)Radiographic Image Enhancement: 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.Follow-Up Studies: 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.Arteriovenous Fistula: An abnormal direct communication between an artery and a vein without passing through the CAPILLARIES. An A-V fistula usually leads to the formation of a dilated sac-like connection, arteriovenous aneurysm. The locations and size of the shunts determine the degree of effects on the cardiovascular functions such as BLOOD PRESSURE and HEART RATE.Ultrasonography, Interventional: The use of ultrasound to guide minimally invasive surgical procedures such as needle ASPIRATION BIOPSY; DRAINAGE; etc. Its widest application is intravascular ultrasound imaging but it is useful also in urology and intra-abdominal conditions.Cerebral Arteries: The arterial blood vessels supplying the CEREBRUM.Cerebral Veins: Veins draining the cerebrum.Angioplasty, Balloon, Coronary: Dilation of an occluded coronary artery (or arteries) by means of a balloon catheter to restore myocardial blood supply.Myocardial Infarction: NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).Fundus Oculi: The concave interior of the eye, consisting of the retina, the choroid, the sclera, the optic disk, and blood vessels, seen by means of the ophthalmoscope. (Cline et al., Dictionary of Visual Science, 4th ed)Circle of Willis: 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.Feasibility Studies: Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.Arteriovenous Malformations: Abnormal formation of blood vessels that shunt arterial blood directly into veins without passing through the CAPILLARIES. They usually are crooked, dilated, and with thick vessel walls. A common type is the congenital arteriovenous fistula. The lack of blood flow and oxygen in the capillaries can lead to tissue damage in the affected areas.Severity of Illness Index: Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.Carotid Artery Diseases: 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.Collateral Circulation: Maintenance of blood flow to an organ despite obstruction of a principal vessel. Blood flow is maintained through small vessels.Triiodobenzoic Acids: Triiodo-substituted derivatives of BENZOIC ACID.Electrocardiography: Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.Magnetic Resonance Imaging: 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.Angina Pectoris: The symptom of paroxysmal pain consequent to MYOCARDIAL ISCHEMIA usually of distinctive character, location and radiation. It is thought to be provoked by a transient stressful situation during which the oxygen requirements of the MYOCARDIUM exceed that supplied by the CORONARY CIRCULATION.Aortography: Radiographic visualization of the aorta and its branches by injection of contrast media, using percutaneous puncture or catheterization procedures.Radiation Dosage: The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).Time Factors: Elements of limited time intervals, contributing to particular results or situations.Cardiac Catheterization: Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.Gadolinium DTPA: 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)Ultrasonography, Doppler, Duplex: 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.Image Enhancement: 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.Radiography, Interventional: Diagnostic and therapeutic procedures that are invasive or surgical in nature, and require the expertise of a specially trained radiologist. In general, they are more invasive than diagnostic imaging but less invasive than major surgery. They often involve catheterization, fluoroscopy, or computed tomography. Some examples include percutaneous transhepatic cholangiography, percutaneous transthoracic biopsy, balloon angioplasty, and arterial embolization.Vascular Patency: The degree to which BLOOD VESSELS are not blocked or obstructed.Chest Pain: Pressure, burning, or numbness in the chest.Carotid Arteries: 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.Tomography, Emission-Computed, Single-Photon: A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.Cineangiography: Motion pictures of the passage of contrast medium through blood vessels.Blood Flow Velocity: A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.Myocardial Perfusion Imaging: The creation and display of functional images showing where the blood is flowing into the MYOCARDIUM by following over time the distribution of tracers injected into the blood stream.Angiocardiography: Radiography of the heart and great vessels after injection of a contrast medium.Basilar Artery: 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.Coronary Circulation: The circulation of blood through the CORONARY VESSELS of the HEART.Fractional Flow Reserve, Myocardial: The ratio of maximum blood flow to the MYOCARDIUM with CORONARY STENOSIS present, to the maximum equivalent blood flow without stenosis. The measurement is commonly used to verify borderline stenosis of CORONARY ARTERIES.Cerebral Arterial Diseases: 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.Myocardial Revascularization: The restoration of blood supply to the myocardium. (From Dorland, 28th ed)Cardiac-Gated Imaging Techniques: Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.Coronary Vessel Anomalies: Malformations of CORONARY VESSELS, either arteries or veins. Included are anomalous origins of coronary arteries; ARTERIOVENOUS FISTULA; CORONARY ANEURYSM; MYOCARDIAL BRIDGING; and others.Pulmonary Embolism: Blocking of the PULMONARY ARTERY or one of its branches by an EMBOLUS.Renal Artery: A branch of the abdominal aorta which supplies the kidneys, adrenal glands and ureters.Artifacts: 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.Aneurysm: 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.Risk Factors: 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.Celiac Artery: The arterial trunk that arises from the abdominal aorta and after a short course divides into the left gastric, common hepatic and splenic arteries.Cranial Sinuses: Large endothelium-lined venous channels situated between the two layers of DURA MATER, the endosteal and the meningeal layers. They are devoid of valves and are parts of the venous system of dura mater. Major cranial sinuses include a postero-superior group (such as superior sagittal, inferior sagittal, straight, transverse, and occipital) and an antero-inferior group (such as cavernous, petrosal, and basilar plexus).Cerebrovascular Disorders: 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.Extravasation of Diagnostic and Therapeutic Materials: The escape of diagnostic or therapeutic material from the vessel into which it is introduced into the surrounding tissue or body cavity.Aneurysm, False: Not an aneurysm but a well-defined collection of blood and CONNECTIVE TISSUE outside the wall of a blood vessel or the heart. It is the containment of a ruptured blood vessel or heart, such as sealing a rupture of the left ventricle. False aneurysm is formed by organized THROMBUS and HEMATOMA in surrounding tissue.Injections, Intra-Arterial: Delivery of drugs into an artery.Coronary Artery Bypass: Surgical therapy of ischemic coronary artery disease achieved by grafting a section of saphenous vein, internal mammary artery, or other substitute between the aorta and the obstructed coronary artery distal to the obstructive lesion.Moyamoya Disease: 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.Recurrence: The return of a sign, symptom, or disease after a remission.Intracranial Arteriosclerosis: 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.Graft Occlusion, Vascular: Obstruction of flow in biological or prosthetic vascular grafts.Ultrasonography, Doppler, Color: 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.Coronary Aneurysm: Abnormal balloon- or sac-like dilatation in the wall of CORONARY VESSELS. Most coronary aneurysms are due to CORONARY ATHEROSCLEROSIS, and the rest are due to inflammatory diseases, such as KAWASAKI DISEASE.Gadolinium: 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.Renal Artery Obstruction: 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).Radial Artery: The direct continuation of the brachial trunk, originating at the bifurcation of the brachial artery opposite the neck of the radius. Its branches may be divided into three groups corresponding to the three regions in which the vessel is situated, the forearm, wrist, and hand.Iliac Artery: Either of two large arteries originating from the abdominal aorta; they supply blood to the pelvis, abdominal wall and legs.Vasospasm, Intracranial: Constriction of arteries in the SKULL due to sudden, sharp, and often persistent smooth muscle contraction in blood vessels. Intracranial vasospasm results in reduced vessel lumen caliber, restricted blood flow to the brain, and BRAIN ISCHEMIA that may lead to hypoxic-ischemic brain injury (HYPOXIA-ISCHEMIA, BRAIN).Image Interpretation, Computer-Assisted: Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.Calcinosis: Pathologic deposition of calcium salts in tissues.Coronary Restenosis: Recurrent narrowing or constriction of a coronary artery following surgical procedures performed to alleviate a prior obstruction.Exercise Test: Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.Preoperative Care: 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)Subtraction Technique: Combination or superimposition of two images for demonstrating differences between them (e.g., radiograph with contrast vs. one without, radionuclide images using different radionuclides, radiograph vs. radionuclide image) and in the preparation of audiovisual materials (e.g., offsetting identical images, coloring of vessels in angiograms).Choroid: The thin, highly vascular membrane covering most of the posterior of the eye between the RETINA and SCLERA.Angioplasty, Balloon: 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.Anterior Cerebral Artery: 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.Choroidal Neovascularization: A pathological process consisting of the formation of new blood vessels in the CHOROID.Cerebral Infarction: 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).Femoral Artery: The main artery of the thigh, a continuation of the external iliac artery.Phlebography: Radiographic visualization or recording of a vein after the injection of contrast medium.Ultrasonography, Doppler: 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)Aneurysm, Dissecting: 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.Gated Blood-Pool Imaging: Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchronizer or gating device. Analysis of right ventricular function is difficult with this technique; that is best evaluated by first-pass ventriculography (VENTRICULOGRAPHY, FIRST-PASS).Echocardiography: Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.Ischemic Attack, Transient: 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)Cerebrovascular Circulation: The circulation of blood through the BLOOD VESSELS of the BRAIN.Endarterectomy: 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.Cavernous Sinus: An irregularly shaped venous space in the dura mater at either side of the sphenoid bone.Ultrasonography, Doppler, Transcranial: 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.Catheterization: Use or insertion of a tubular device into a duct, blood vessel, hollow organ, or body cavity for injecting or withdrawing fluids for diagnostic or therapeutic purposes. It differs from INTUBATION in that the tube here is used to restore or maintain patency in obstructions.Surgical Instruments: Hand-held tools or implements used by health professionals for the performance of surgical tasks.Arteries: The vessels carrying blood away from the heart.Coronary Vasospasm: Spasm of the large- or medium-sized coronary arteries.Acute Disease: Disease having a short and relatively severe course.Technetium: The first artificially produced element and a radioactive fission product of URANIUM. Technetium has the atomic symbol Tc, atomic number 43, and atomic weight 98.91. All technetium isotopes are radioactive. Technetium 99m (m=metastable) which is the decay product of Molybdenum 99, has a half-life of about 6 hours and is used diagnostically as a radioactive imaging agent. Technetium 99 which is a decay product of technetium 99m, has a half-life of 210,000 years.Myocardial Ischemia: A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (CORONARY ARTERY DISEASE), to obstruction by a thrombus (CORONARY THROMBOSIS), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (MYOCARDIAL INFARCTION).Thrombolytic Therapy: Use of infusions of FIBRINOLYTIC AGENTS to destroy or dissolve thrombi in blood vessels or bypass grafts.Posterior Cerebral Artery: 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.Carotid Artery, External: Branch of the common carotid artery which supplies the exterior of the head, the face, and the greater part of the neck.Prognosis: 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.Postoperative Complications: 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.Risk Assessment: 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)Radiology, Interventional: Subspecialty of radiology that combines organ system radiography, catheter techniques and sectional imaging.Cerebral Revascularization: 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.Rupture, Spontaneous: Tear or break of an organ, vessel or other soft part of the body, occurring in the absence of external force.Peripheral Vascular Diseases: Pathological processes involving any one of the BLOOD VESSELS in the vasculature outside the HEART.Hematoma: A collection of blood outside the BLOOD VESSELS. Hematoma can be localized in an organ, space, or tissue.ROC Curve: 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.Vertebral Artery Dissection: 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.Pulmonary Artery: The short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.Retinal Vessels: The blood vessels which supply and drain the RETINA.Hepatic Artery: A branch of the celiac artery that distributes to the stomach, pancreas, duodenum, liver, gallbladder, and greater omentum.Brain Ischemia: 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.Ultrasonography: 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.Basal Ganglia Cerebrovascular Disease: A pathological condition caused by impaired blood flow in the basal regions of cerebral hemispheres (BASAL GANGLIA), such as INFARCTION; HEMORRHAGE; or ISCHEMIA in vessels of this brain region including the lateral lenticulostriate arteries. Primary clinical manifestations include involuntary movements (DYSKINESIAS) and muscle weakness (HEMIPARESIS).Tomography, Optical Coherence: An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes.Equipment Design: Methods of creating machines and devices.Myocardial Bridging: A malformation that is characterized by a muscle bridge over a segment of the CORONARY ARTERIES. Systolic contractions of the muscle bridge can lead to narrowing of coronary artery; coronary compression; MYOCARDIAL ISCHEMIA; MYOCARDIAL INFARCTION; and SUDDEN CARDIAC DEATH.Endarterectomy, Carotid: The excision of the thickened, atheromatous tunica intima of a carotid artery.Angina, Unstable: Precordial pain at rest, which may precede a MYOCARDIAL INFARCTION.Ischemia: 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.Blood Vessel Prosthesis Implantation: Surgical insertion of BLOOD VESSEL PROSTHESES to repair injured or diseased blood vessels.Choroid Diseases: Disorders of the choroid including hereditary choroidal diseases, neoplasms, and other abnormalities of the vascular layer of the uvea.Meglumine: 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.Vascular Surgical Procedures: Operative procedures for the treatment of vascular disorders.Cerebral Hemorrhage: Bleeding into one or both CEREBRAL HEMISPHERES including the BASAL GANGLIA and the CEREBRAL CORTEX. It is often associated with HYPERTENSION and CRANIOCEREBRAL TRAUMA.Coronary Occlusion: Complete blockage of blood flow through one of the CORONARY ARTERIES, usually from CORONARY ATHEROSCLEROSIS.Subclavian Artery: Artery arising from the brachiocephalic trunk on the right side and from the arch of the aorta on the left side. It distributes to the neck, thoracic wall, spinal cord, brain, meninges, and upper limb.Acute Coronary Syndrome: An episode of MYOCARDIAL ISCHEMIA that generally lasts longer than a transient anginal episode that ultimately may lead to MYOCARDIAL INFARCTION.Retinal DiseasesPlaque, Atherosclerotic: Lesions formed within the walls of ARTERIES.Takayasu Arteritis: 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.Aorta, Abdominal: The aorta from the DIAPHRAGM to the bifurcation into the right and left common iliac arteries.Vascular Malformations: 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.Diagnostic Imaging: 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.Percutaneous Coronary Intervention: A family of percutaneous techniques that are used to manage CORONARY OCCLUSION, including standard balloon angioplasty (PERCUTANEOUS TRANSLUMINAL CORONARY ANGIOPLASTY), the placement of intracoronary STENTS, and atheroablative technologies (e.g., ATHERECTOMY; ENDARTERECTOMY; THROMBECTOMY; PERCUTANEOUS TRANSLUMINAL LASER ANGIOPLASTY). PTCA was the dominant form of PCI, before the widespread use of stenting.Technetium Tc 99m Sestamibi: A technetium imaging agent used to reveal blood-starved cardiac tissue during a heart attack.Carotid-Cavernous Sinus Fistula: An acquired or spontaneous abnormality in which there is communication between CAVERNOUS SINUS, a venous structure, and the CAROTID ARTERIES. It is often associated with HEAD TRAUMA, specifically basilar skull fractures (SKULL FRACTURE, BASILAR). Clinical signs often include VISION DISORDERS and INTRACRANIAL HYPERTENSION.Stroke: 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)Fibromuscular Dysplasia: 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.Blood Vessel Prosthesis: Device constructed of either synthetic or biological material that is used for the repair of injured or diseased blood vessels.Mesenteric Artery, Superior: A large vessel supplying the whole length of the small intestine except the superior part of the duodenum. It also supplies the cecum and the ascending part of the colon and about half the transverse part of the colon. It arises from the anterior surface of the aorta below the celiac artery at the level of the first lumbar vertebra.Dura Mater: The outermost of the three MENINGES, a fibrous membrane of connective tissue that covers the brain and the spinal cord.Phantoms, Imaging: 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)Ioxaglic Acid: A low-osmolar, ionic contrast medium used in various radiographic procedures.Incidental Findings: 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.Chi-Square Distribution: A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.Thallium Radioisotopes: Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes.Intracranial Thrombosis: Formation or presence of a blood clot (THROMBUS) in a blood vessel within the SKULL. Intracranial thrombosis can lead to thrombotic occlusions and BRAIN INFARCTION. The majority of the thrombotic occlusions are associated with ATHEROSCLEROSIS.Regional Blood Flow: The flow of BLOOD through or around an organ or region of the body.Perfusion Imaging: The creation and display of functional images showing where the blood flow reaches by following the distribution of tracers injected into the blood stream.Patient Selection: 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.Intracranial Embolism and Thrombosis: Embolism or thrombosis involving blood vessels which supply intracranial structures. Emboli may originate from extracranial or intracranial sources. Thrombosis may occur in arterial or venous structures.Vascular Diseases: Pathological processes involving any of the BLOOD VESSELS in the cardiac or peripheral circulation. They include diseases of ARTERIES; VEINS; and rest of the vasculature system in the body.Fluoroscopy: Production of an image when x-rays strike a fluorescent screen.Organometallic Compounds: 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)Gastrointestinal Hemorrhage: Bleeding in any segment of the GASTROINTESTINAL TRACT from ESOPHAGUS to RECTUM.Cardiology Service, Hospital: The hospital department responsible for the administration and provision of diagnostic and therapeutic services for the cardiac patient.Coloring Agents: Chemicals and substances that impart color including soluble dyes and insoluble pigments. They are used in INKS; PAINTS; and as INDICATORS AND REAGENTS.Fibrinolytic Agents: Fibrinolysin or agents that convert plasminogen to FIBRINOLYSIN.Angioplasty: Reconstruction or repair of a blood vessel, which includes the widening of a pathological narrowing of an artery or vein by the removal of atheromatous plaque material and/or the endothelial lining as well, or by dilatation (BALLOON ANGIOPLASTY) to compress an ATHEROMA. Except for ENDARTERECTOMY, usually these procedures are performed via catheterization as minimally invasive ENDOVASCULAR PROCEDURES.Coronary Thrombosis: Coagulation of blood in any of the CORONARY VESSELS. The presence of a blood clot (THROMBUS) often leads to MYOCARDIAL INFARCTION.

Using vascular structure for CT-SPECT registration in the pelvis. (1/2636)

The authors outline a method for three-dimensional registration of pelvic CT and 111In-labeled monoclonal antibody capromab pendetide (111In MoAb 7E11.C5) images using 99mTc-labeled red blood cell SPECT data. METHODS: This method of CT-SPECT registration relies on the identification of major blood vessels in the CT and 99mTc SPECT images. The vessels are segmented from the image datasets by outlining them on transverse planar slices using a mouse-based drawing tool. Stacking the transverse outlines provides a three-dimensional representation of the vascular structures. Registration is performed by matching the surfaces of the segmented volumes. Dual isotope acquisition of 111In and 99mTc activities provides precise SPECT-SPECT registration so that registration in three dimensions of the 111In MoAb and CT images is achieved by applying the same transformation obtained from the 99mTc SPECT-CT registration. RESULTS: This method provided accurate registration of pelvic structures and significantly improved interpretation of 111In MoAb 7E11.C5 exams. Furthermore, sites of involvement by prostate cancer suggested by the 111In MoAb examination could be interpreted with the bony and soft tissue (nodal) anatomy seen on CT. CONCLUSION: This method is a general clinical tool for the registration of pelvic CT and SPECT imaging data. There are immediate applications in conformal radiation therapy treatment planning for certain prostate cancer patients.  (+info)

Disease pattern in cranial and large-vessel giant cell arteritis. (2/2636)

OBJECTIVE: To identify variables that distinguish large-vessel giant cell arteritis (GCA) with subclavian/axillary/brachial artery involvement from cranial GCA. METHODS: Seventy-four case patients with subclavian/axillary GCA diagnosed by angiography and 74 control patients with temporal artery biopsy-proven GCA without large vessel involvement matched for the date of first diagnosis were identified. Pertinent initial symptoms, time delay until diagnosis, and clinical symptoms, as well as clinical and laboratory findings at the time of diagnosis, were recorded by retrospective chart review. Expression of cytokine messenger RNA in temporal artery tissue from patients with large-vessel and cranial GCA was determined by semiquantitative polymerase chain reaction analysis. Distribution of disease-associated HLA-DRB1 alleles in patients with aortic arch syndrome and cranial GCA was assessed. RESULTS: The clinical presentation distinguished patients with large-vessel GCA from those with classic cranial GCA. Upper extremity vascular insufficiency dominated the clinical presentation of patients with large-vessel GCA, whereas symptoms related to impaired cranial blood flow were infrequent. Temporal artery biopsy findings were negative in 42% of patients with large-vessel GCA. Polymyalgia rheumatica occurred with similar frequency in both patient groups. Large-vessel GCA was associated with higher concentrations of interleukin-2 gene transcripts in arterial tissue and overrepresentation of the HLA-DRB1*0404 allele, indicating differences in pathogenetic mechanisms. CONCLUSION: GCA is not a single entity but includes several variants of disease. Large-vessel GCA produces a distinct spectrum of clinical manifestations and often occurs without involvement of the cranial arteries. Large-vessel GCA requires a different approach to the diagnosis and probably also to treatment.  (+info)

3D angiography. Clinical interest. First applications in interventional neuroradiology. (3/2636)

3D angiography is a true technical revolution that allows improvement in the quality and safety of diagnostic and endovascular treatment procedures. 3D angiography images are obtained by reconstruction of a rotational angiography acquisition done on a C-arm (GE Medical Systems) spinning at 40 degrees per second. The carotid or vertebral selective injection of a total of 15 ml of non-ionic contrast media at 3 ml/sec over 5 seconds allows the selection of the "arterial phase". Four hundred sixty 3D angiographic studies were performed from December 1996 to September 1998 on 260 patients and have been analyzed in MIP (Maximum Intensity Projection) and SSD (Shaded Surface Display) views. The exploration of intracranial aneurysms is simplified and only requires, for each vascular axis, a biplane PA and Lateral run followed by a single rotational angiography run. The 3D angiography image is available on the workstation's screen (Advantage Workstation 3.1, GE Medical Systems) in less than 10 minutes after the acquisition of the rotational run. It therefore allows one to analyze, during the intervention, the aneurysm's angioarchitecture, in particular the neck, and select the best therapeutic technique. When endovascular treatment is the best indication, 3D angiography allows one to define the optimal angle of view and accurately select the microcoils dimensions. 3D angiography replaces the multiple oblique views that used to be required to analyze the complex aneurysms and therefore allows a reduction of the total contrast medium quantity, the patient X-ray dose and the length of the intervention time which is a safety factor. Also, in particular for complex cases, it brings additional elements complementing the results of standard 2D DSA and rotational angiograms. In the cervical vascular pathology, 3D angiography allows for a better assessment of the stenosis level and of dissection lesions. Our current research activities focus on the matching without stereotactic frame between 3D X-ray angiography and volumetric MR acquisition, which should allow us to improve the treatment of intracerebral arterio-venous malformations (AVMs).  (+info)

Prevalence of angiographic atherosclerotic renal artery disease and its relationship to the anatomical extent of peripheral vascular atherosclerosis. (4/2636)

BACKGROUND: Recognition of the possible presence of atherosclerotic renal artery disease (ARAD) is important because of its progressive nature, and because of the potential for precipitating an acute deterioration in renal function by administration of angiotensin-converting enzyme inhibitors. The aim of this study was to identify the prevalence of ARAD in patients undergoing peripheral angiography and its relationship to the extent of their peripheral vascular disease (PVD). METHODS: The reports of the 218 patients who underwent peripheral angiography to investigate PVD in one centre in a calendar year, and in whom it was possible to image the renal arteries, were analysed retrospectively. The presence of atherosclerotic disease in the renal, aortic, iliac, femoral and distal areas was recorded for each patient. RESULTS: The prevalence of ARAD was 79/218 (36.2%). The greater the number of atherosclerotic areas of the arterial tree, the higher the prevalence of ARAD. Patients with aortic disease and bilateral iliac, femoral and distal vessel disease had the highest incidence of ARAD 19/38 (50%). The incidence of ARAD in those with femoral artery atherosclerosis was significantly higher than in those without femoral artery atherosclerosis (42.1% compared with 9.7%, P=0.001 chi2). There was no significant difference in those groups with or without iliac and distal disease. None of the 11 patients with normal femoral and iliac arteries had ARAD. CONCLUSIONS: Renal artery atherosclerosis is a common occurrence in patients with PVD. If extensive PVD is recognized during aortography, a high flush should be considered to examine the renal arteries, if they are not included in the main study.  (+info)

Medullary thyroid carcinoma with multiple hepatic metastases: treatment with transcatheter arterial embolization and percutaneous ethanol injection. (5/2636)

A 54-year-old man with medullary thyroid carcinoma in the thyroid gland was unable to undergo total thyroidectomy because the tumor had invaded the mediastinum. Radiation therapy and chemotherapy were given. Seven years later, intractable diarrhea and abdominal pain appeared, and computed tomography demonstrated hypervascular tumors in the thyroid gland and in the liver. The tumors were successfully treated with percutaneous ethanol injection to a lesion in the thyroid gland and transcatheter arterial embolization followed by percutaneous ethanol injection to tumors in the liver. Transcatheter arterial embolization and percutaneous ethanol injection may be valuable in treating medullary thyroid carcinoma.  (+info)

Late massive haemoptyses from bronchopulmonary collaterals in infarcted segments following pulmonary embolism. (6/2636)

Massive, recurrent haemoptyses requiring blood transfusions occurred in a patient who had been diagnosed as having pulmonary thromboembolism 3 months earlier. To the authors' knowledge this is the first case report of this kind, in which massive haemoptyses were proved to be caused by large bronchopulmonary collaterals that had developed in the infarcted lung segments affected by embolism. Selective embolization of the collaterals proved to be therapeutic and life saving.  (+info)

Plaque area increase and vascular remodeling contribute to lumen area change after percutaneous transluminal angioplasty of the femoropopliteal artery: an intravascular ultrasound study. (7/2636)

OBJECTIVE: The aim of the study was to assess the change in lumen area (LA), plaque area (PLA), and vessel area (VA) after percutaneous transluminal angioplasty (PTA) of the femoropopliteal artery. METHODS: This was a prospective study. Twenty patients were studied with intravascular ultrasound (IVUS) immediately after PTA and at follow-up examination. Multiple corresponding IVUS cross-sections were analyzed at the segments that were dilated by PTA (ie, treated sites; n = 168), including the most stenotic site (n = 20) and the nondilated segments (ie, reference sites; n = 77). RESULTS: At follow-up examination, both the PLA increase (13%) and the VA decrease (9%) resulted in a significant LA decrease (43%) at the most stenotic sites (P =.001). At the treated sites, the LA decrease (15%) was smaller and was caused by the PLA increase (15%). At the reference sites, the PLA increase (15%) and the VA increase (6%) resulted in a slight LA decrease (3%). An analysis of the IVUS cross-sections that were grouped according to LA change (difference >/=10%) revealed a similar PLA increase in all the groups: the type of vascular remodeling (VA decrease, no change, or increase) determined the LA change. At the treated sites, the LA change and the VA change correlated closely (r = 0.77, P <.001). At the treated sites, significantly more PLA increase was seen in the IVUS cross-sections that showed hard lesion or media rupture (P <.05). No relationship was found between the presence of dissection and the quantitative changes. CONCLUSION: At the most stenotic sites, lumen narrowing was caused by plaque increase and vessel shrinkage. Both the treated sites and the reference sites showed a significant PLA increase: the type of vascular remodeling determined the LA change at follow-up examination. The extent of the PLA increase was significantly larger in the IVUS cross-sections that showed hard lesion or media rupture.  (+info)

Immunohistochemical analysis of arterial wall cellular infiltration in Buerger's disease (endarteritis obliterans). (8/2636)

PURPOSE: The diagnosis of Buerger's disease has depended on clinical symptoms and angiographic findings, whereas pathologic findings are considered to be of secondary importance. Arteries from patients with Buerger's tissue were analyzed histologically, including immunophenotyping of the infiltrating cells, to elucidate the nature of Buerger's disease as a vasculitis. METHODS: Thirty-three specimens from nine patients, in whom Buerger's disease was diagnosed on the basis of our clinical and angiographic criteria between 1980 and 1995 at Nagoya University Hospital, were studied. Immunohistochemical studies were performed on paraffin-embedded tissue with a labeled streptoavidin-biotin method. RESULTS: The general architecture of vessel walls was well preserved regardless of the stage of disease, and cell infiltration was observed mainly in the thrombus and the intima. Among infiltrating cells, CD3(+) T cells greatly outnumbered CD20(+) B cells. CD68(+) macrophages or S-100(+) dendritic cells were detected, especially in the intima during acute and subacute stages. All cases except one showed infiltration by the human leukocyte antigen-D region (HLA-DR) antigen-bearing macrophages and dendritic cells in the intima. Immunoglobulins G, A, and M (IgG, IgA, IgM) and complement factors 3d and 4c (C3d, C4c) were deposited along the internal elastic lamina. CONCLUSION: Buerger's disease is strictly an endarteritis that is introduced by T-cell mediated cellular immunity and by B-cell mediated humoral immunity associated with activation of macrophages or dendritic cells in the intima.  (+info)

Information for patients Mesenteric Angiography Sheffield Vascular Institute Northern General Hospital You have been given this leaflet because you need a procedure known as a Mesenteric Angiogram. This
Books by Marianne R. Tortorici, Concepts in medical radiographic imaging, Advanced radiographic and angiographic procedures with an introduction to specialized imaging, Advanced Radiographic And Angiographic Procedures, Radiation Physics Laboratory Manual, Fundamentals of angiography
Conventional angiography is the diagnostic standard for determining the presence, location and severity of heart disease. An EB, CT, EBT Angiography are different forms of angiographies that offers similar results if a convetional angiography is not necessary. Find an angiography clinic facility in your area.
Difference between angiogram and arteriogram - Almost the same. An angiogram is generic meaning, a study of blood vessels, but is typically used almost synonymously with arteriogram. A venogram is when you inject dye to study veins (veins carry blood back to your heart) An arteriogram is when you inject arteries the blood vessels that carry blood from your heart to various body parts.
TY - JOUR. T1 - Diagnostic angiography in tumours of the neck. AU - Balogh, A.. AU - Szlavy, L.. AU - Sulyok, Z.. AU - Tóth, L.. AU - Besznyák, I.. PY - 1982/12/1. Y1 - 1982/12/1. UR - http://www.scopus.com/inward/record.url?scp=0020424623&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0020424623&partnerID=8YFLogxK. M3 - Article. C2 - 7180331. AN - SCOPUS:0020424623. VL - 23. SP - 1. EP - 7. JO - Acta Chirurgica Academiae Scientiarum Hungaricae. JF - Acta Chirurgica Academiae Scientiarum Hungaricae. SN - 0001-5431. IS - 1. ER - ...
A method of performing angiography of the occular fundus of an eye of a patient includes the steps of injecting intravenously calcein into the patient in an effective amount immediately prior to angiography and performing angiography on the patient. The invention further discloses a method of performing photocoagulation therapy and/or photodynamic therapy and angiography of the ocular fundus of an eye of a patient which includes the steps of performing photocoagulation therapy, injecting intravenously calcein into the patient in an effective amount immediately prior to angiography, and performing angiography on the patient.
Can renal PTA (percutaneous transluminal angioplasty) be reported in conjunction with renal stent placement? Is preceding diagnostic angiography additionally re
Memorial Medical Center (Springfield, IL) Medical Imaging Services Arteriogram. During an arteriogram, contrast (dye) is injected into arteries to assess blood supply and arterial patency (openness).
The operation known as angio by people is carried out for diagnosis (angiography) and for treatment. Angiography means the imaging of the veins and arteries. A drug called contrast substance that makes the veins visible is administered into the veins and films called angiograms are obtained. Thanks to angiography, the veins fostering the organs are imaged and diagnostic information regarding vascular diseases or the organs fostered by those veins are obtained. The classical method for the treatment of angio is angioplasty. It is carried out in order to reopen the narrowed or blocked veins through a special devices called balloon or stent.. In the light of that information, since nothing related to eating and drinking take place in both angiography or angioplasty, fasting is not invalidated. ...
Radifocus Glidecath is a hydrophilic angiographic catheter intended for use in angiographic procedures in peripheral and neural vasculature. It delivers radiopa
Om Eye & Heart care offers Angiography in Pune in Viman Nagar, Vishrantwadi, Pune. Best Angiography Specialist in Pune. Angiography Cost in Pune.
Quality Cardiovascuoar&Angiography products from Cardiovascuoar&Angiography manufacturer - china Cardiovascuoar&Angiography exporters mjn.
The detailed process of an arteriogram procedure depends on the part of the body involved, according to Healthline. The procedure generally consists of the doctor inserting a tube in a vein that is...
Eating has become quite a pastime for many people around the world. While eating lots of fatty foods can be fun, it can also lead to a myriad of different health problems. Over time, the fat can start to build up in the arteries, in turn causing high cholesterol, high blood pressure, and a significant risk for a heart attack or a stroke.
Eating has become quite a pastime for many people around the world. While eating lots of fatty foods can be fun, it can also lead to a myriad of different health problems. Over time, the fat can start to build up in the arteries, in turn causing high cholesterol, high blood pressure, and a significant risk for a heart attack or a stroke.
CT angiography combines a CT scan with the injection of dye. This technique is able to create pictures of the blood vessels in your belly or pelvis area.
Best options for [Angiography Of Neck MRA Scan] cost in [ Thoothukudi] and across India at certified labs. Compare [Angiography Of Neck MRA Scan] prices Get Discount.
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Childrens Specialized Hospital Mountainside procedure pricing information for a X-Ray of Artery - Head and Neck (Angiography) can be found listed below. Find a cost comparison to other providers in New York, NY and see your potential savings.
Unionsquare Medical Imaging procedure pricing information for a X-Ray of Artery - Head and Neck (Angiography) can be found listed below. Find a cost comparison to other providers in New York, NY and see your potential savings.
OCT angiography (AngioPlex OCT Angiography) is now available as an upgrade to the CIRRUS 5000 HD-OCT platform (Carl Zeiss Meditec). The technology allows visualization of the blood flow and microvasculature in the retina, choriocapillaris, and choroid with the ease of noninvasive imaging. ...
Saturday, August 25, 2007 , Labels: angiography, lab test , This entry was posted on Saturday, August 25, 2007 and is filed under angiography , lab test . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site. ...
Saturday, August 25, 2007 , Labels: angiography, lab test , This entry was posted on Saturday, August 25, 2007 and is filed under angiography , lab test . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site. ...
Browse from thousands of Angiography questions and answers (Q&A). Become a part of our community of millions and ask any question that you do not find in our Angiography Q&A library.
Angiography News. Find breaking news, commentary, and archival information about Angiography From The tribunedigital-baltimoresun
Oak Brook, Ill. (PRWEB) February 19, 2013 -- Coronary computed tomography angiography (CCTA) is an effective tool for determining the risk of heart attacks and
TimCT Angiography employs the revolutionary TimCT Continuous Table move technology for large Field of View angiographies with the smoothest workflow and the most homogeneous image quality.
Angiography. View from the control room of medical staff performing an angiogram of the blood vessels around a patients heart. Angiograms use a radio-opaque contrast medium injected into the blood vessels and multiple X-rays, taken from different angles around the patients body. This shows the structure and size of the blood vessels and allows doctors to spot any narrowing or damage to them. Photographed in Nice, France. - Stock Image C010/3718
An abdominal angiogram checks the blood vessels of the stomach and assesses the flow of blood to the organs like the spleen and liver. Learn on procedure, reason and risks.
... is a test that uses an injection of a liquid dye to make the arteries easily visible on X-rays. Find out when it is used.
Siemens Healthcare has integrated the navigation technology MediGuide from St. Jude Medical into its Artis zee™ angiography systems. The technology i
Get optimal interventional Angiography solutions for all your needs from electrophysiology to innovative hybrid surgical interventions
Get optimal interventional Angiography solutions for all your needs from electrophysiology to innovative hybrid surgical interventions
The OCT Angiography Module non-invasively produces detailed three dimensional illustrations of the retinal and choroidal microvasculature.
Primary Medical Centre Corrimal provides angiography to monitor the health of circulatory systems and examine body parts. Contact us to learn more today!
Learn more about Angiography at Sky Ridge Medical Center DefinitionReasons for ProcedurePossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
Sanador has invested EUR 1 million in an angiography equipment that was installed in a laboratory within its hospital. Up to now, over 200 investigations
New Cardio treatment method of angiography which directly removes block. Only at the cost of Rs.5000 at J. J. HOSPITAL. MUMBAI. ... Please help someone.. Who waiting for it. very effective 4 in 1 ...
Angiography is an X-ray imaging technique in which, contrasting agents are injected into the blood stream to visualize the blood vessels and help understan
Angiography clinics in Al Zahiyah at the best price. Find doctors, specialized in Vascular Medicine and compare prices, costs and reviews.
Angiography Injectors market report added by qyresearchgroups.com. In this Report includes best market price, trends, Growth, Forecast, Analysis, demand & Overview.
It is important with corneal angiography to remember that every patient is different so your technique might very slightly from patient to patient.
It is important with corneal angiography to remember that every patient is different so your technique might very slightly from patient to patient.
We offer a standard pack configuration as well as the ability to customize pieces to meet your individual needs within your procedures
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Сайт Государственного автономного учреждения здравоохранения Межрегиональный клинико-диагностический центр (ГАУЗ МКДЦ), расположенного в РТ, г.Казань, ул. Карбышева д.12а.
TY - JOUR. T1 - Helical CT pulmonary angiography for acute pulmonary embolism. AU - Gotway, Michael B.. AU - Yee, Judy. PY - 2002/1/1. Y1 - 2002/1/1. UR - http://www.scopus.com/inward/record.url?scp=0036224846&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0036224846&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:0036224846. VL - 31. SP - 21. EP - 30. JO - Applied Radiology. JF - Applied Radiology. SN - 0160-9963. IS - 4. ER - ...
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Pulmonary embolism (PE) is a blockage of the main pulmonary artery or one of its branches by a substance that has travelled from elsewhere in the body through the bloodstream (embolism). Pulmonary embolism (PE) is the third most common cause of cardiovascular related mortality. Numerous diagnostic tools have been utilized in order to improve diagnosis and prompt appropriate treatment. Since the first introduction of Computed Tomography (CT) angiography in the setting of PE diagnosis algorithm, it has rapidly become as the first choice among imaging techniques. However, still there is long way to improve the abilities and lowering the possible hazards and problems. The purpose of this review is to evaluate and summarize the role of imaging tools in diagnosis of PE in suspected patients, with particular focus on CT angiography. We studied different areas related benefits, disagreements and challenges in utilizing CT angiography in the setting of PE diagnosis algorithm. Although CT angiography is still
Main article: Computed tomography angiography. Computed tomography angiography (CTA) is contrast CT to visualize arterial and ... Angiography[edit]. Example of a CTPA, demonstrating a saddle embolus (dark horizontal line) occluding the pulmonary arteries ( ... Coronary CT angiography (CTA): the use of CT to assess the coronary arteries of the heart. The subject receives an intravenous ... CT angiography avoids the invasive insertion of a catheter. CT colonography (also known as virtual colonoscopy or VC for short ...
... and CT angiography (visualizing blood vessels with radiocontrast on a CT scan) to identify aneurysms. Catheter angiography also ... Angiography[edit]. After a subarachnoid hemorrhage is confirmed, its origin needs to be determined. If the bleeding is likely ... Aneurysms of the middle cerebral artery and its related vessels are hard to reach with angiography and tend to be amenable to ... If a cerebral aneurysm is identified on angiography, two measures are available to reduce the risk of further bleeding from the ...
Angiography[edit]. Angiography is the X-ray imaging of blood vessels which is done by injecting contrast agents into the ... "Angiography - Consumer Information - InsideRadiology". InsideRadiology. 23 September 2016. Archived from the original on 22 ...
Angiography[edit]. As the cause of the ischemia can be due to embolic or thrombotic occlusion of the mesenteric vessels or ... Geoffrey D. Rubin (2012). CT and MR Angiography: Comprehensive Vascular Assessment. Lippincott Williams & Wilkins. p. 318. ISBN ... Though it has serious risks, angiography provides the possibility of direct infusion of vasodilators in the setting of ... The best method of diagnosis is angiography, with computer tomography (CT) being used when that is not available.[1] ...
Angiography using X-rays or magnetic resonance angiography are methods to visualize blood vessels. The term "anatomy" is ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Medicine. "Angiography". National Health Service. Retrieved 29 April 2014 ... Gribble N, Reynolds K (1993). "Use of Angiography to Outline the Cardiovascular Anatomy of the Sand Crab Portunus pelagicus ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Society for Cardiovascular Angiography and, Interventions; Society of Interventional, Radiology; Society for Vascular, Medicine ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
Non-enhanced MR angiography: State-of-the-Art. Radiology, 2008:248(1):20-43. "Vivian S. Lee, MD, PhD, MBA", University of Utah ... Lee, Vivian; Miyazaki M (2008). "Nonenhanced MR Angiography". Radiology. 248: 20-43. doi:10.1148/radiol.2481071497. Retrieved ...
Diagnostic cerebral angiography. Philadelphia: Lippincott Willims & Wilkins. pp. 84-87. ISBN 0-397-58404-0. ...
X-ray angiography). In fact, clinical trials are underway in the fields of vascular surgery and interventional radiology. Non- ...
... and angiography rooms. Institute of Rheumatology and Orthopaedics - 60 bed unit covering diagnosis; orthopaedic theatre suite; ...
"Coronary Angiography". National Heart, Blood, and Lung Institute. Retrieved 10 December 2017.. ... The Stockholm Female Coronary Angiography Study". J. Intern. Med. 261 (3): 245-54. doi:10.1111/j.1365-2796.2006.01759.x. PMID ... Electrocardiogram, cardiac stress test, coronary computed tomographic angiography, coronary angiogram[8]. Prevention. Healthy ... stress testing or angiography may be used to identify and treat coronary artery disease in patients who have had an NSTEMI or ...
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 ...
Computed Tomography (CT) angiography". Pelviperineology.org. 2007-12-04. Retrieved 2012-10-23. Moore, Keith (2007). Essential ...
"Angiography - Siemens Healthineers Global". Healthcare.siemens.com. Retrieved 2017-11-07. "Fluoroscopy Equipment - Siemens ... Angiography, Fluoroscopy etc. AXIOM Aristos AXIOM Artis AXIOM Iconos AXIOM Luminos dRF AXIOM Multix AXIOM Sensis Ysio ...
Magnetic resonance angiography (MRA) generates pictures of the arteries to evaluate them for stenosis (abnormal narrowing) or ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 2017-10-15. Dr J. Ray Ballinger; et al. "Phase ... known as phase contrast angiography) can also be used to generate flow velocity maps easily and accurately. Magnetic resonance ... solutions containing 13C or stabilized bubbles of hyperpolarized 129Xe have been studied as contrast agents for angiography and ...
Lopid Coronary Angiography Trial". Atherosclerosis. 139 (1): 49-56. doi:10.1016/S0021-9150(98)00053-7. PMID 9699891. de Maat MP ...
"Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 2017-10-15. Dr J. Ray Ballinger; et al. "Phase ...
Magnetic resonance angiography (MRA) is a group of techniques based to image blood vessels. Magnetic resonance angiography is ... The most common use of this technique is for suppression of background signal in time of flight MR angiography. There are also ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Hospital. Retrieved 2017-10-15. Dr J. Ray Ballinger; et al. "Phase ... ISBN 0-521-68384-X. Wheaton AJ; Miyazaki M (2012). "Non-contrast enhanced MR angiography: physical principles". J Magn Reson ...
Value of selective angiography]". Journal de médecine de Lyon. 52 (192): 1523-6 passim. PMID 5503857. King SM, Dillman JF, ...
... and the reference method is catheter angiography. Coronary computed tomography angiography (c-CTA) is more valuable in the ... Keywords: Computed tomography angiography, coronary artery, anomaly. Ali Mahir G nd z. Coronary Artery Anomalies and Variations ... Coronary Artery Anomalies and Variations Detected in Computed Tomography Angiography. Ali Mahir G nd z. Department of Radiology ... There are studies indicating that c-CTA is superior to catheter angiography in the diagnosis of coronary artery anomalies. ...
Angiography is a type of X-ray used to examine the blood vessels. Find out why its used, what it involves and what the ... coronary angiography - to check the heart and nearby blood vessels *cerebral angiography - to check the blood vessels in and ... Read more about what happens before, during and after angiography.. Risks of an angiogram. Angiography is generally a safe and ... renal angiography - to check the blood vessels supplying the kidneys Occasionally angiography may be carried out using scans ...
... cerebral angiography was one of the most common diagnostic procedures in diagnostic radiology. With the advent of CT and MRI in ... The maturing of CT and MRI with the widespread use of MR and CT angiography has further encroached on the use of angiography in ... Vertebral Artery Cerebral Angiography Common Femoral Artery Cerebral Angiogram Femoral Artery Puncture These keywords were ... Before the widespread use of cross-sectional imaging, cerebral angiography was one of the most common diagnostic procedures in ...
The history of cerebral angiography is discussed, extending from the first human angiogram in 1927 to the present time.... ... This chapter covers the essential aspects of diagnostic cerebral angiography. ... This chapter covers the essential aspects of diagnostic cerebral angiography. The history of cerebral angiography is discussed ... Vertebral Artery Radial Artery Brachial Artery Intracranial Aneurysm Cerebral Angiography These keywords were added by machine ...
... is a test that uses an injection of a liquid dye to make the arteries easily visible on X-rays. Find out when it is ... What is angiography?. Angiography is a test that uses an injection of a liquid dye to make the arteries easily visible on X- ... Angiography. Angiography is a test that uses an injection of a liquid dye to make the arteries easily visible on X-rays. Find ... There is a small risk of angiography damaging blood vessels because it passes them. So, in heart (coronary) angiography, it is ...
... coronary Coronary angiography is an X-ray of the heart and blood vessels of a living patient. The X-ray is taken with a moving ... Angiography, Coronary Medical Discoveries COPYRIGHT 1997 Thomson Gale. Angiography, coronary. Coronary angiography is an X-ray ... coronary angiography (ko-rŏn-er-i) n. see angiography. Cite this article Pick a style below, and copy the text for your ... coronary angiography A Dictionary of Nursing © A Dictionary of Nursing 2008, originally published by Oxford University Press ...
... (FFA). This is a special test used for examination of blood vessels in the eye. It is an office ... Fluorescein Angiography may be done when any retinal disease, especially that involving the blood vessels is suspected, like ...
Extremity angiography is a test used to see the arteries in the hands, arms, feet, or legs. It is also called peripheral ... It is also called peripheral angiography. Angiography uses x-rays and a special dye to see inside the arteries. Arteries are ... Angiography of the extremity; Peripheral angiography; Lower extremity angiogram; Peripheral angiogram; Arteriography of the ... Angiography: principles, techniques and complications. In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. Grainger & ...
Aortic angiography is a procedure that uses a special dye and x-rays to see how blood flows through the aorta. The aorta is the ... Aortic angiography has been mostly replaced by computed tomography (CT) angiography or magnetic resonance (MR) angiography. ... Aortic angiography is a procedure that uses a special dye and x-rays to see how blood flows through the aorta. The aorta is the ... Angiography uses x-rays and a special dye to see inside the arteries. Arteries are blood vessels that carry blood away from the ...
The angiography catheter can be of the so-called pigtail type, with a circular curvature through substantially 360 , wherein ... The invention relates to an angiography catheter comprising a hose-like body with at least one lumen debouching at the distal ... In all angiography catheters with a curved end, openings can be arranged according to the invention in the wall of the ... 4. The angiography catheter as claimed in 2, wherein said openings arranged in the curvature of said distal end portion are ...
Interventional X-ray coronary angiography is a primary tool to guide catheter-based coronary interventions. High-quality images ... Committee on Coronary Angiography). Developed in collaboration with the Society for Cardiac Angiography and Interventions. J Am ... ACC/AHA guidelines for coronary angiography. A report of the American College of Cardiology/American Heart Association Task ... Interventional X-ray coronary angiography is a primary tool to guide catheter-based coronary interventions. High-quality images ...
Angiography is a procedure used to create an image of blood vessels, including those of the head, kidneys, heart or lungs. A ... Angiography may also be called arteriography.. Why angiography is done. Angiography may be done to see how the blood flows ... Angiography. Angiography is a procedure used to make pictures of blood vessels, including those of the head, kidneys, heart, ... How catheter-angiography is done. Angiography may be done in the hospital or a specialized medical imaging centre. You usually ...
... Stephen G. Schwartz,1 Harry W. Flynn Jr.,1 Andrzej Grzybowski,2,3 Avinash Pathengay,4 ...
CT coronary angiography (CTCA) is a highly effective first-line investigation in those patients assessed to be at low- ... CT coronary angiography (CTCA) outperformed exercise tolerance testing (ETT) for each of the comparative measures described ... We compared two cohorts of patients pre-and post introduction of CT coronary angiography (CTCA) in our hospital presenting with ... NICE guideline 95 proposes using CT coronary angiography (CTCA) in patients at low predicted risk of coronary artery disease ...
PRWEB) February 19, 2013 -- Coronary computed tomography angiography (CCTA) is an effective tool for determining the risk of ... Coronary computed tomography angiography (CCTA) is an effective tool for determining the risk of heart attacks and other ... Coronary computed tomography angiography (CCTA) is an effective tool for determining the risk of heart attacks and other ... They culled the data from the Coronary CT Angiography Evaluation For Clinical Outcomes: An International Multicenter (CONFIRM) ...
... is a procedure that uses a special dye (contrast material) and x-rays to see how blood flows through the ... Cardiac angiography; Angiography - heart; Angiogram - coronary; Coronary artery disease - angiography; CAD - angiography; ... Angina - angiography; Heart disease - angiography. How the Test is Performed. Coronary angiography is often done along with ... Coronary angiography is a procedure that uses a special dye (contrast material) and x-rays to see how blood flows through the ...
Because no contrast is given, it is a good alternative to CT angiography for patients that cant tolerate CT contrast ( ...
The present invention relates to a catheter for angiography adapted to be used simultaneously with a catheter introducing guide ... Method of angiography. US5484424 *. 16. Nov. 1993. 16. Jan. 1996. Celsa L.G. (Societe Anonyme). Blood filtering device having a ... DSA (Digital Subtraction Angiography) and other angiographic tests based on computer images are being used for diagnosis of ... 3. A catheter for angiography as set forth in claim 1, wherein the front end portion (10b) of the catheter (10) has a greater ...
CORONARY ANGIOGRAPHY venothini My mother has small pain in below chest and back of chest, then doctor advise to go for an ... CORONARY ANGIOGRAPHY. My mother has small pain in below chest and back of chest, then doctor advise to go for an angiogram, ...
Angiography within anterior imaging. December 01, 2017By Lisa Stewart. It is important with corneal angiography to remember ... OCT angiography (AngioPlex OCT Angiography) is now available as an upgrade to the CIRRUS 5000 HD-OCT platform (Carl Zeiss ... Angiography debuts as latest upgrade to high-definition OCT platform. October 15, 2015By Cheryl Guttman Krader ... Studying aqueous humour outflow with aqueous angiography. July 10, 2017By Caroline Richards ...
Coronary angiography (an-jee-OG-ra-fee) is a test that uses dye and special x rays to show the inside of your coronary arteries ... Coronary angiography shows if you have CAD. Most of the time, the coronary arteries cant be seen on an x ray. During coronary ... angiography, a special dye is injected into the bloodstream to make the coronary arteries show up on an x ray. ... Retrieved from "http://www.conservapedia.com/index.php?title=Coronary_angiography&oldid=1304469" ...
Coronary Angiography. Its Role in the Management of the Patient with Angina Pectoris. HAROLD A. BALTAXE, DAVID C. LEVIN ... The history, technic, and complications of coronary angiography have been discussed. Myocardial infarction caused by the ...
Angiography. What is angiography?. Angiography -- also called arteriogram or angiogram -- is an x-ray of blood vessels that ... Health services and information : Health services : For Adults A-Z : Imaging : Angiography ...
coronary angiography Also called coronary angiogram, coronary angiography is an X-ray test to diagnose diseases of the arteries ... Coronary angiography can detect weakened blood vessel walls and narrowed or blocked vessels. X-rays are taken after a special ...
... is a procedure to look at the left-sided heart chambers and the function of the left-sided ... Left heart ventricular angiography is a procedure to look at the left-sided heart chambers and the function of the left-sided ... Angiography - left heart; Left ventriculography. How the Test is Performed. Before the test, you will be given medicine to help ... Left heart ventricular angiography has some risk because it is an invasive procedure. Other imaging techniques may carry less ...
  • In just a few seconds, OCT angiography (OCTA) takes a single, non-invasive scan of the retina to produce a high-resolution view of the separate layers of the retina and its blood vessels. (prweb.com)
  • Herein, we discuss the utility of OCT angiography, which has very recently shown promise to detect microvasculature changes in the retina in neurodegenerative diseases, as well as the current limitations of OCTA technology as a diagnostic tool in these diseases. (healio.com)
  • With known angiography catheters of this type, the curvature can deform quite considerably during injection of the contrast liquid as a result of the reaction forces of the contrast liquid flowing in the curvature and spurting outward from the end opening. (google.com)
  • Because no contrast is given, it is a good alternative to CT angiography for patients that can't tolerate CT contrast (iodinated contrast. (cedars-sinai.edu)
  • The program addresses the fundamental concerns associated with conventional angiography, which requires the injection of a contrast agent directely into the coronary arteries by the mean of arterial cathetherization. (esrf.eu)
  • Patients with kidney disease or injury may suffer further kidney damage from the contrast mediums used for angiography. (encyclopedia.com)
  • Angiography requires the injection of a contrast dye that makes the blood vessels visible to x ray. (encyclopedia.com)
  • The improved safety of spinal angiography can be explained by the use of non-ionic contrast dyes, heparin flushes, and selective catheterization, according to the authors. (medpagetoday.com)
  • Contraindications to computed tomographic angiography (CTA) include renal disease, severe allergy to iodine contrast, inability to follow breath-hold instructions, and pregnancy. (ahajournals.org)
  • Angiography is a minimally invasive medical test that uses x-rays and an iodine-containing contrast material to produce pictures of blood vessels in the brain. (radiologyinfo.org)
  • The dye injected to perform CT angiography is called a contrast material because it "lights up" blood vessels and tissues that are being studied. (hopkinsmedicine.org)
  • Angiography contrast material can damage your kidneys, so you may not be able to have this test if you have severe kidney disease or diabetes . (hopkinsmedicine.org)
  • We characterized image quality in optical coherence angiography (OCA) en face planes of mouse cortical capillary network in terms of signal-to-noise ratio (SNR) and Weber contrast (Wc) through a novel mask-based segmentation method. (nih.gov)
  • In all cases, angiography requires that intravenous contrast is administered. (imaginis.com)
  • During angiography, physicians inject streams of contrast agents or dyes into the area of interest using catheters to create detailed images of the blood vessels in real time. (imaginis.com)
  • An article from the heart center in Leipzig suggests that intraoperative 3D imaging with rotational angiography is much more precise and can be performed with low contrast and low radiation dose if combined with diluted contrast injection and rapid ventricular pacing. (wikipedia.org)
  • By contrast, the spatial resolution of flat-panel volume CT (rotational angiography using a C-Arm) can be much better than that of a multislice CT scanner, with resolution ranges between 200 and 300 μm in high-resolution mode, compared to up to 600μm for a multislice CT. (wikipedia.org)
  • Contrast resolution, measured in hounsfield units (HU), is only marginally inferior than with a multidetector CT, the difference in attenuation from the background being 5 HU with flat-panel volume CT (=rotational angiography) compared to 3 HU for a multidetector CT. (wikipedia.org)
  • In traditional angiography images are acquired by exposing an area of interst with time-controlled x-rays while injecting contrast medium into the blood vessels. (bionity.com)
  • There are no evaluations for CT Angiography with contrast. (patientslikeme.com)
  • Computed tomography angiography (CTA) is a specialized x-ray that examines blood flow in blood vessels when they are filled with a contrast material. (stdavids.com)
  • To make it possible to do angiography and surgery on the same day and largely diminish the possibility of renal failure, Mayo physicians use other contrast agents. (eurekalert.org)
  • A number of diagnostic imaging techniques exist, including computed tomography angiography (CTA) and contrast-enhanced magnetic resonance angiography (CEMRA), to aid in PAD diagnosis and subsequent treatment planning. (mdpi.com)
  • The programme addresses the fundamental concerns associated with conventional angiography, which requires the injection of a contrast agent directly into the coronary arteries by means of arterial catheterisation. (esrf.eu)
  • This study was undertaken to analyze presentation and outcome and to assess the role of angiography in diagnosis and management of this complication. (nih.gov)
  • Even in challenging cases, CT angiography (CTA) offers an accurate and rapid diagnosis for blunt trauma victims who may have aortic or great vessel injury negating the need for more invasive procedures, according to a recent study conducted by radiologists at the University of Washington and the Harborview Injury Prevention and Research Center in Seattle, WA. (eurekalert.org)
  • If aortic injury is not diagnosed quickly, morbidity and mortality are significantly increased," CT angiography offers a much more rapid diagnosis than traditional catheter aortography, and it is noninvasive. (eurekalert.org)
  • Interventional radiologists also use angiography to place catheters directly into tumors (allowing direct injection of chemotherapy into the tumor), and for cutting off blood flow to fibroids and aneurysms. (ucsd.edu)
  • Arterial hemorrhage complicating pancreatic pseudocysts: role of angiography. (nih.gov)
  • Rotational angiography is a medical imaging technique based on x-ray, that allows to acquire CT-like 3D volumes during hybrid surgery or during a catheter intervention using a fixed C-Arm. (wikipedia.org)
  • Synonyms for rotational angiography include flat-panel volume CT and cone-beam CT. (wikipedia.org)
  • Choosing between CT and rotational angiography depends on several factors. (wikipedia.org)
  • Changes in anatomy: During endovascular procedures, such as the grafting of an aortic aneurysm, 3D planning can be done either on CT image acquired preoperatively or on an intraoperative 3D image acquired by rotational angiography. (wikipedia.org)
  • Image quality can differ between rotational angiography and CT images. (wikipedia.org)
  • There are alternatives nowadays to angiography, such as CT scan , MRI scans , nuclear scans, and ultrasound scans , which often produce information as accurate and useful as angiograms. (netdoctor.co.uk)
  • Haughton VM, Rosenbaum AE, Baker RA, Plaistowe RL (1975) Lateral projections with inclined head for angiography of basal cerebral aneurysms. (springer.com)