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.
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).
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.
Radiography of the vascular system of the brain after injection of a contrast medium.
Radiography of blood vessels after injection of a contrast medium.
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)
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
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.
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.
Substances used to allow enhanced visualization of tissues.
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.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
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.
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)
Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
The 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.
Congenital, inherited, or acquired abnormalities involving ARTERIES; VEINS; or venous sinuses in the BRAIN; SPINAL CORD; and MENINGES.
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.
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)
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.
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.
Veins draining the cerebrum.
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.
Calculi occurring in a salivary gland. Most salivary gland calculi occur in the submandibular gland, but can also occur in the parotid gland and in the sublingual and minor salivary glands.
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.
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.
A non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiological procedures.
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.
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).
The condition of an anatomical structure's being constricted beyond normal dimensions.
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.
Computer systems or networks designed to provide radiographic interpretive information.
A rapid, low-dose, digital imaging system using a small intraoral sensor instead of radiographic film, an intensifying screen, and a charge-coupled device. It presents the possibility of reduced patient exposure and minimal distortion, although resolution and latitude are inferior to standard dental radiography. A receiver is placed in the mouth, routing signals to a computer which images the signals on a screen or in print. It includes digitizing from x-ray film or any other detector. (From MEDLINE abstracts; personal communication from Dr. Charles Berthold, NIDR)
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.
The arterial blood vessels supplying the CEREBRUM.
Localized or diffuse reduction in blood flow through the vertebrobasilar arterial system, which supplies the BRAIN STEM; CEREBELLUM; OCCIPITAL LOBE; medial TEMPORAL LOBE; and THALAMUS. Characteristic clinical features include SYNCOPE; lightheadedness; visual disturbances; and VERTIGO. BRAIN STEM INFARCTIONS or other BRAIN INFARCTION may be associated.
Screens which absorb the energy in the x-ray beam that has penetrated the patient and convert this energy into a light pattern which has as nearly as possible the same information as the original x-ray beam. The more light a screen produces for a given input of x-radiation, the less x-ray exposure and thus shorter exposure time are needed to expose the film. In most film-screen systems, the film is sandwiched between two screens in a cassette so that the emulsion on each side is exposed to the light from its contiguous screen.
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.
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.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
A 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)
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.
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.
Triiodo-substituted derivatives of BENZOIC ACID.
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.
The first branch of the SUBCLAVIAN ARTERY with distribution to muscles of the NECK; VERTEBRAE; SPINAL CORD; CEREBELLUM; and interior of the CEREBRUM.
The anterior and posterior arteries created at the bifurcation of the popliteal artery. The anterior tibial artery begins at the lower border of the popliteus muscle and lies along the tibia at the distal part of the leg to surface superficially anterior to the ankle joint. Its branches are distributed throughout the leg, ankle, and foot. The posterior tibial artery begins at the lower border of the popliteus muscle, lies behind the tibia in the lower part of its course, and is found situated between the medial malleolus and the medial process of the calcaneal tuberosity. Its branches are distributed throughout the leg and foot.
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.
Hand-held tools or implements used by health professionals for the performance of surgical tasks.
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.
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).
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).
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.
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.
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.
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.
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.
Delivery of drugs into an artery.
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.
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.
Radiography of the SALIVARY GLANDS or ducts following injection of contrast medium.
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.
X-ray visualization of the spinal cord following injection of contrast medium into the spinal arachnoid space.
The circulation of blood through the BLOOD VESSELS of the BRAIN.
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.
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.
A branch of the abdominal aorta which supplies the kidneys, adrenal glands and ureters.
A radiopaque medium used for urography, angiography, venography, and myelography. It is highly viscous and binds to plasma proteins.
Either of the two principal arteries on both sides of the neck that supply blood to the head and neck; each divides into two branches, the internal carotid artery and the external carotid artery.
Vascular diseases characterized by thickening and hardening of the walls of ARTERIES inside the SKULL. There are three subtypes: (1) atherosclerosis with fatty deposits in the ARTERIAL INTIMA; (2) Monckeberg's sclerosis with calcium deposits in the media and (3) arteriolosclerosis involving the small caliber arteries. Clinical signs include HEADACHE; CONFUSION; transient blindness (AMAUROSIS FUGAX); speech impairment; and HEMIPARESIS.
Surgery performed on the nervous system or its parts.
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).
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.
Technique involving the passage of X-rays through oral structures to create a film record while a central tab or wing of dental X-ray film is being held between upper and lower teeth.
Branch of the common carotid artery which supplies the exterior of the head, the face, and the greater part of the neck.
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.
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.
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.
The degree to which BLOOD VESSELS are not blocked or obstructed.
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)
Devices that provide support for tubular structures that are being anastomosed or for body cavities during skin grafting.
Maintenance of blood flow to an organ despite obstruction of a principal vessel. Blood flow is maintained through small vessels.
Radiographic visualization of the aorta and its branches by injection of contrast media, using percutaneous puncture or catheterization procedures.
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.
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.
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.
INFLAMMATION of salivary tissue (SALIVARY GLANDS), usually due to INFECTION or injuries.
Endosseous dental implantation where implants are fitted with an abutment or where an implant with a transmucosal coronal portion is used immediately (within 1 week) after the initial extraction. Conventionally, the implantation is performed in two stages with more than two months in between the stages.
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)
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)
Elements of limited time intervals, contributing to particular results or situations.
The continuation of the femoral artery coursing through the popliteal fossa; it divides into the anterior and posterior tibial arteries.
Discharge of cerebrospinal fluid through the nose. Common etiologies include trauma, neoplasms, and prior surgery, although the condition may occur spontaneously. (Otolaryngol Head Neck Surg 1997 Apr;116(4):442-9)
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.
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.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
The arterial trunk that arises from the abdominal aorta and after a short course divides into the left gastric, common hepatic and splenic arteries.
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)
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).
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
An irregularly shaped venous space in the dura mater at either side of the sphenoid bone.
Production of an image when x-rays strike a fluorescent screen.
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)
Methods of creating machines and devices.
The main artery of the thigh, a continuation of the external iliac artery.
A method of producing a high-quality scan by digitizing and subtracting the images produced by high- and low-energy x-rays.
Narrowing or constriction of a coronary artery.
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.
Either of two large arteries originating from the abdominal aorta; they supply blood to the pelvis, abdominal wall and legs.
Negative test results in subjects who possess the attribute for which the test is conducted. The labeling of diseased persons as healthy when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
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).
The vessels carrying blood away from the heart.
Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)
Pathological processes involving any one of the BLOOD VESSELS in the vasculature outside the HEART.
A method in which either the observer(s) or the subject(s) is kept ignorant of the group to which the subjects are assigned.
The largest of the cerebral arteries. It trifurcates into temporal, frontal, and parietal branches supplying blood to most of the parenchyma of these lobes in the CEREBRAL CORTEX. These are the areas involved in motor, sensory, and speech activities.
Operative procedures for the treatment of vascular disorders.
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.
The flow of BLOOD through or around an organ or region of the body.
Libraries in which a major proportion of the resources are available in machine-readable format, rather than on paper or MICROFORM.
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.
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.
The excision of the thickened, atheromatous tunica intima of a carotid artery.
The evaluation of incidents involving the loss of function of a device. These evaluations are used for a variety of purposes such as to determine the failure rates, the causes of failures, costs of failures, and the reliability and maintainability of devices.
Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.
Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.
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.
The return of a sign, symptom, or disease after a remission.
Device constructed of either synthetic or biological material that is used for the repair of injured or diseased blood vessels.
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.
The inferior part of the lower extremity between the KNEE and the ANKLE.
Motion of an object in which either one or more points on a line are fixed. It is also the motion of a particle about a fixed point. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A tricarbocyanine dye that is used diagnostically in liver function tests and to determine blood volume and cardiac output.
Bleeding into one or both CEREBRAL HEMISPHERES including the BASAL GANGLIA and the CEREBRAL CORTEX. It is often associated with HYPERTENSION and CRANIOCEREBRAL TRAUMA.
Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.
A 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.
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.
Method of making images on a sensitized surface by exposure to light or other radiant energy.
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
Information systems, usually computer-assisted, designed to store, manipulate, and retrieve information for planning, organizing, directing, and controlling administrative activities associated with the provision and utilization of radiology services and facilities.
Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.
The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph.
The region of the lower limb in animals, extending from the gluteal region to the FOOT, and including the BUTTOCKS; HIP; and LEG.
The veins and arteries of the HEART.
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)
A gamma-emitting radionuclide imaging agent used for the diagnosis of diseases in many tissues, particularly in the gastrointestinal system, cardiovascular and cerebral circulation, brain, thyroid, and joints.
A large collection of DNA fragments cloned (CLONING, MOLECULAR) from a given organism, tissue, organ, or cell type. It may contain complete genomic sequences (GENOMIC LIBRARY) or complementary DNA sequences, the latter being formed from messenger RNA and lacking intron sequences.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
X-ray visualization of the chest and organs of the thoracic cavity. It is not restricted to visualization of the lungs.
The short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.
Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.
The two principal arteries supplying the structures of the head and neck. They ascend in the neck, one on each side, and at the level of the upper border of the thyroid cartilage, each divides into two branches, the external (CAROTID ARTERY, EXTERNAL) and internal (CAROTID ARTERY, INTERNAL) carotid arteries.
A film base coated with an emulsion designed for use with x-rays.
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.
A heavy, bluish white metal, atomic number 81, atomic weight [204.382; 204.385], symbol Tl.
Thickening and loss of elasticity of the walls of ARTERIES of all sizes. There are many forms classified by the types of lesions and arteries involved, such as ATHEROSCLEROSIS with fatty lesions in the ARTERIAL INTIMA of medium and large muscular arteries.
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)
Disease having a short and relatively severe course.
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.
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.
Transmission and interpretation of tissue specimens via remote telecommunication, generally for the purpose of diagnosis or consultation but may also be used for continuing education.

Combined carotid endarterectomy and coronary artery bypass graft. (1/1139)

Atherosclerosis is a generalized disease which afflicts a considerable number of patients in both the carotid and coronary arteries. Although the risk of stroke or death use to combined carotid endarterectomy (CEA) and coronary artery bypass graft (CABG) is thought to be higher than that of each individual operation, the combined procedure is generally preferred over staged operations to treat such patients. We performed the combined procedure safely with the aid of intraoperative portable digital subtraction angiography (DSA). This report describes our experience with the operative strategy of simultaneous CEA and CABG. Ninety CEA and 404 CABG were carried out between January 1989 and December 1997. A total of six patients received the combined procedure with the aid of intraoperative DSA; they were studied retrospectively. Postoperative mortality and morbidity after the combined procedure was 0%. In the combined procedure, neurological complications are difficult to detect after CEA because the patient must be maintained under general anesthesia and extracorporeal circulation during the subsequent CABG. However, intraoperative DSA can confirm patency of the internal carotid artery and absence of flap formation after CEA, and the CABG can be performed safely. Intraoperative portable DSA between CEA and CABG is helpful in preventing perioperative stroke in the combined procedure.  (+info)

Popliteal artery occlusion as a late complication of liquid acrylate embolization for cerebral vascular malformation. (2/1139)

Occlusion of arteriovenous malformations of the brain (BAVMs) by means of an endovascular approach with liquid acrylate glue is an established treatment modality. The specific hazards of this procedure are related to the central nervous system. In the case of unexpectedly rapid polymerization of the cyanoacrylate glue and adhesion of the delivering microcatheter to the BAVM, severing the catheter at the site of vascular access is considered an acceptable and safe management. We present a unique complication related to this technique that has not been described yet. Fragmentation and migration of the microcatheter, originally left in place, had caused popliteal artery occlusion, which required saphenous vein interposition, in a 25-year-old man. Suggestions for avoiding this complication are discussed.  (+info)

Factors influencing the development of vein-graft stenosis and their significance for clinical management. (3/1139)

OBJECTIVES: To assess the influence of clinical and graft factors on the development of stenotic lesions. In addition the implications of any significant correlation for duplex surveillance schedules or surgical bypass techniques was examined. PATIENTS AND METHODS: In a prospective three centre study, preoperative and peroperative data on 300 infrainguinal autologous vein grafts was analysed. All grafts were monitored by a strict duplex surveillance program and all received an angiogram in the first postoperative year. A revision was only performed if there was evidence of a stenosis of 70% diameter reduction or greater on the angiogram. RESULTS: The minimum graft diameter was the only factor correlated significantly with the development of a significant graft stenosis (PSV-ratio > or = 2.5) during follow-up (p = 0.002). Factors that correlated with the development of event-causing graft stenosis, associated with revision or occlusion, were minimal graft diameter (p = 0.001), the use of a venovenous anastomosis (p = 0.005) and length of the graft (p = 0.025). Multivariate regression analysis revealed that the minimal graft diameter was the only independent factor that significantly correlated with an event-causing graft stenosis (p = 0.009). The stenosis-free rates for grafts with a minimal diameter < 3.5 mm, between 3.5-4.5 and > or = 4.5 mm were 40%, 58% and 75%, respectively (p = < 0.05). Composite vein and arm-vein grafts with minimal diameters > or = 3.5 mm were compared with grafts which consisted of a single uninterrupted greater saphenous vein with a minimal diameter of < 3.5 mm. One-year secondary patency rates in these categories were of 94% and 76%, respectively (p = 0.03). CONCLUSIONS: A minimal graft diameter < 3.5 mm was the only factor that significantly correlated with the development of a graft-stenosis. However, veins with larger diameters may still develop stenotic lesions. Composite vein and arm-vein grafts should be used rather than uninterrupted small caliber saphenous veins.  (+info)

Bilateral vertebral artery occlusion following cervical spine trauma--case report. (4/1139)

A 41-year-old female presented with a rare case of bilateral vertebral artery occlusion following C5-6 cervical spine subluxation after a fall of 30 feet. Digital subtraction angiography showed occlusion of the bilateral vertebral arteries. Unlocking of the facet joint, posterior wiring with iliac crest grafting, and anterior fusion were performed. The patient died on the 3rd day after the operation. This type of injury has a grim prognosis with less than a third of the patients achieving a good outcome.  (+info)

Evaluation of cerebral aneurysms with high-resolution MR angiography using a section-interpolation technique: correlation with digital subtraction angiography. (5/1139)

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

Twinkling artifact on intracerebral color Doppler sonography. (6/1139)

Transcranial Doppler sonography shows potential as a noninvasive technique for long-term follow-up of treated intracranial saccular aneurysms. This technical note describes a color Doppler artifact related to microcoil architecture that might represent a potential pitfall in transcranial Doppler sonographic evaluation of aneurysmal cavity thrombosis, since it may be wrongly interpreted as residual flow or aneurysmal cavity recanalization.  (+info)

Cerebral veins: comparative study of CT venography with intraarterial digital subtraction angiography. (7/1139)

BACKGROUND AND PURPOSE: Our objective was to compare the reliability of CT venography with intraarterial digital subtraction angiography (DSA) in imaging cerebral venous anatomy and pathology. METHODS: In 25 consecutive patients, 426 venous structures were determined as present, partially present, or absent by three observers evaluating CT multiplanar reformatted (MPR) and maximum intensity projection (MIP) images. These results were compared with the results from intraarterial DSA and, in a second step, with the results of an intraobserver consensus. In addition, pathologic conditions were described. RESULTS: Using DSA as the standard of reference, MPR images had an overall sensitivity of 95% (specificity, 19%) and MIP images a sensitivity of 80% (specificity, 44%) in depicting the cerebral venous anatomy. On the basis of an intraobserver consensus including DSA, MPR, and MIP images (415 vessels present), the sensitivity/specificity was 95%/91% for MPR, 90%/100% for DSA, and 79%/91% for MIP images. MPR images were superior to DSA images in showing the cavernous sinus, the inferior sagittal sinus, and the basal vein of Rosenthal. Venous occlusive diseases were correctly recognized on both MPR and MIP images. Only DSA images provided reliable information of invasion of a sinus by an adjacent meningioma. CONCLUSION: CT venography proved to be a reliable method to depict the cerebral venous structures. MPR images were superior to MIP images.  (+info)

A persistent pharyngohyostapedial artery: embryologic implications. (8/1139)

A 3-year-old child was examined because of otorrhagia. CT scans showed an unusual vessel, confirmed by angiography, related to a persistent pharyngohyostapedial artery. This embryonic persistent artery associated with the normal internal carotid artery would explain the "duplication" aspect of the internal carotid artery.  (+info)

Comparisons between digital subtraction angiography and conventional angiography have frequently been made in the radiologic literature, and the high quality and several advantages of the former have been reported. In this study, 101 patients with intracranial aneurysms were examined only by intraarterial digital subtraction angiography; no conventional angiography was used. High-quality images were consistently obtained, facilitating an accurate and definitive diagnosis of intracranial aneurysm. Magnification radiography and stereography using intraarterial digital subtraction angiography were done to obtain a more precise diagnosis. Five small intracranial aneurysms with diameters of 1.0 to 2.0 mm could be detected. The procedure was considered to be as reliable and as safe as conventional angiography, used previously. Important advantages of intraarterial digital subtraction angiography include reduced procedural time and decreased contrast agent burden, factors that will ensure broader ...
TY - JOUR. T1 - Intra-arterial digital subtraction angiography through the ear artery for experimental aneurysm imaging. AU - Ding, Y. H.. AU - Dai, D.. AU - Danielson, M. A.. AU - Kadirvel, R.. AU - Lewis, D. A.. AU - Cloft, H. J.. AU - Kallmes, David F.. PY - 2006/9/1. Y1 - 2006/9/1. N2 - Digital subtraction angiography through the central artery of the ear was performed to show elastase-induced aneurysms in 34 rabbits. Twenty-eight (82%) aneurysms in which common origins of the bilateral common carotid artery (CCA) were found were well shown. All 6 other aneurysms not well shown had separate origins of the CCAs from the aortic arch (P , .001). This method can be used for angiographic follow-up when there is a common origin of the CCAs.. AB - Digital subtraction angiography through the central artery of the ear was performed to show elastase-induced aneurysms in 34 rabbits. Twenty-eight (82%) aneurysms in which common origins of the bilateral common carotid artery (CCA) were found were well ...
RESULTS. There were 27 patients (14 male, 13 female) with a mean age of 62 (range, 44-77) years. There were 10 patients with renal transplants; their native renal arteries were not evaluated. Each of the two experienced interventional and body magnetic resonance radiologists, who were blinded to the results, reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. Digital subtraction angiography was used as the standard of reference. A total of 39 renal arteries from these 27 patients were evaluated. One of the arteries was previously stented and could not be assessed with magnetic resonance angiography due to severe artefacts. Of the remaining 38 renal arteries, two were graded as normal, seven as having mild stenosis (=50% but =75%). Magnetic resonance angiography and digital subtraction angiography were concordant in 89% of the arteries; magnetic resonance angiography overestimated the degree of stenosis in 8% and underestimated it in 3% of them. In ...
TY - GEN. T1 - VIDEO REQUIREMENTS FOR DIGITAL SUBTRACTION ANGIOGRAPHY.. AU - Hines, Horace H.. AU - Seibert, J Anthony. AU - Borger, David J.. PY - 1984. Y1 - 1984. N2 - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video camera for optimized DSA studies include sufficient bandpass to satisfy digitization matrix sizes, an 800:1 camera SNR, progressive read out of the camera target, and bias light to minimize build-up lag response.. AB - The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. Various factors including spatial resolution, signal to noise ratio (SNR), progressive and interlaced read out, exposure utilization and camera lag are investigated. Requirements for the video ...
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A dynamic MR angiography technique, MR digital subtraction angiography (MR DSA), is proposed using fast acquisition, contrast enhancement, and complex subtraction. When a bolus of contrast is injected into a patient, data acquisition begins, dynamically acquiring a thick slab using a fast gradient e …
Time-resolved three-dimensional digital subtraction angiography (4D-DSA) can be used to quantify blood velocity. Contrast pulsatility, a major discriminant on 4D-DSA, is yet to be optimized. We investigated the effects of different imaging and injection parameters on sideband ratio (SBR), a measure of contrast pulsatile strength, within the hepatic vasculature of an in vivo porcine model. Fifty-nine hepatic 4D-DSA procedures were performed in three female domestic swine (mean weight 54 kg). Contrast injections were performed in the common hepatic artery with different combinations of imaging duration (6 s or 12 s), injection rates (from 1.0 to 2.5 mL/s), contrast concentration (50% or 100%), and catheter size (4 Fr or 5 Fr). Reflux was recorded. SBR and vessel cross-sectional areas were calculated in 289 arterial segments. Multiple linear mixed-effects models were estimated to determine the effects of parameters on SBR and cross-sectional vessel area. Twelve-second acquisitions yielded a SBR higher than
In many preliminary and feasibility studies, various contrast-enhanced MR angiorgaphic techniques have been implemented in the assessment of extracranial disease of the carotid artery. Different strategies are used to optimize image quality, including time-resolved and high-resolution techniques. Most of these reports, although based on small numbers of patients, suggest that contrast-enhanced MR angiography could become a diagnostic alternative as a fast, first screening method in patients suspected of having carotid artery disease, independently from the technique employed in the study.. DSA is still considered to be the criterion standard for imaging of arteriosclerotic supraaortic vessel disease. Harboring the risks of thromboembolic events, this technique can reduce the overall benefit of endarterectomy. Noninvasive techniques for imaging supraaortic vessels prevent this risk related to the diagnostic procedure and can be regarded as a safe alternative to DSA whenever possible.. We chose to ...
TY - JOUR. T1 - Advanced digital subtraction angiography and MR fusion imaging protocol applied to accurate placement of flow diverter device. AU - Faragò, Giuseppe. AU - Caldiera, Valentina. AU - Tempra, Giovanni. AU - Ciceri, Elisa. PY - 2016/2/1. Y1 - 2016/2/1. N2 - In recent years there has been a progressive increase in interventional neuroradiology procedures, partially due to improvements in devices, but also to the simultaneous development of technologies and radiological images. Cone beam CT (Dyna-CT; Siemens) is a method recently used to obtain pseudo CT images from digital subtraction angiography (DSA) with a flat panel detector. Using dedicated software, it is then possible to merge Dyna-CT images with images from a different source. We report here the usefulness of advanced DSA techniques (Syngo- Dyna CT, three-dimensional DSA iPilot) for the treatment of an intracranial aneurysm with a flow diverter device. Merging MR and Dyna-CT images at the end of the procedure proved to be a ...
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Typical digital subtraction angiography (DSA) acquisition rates are often inadequate for visualizing and analyzing fast-moving flow patterns. Therefore, an interpolation method that captures the angiographic flow pattern was developed. The temporal change of gray value in each pixel along a blood vessel records the flow movement at that location. Thus, temporal interpolation was performed on a pixel-by-pixel basis. To generate each interpolated image, a polynomial interpolation was applied to six sequential images. To validate the interpolation technique, a flow phantom was imaged with a high acquisition frame rate, and interpolation was done in a lower frame rate and compared to the acquired data. The interpolated images were also compared to results from linear interpolation and cubic spline interpolation. Clinical utility was illustrated on DSA images of cerebral vasculature with aneurysms. Image sequences of 60 frame/s were generated from DSA images acquired at 7.5 frame/s. The results show ...
BACKGROUND: Magnetic resonance (MR)-guided vascular interventions are of increasing interest, and, with the use of contrast-enhanced techniques, intraarterial contrast-enhanced MR angiography (ia-ce-MRA) competes with intraarterial digital subtraction angiography (ia-DSA) for the diagnostic evaluation of the infrainguinal vessel tree. PURPOSE: To assess the diagnostic value of ia-ce-MRA and high-resolution T1-weighted (hr-T1w) imaging compared to the gold-standard ia-DSA for residual stenosis and local dissections after femoropopliteal recanalization in patients with peripheral arterial occlusive disease (PAOD). MATERIAL AND METHODS: Eight patients with PAOD and short vessel occlusion of their femoropopliteal arteries underwent recanalization and balloon positioning under DSA. Patients were transferred to a short-bore MR scanner. Percutaneous transluminal angioplasty (PTA) was accomplished under MR fluoroscopy. Pre- and postinterventional ia-ce three-dimensional (3D) gradient-echo MRA with ...
The purpose was to evaluate the efficiacy of the time-of-flight MRA of the carotid artery with a 1.0 Tesla system in comparison to intraarterial digital subtraction angiography for the assessment of carotid artery disease. 101 patients with suspected stenosis of the carotid artery were examined with a 1.0 Tesla scanner in time-of-flight-technique and with the selective i.a. DSA in parallel. Morphological pathologies were registered for all arteries, stenosis of the internal carotid artery of both examinations were blindly graded by applying the NASCET criteria (mild, moderately, severely or occluded). Three different assessment methods were conducted for the MRA data. Kappa, weighted kappa, intraclass correlation were calculated for MRA results compared to DSA. Of the 84 common carotid bifurcation, 66 were classified as mild stenosis by DSA. In this category, MRA correctly identified 60 of these as mild stenosis. Among 60 common carotid artery bifurcation graded as moderate by DSA, 29 were ...
The authors compared the three-dimensional Fourier transform (3DFT) time-of-flight magnetic resonance (MR) angiograms in 38 patients initially studied with selective intraarterial digital subtraction angiography (DSA) for suspected arteriosclerotic disease of the carotid bifurcation. MR angiograms w …
The applications of digital subtraction angiography (DSA) in neurologic diagnosis have been evolving as clinical experience with this technology accumulates. Initial enthusiasm with the intravenous contrast material injections has been tempered by often equivocal results. Intravenous DSA (IV-DSA) is still an accurate screening technique for extracranial carotid atherosclerosis, comparable to duplex ultrasound. Intracranial imaging is less satisfying with intravenous injections but reliable information is available in the assessment of the venous sinuses and parasellar internal arteries. The future of DSA lies with intraarterial contrast injections, as this technique substantially decreases the risks and costs of definitive cerebrovascular investigation. ...
Results-Cervical ICA PO occurred in 21/46 (46%) patients on CTA (17 proximal cervical; 4 midcervical). Fifteen (71%) of these patients also had PO on digital subtraction angiography. A flame-shaped PO mimicking a carotid dissection was seen in 7 (33%) patients on CTA and in 6 (29%) patients on digital subtraction angiography. Patients with and without CTA PO had similar age (64.8±17.1 versus 60.2±15.7 years; P=0.35), sex (male, 47% versus 52%; P=1.00), and intravenous tissue-type plasminogen activator use (38% versus 40%; P=1.00). The rates of modified Treatment In Cerebral Ischemia 2b-3 reperfusion were 71.4% in the PO versus 100% in the non-PO cohorts (P,0.01). The rates of parenchymal hematoma, 90-day modified Rankin Scale score 0-2, and 90-day mortality were 4.8% versus 8% (P=0.66), 40% versus 66.7% (P=0.12), and 25% versus 21% (P=0.77) in PO versus non-PO patients, respectively. Multivariate analysis indicated that PO patients had lower chances of modified Treatment In Cerebral Ischemia 3 ...
With Philips Digital Subtraction Angiography (DSA) automatic examination pre-sets support a smooth and efficient workflow in angiography examinations.
Ikeda H, Shibao K, Ohkita Y, Sugi K, Koga Y, Utsu F, Toshima H (1985) A quantitative evaluation of left ventricular function by digital subtraction angiography without using contrast medium: Time-activity curve and Fourier analysis (in Japanese). Kokyu to Junkan 34 (in press)Google Scholar ...
The digital subtraction angiography method useful for three dimensional (3D) imaging of a selected volume of a body comprises the following steps. Acquiring first and second 3D data sets representative of an image of substantially the same selected volume in the body, the first and second data sets being acquired at different times corresponding to a pre- and a post injection of a contrast medium, respectively. Determining common reference points for spatially corresponding subvolumes in the data sets. Comparing in a 3D spatial manner data in subvolumes of the second data set with data in corresponding subvolumes in the first data set in order to determine a new reference point in each of the subvolumes of the first data set which results in a best match of the spatial similarity of the data in the corresponding subvolumes of the second data set. Spatially interpolating new data for the subvolumes of said first data set using the new reference points determined above and the originally acquired
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Objective: We conducted this study to demonstrate the value of non-invasive three-dimensional CT angiography (3D CTA) in the detection of a cerebral aneurysm. Material and Methods: A helical CT acquisition was obtained using non-ionic contrast media in 50 patients with 1 mm per second table speed, 1 mm collimation, and pitch 1:1. Axial source images were transferred into a workstation console (Advantage windows GE) and CTA was obtained using MIP (Maximum Intensity Projection) reconstruction. Fourteen patients underwent conventional digital subtraction angiography (DSA) after 3D CTA prior to surgery. Results: A total of 39 aneurysms were detected in 50 patients. All patients with an aneurysm were operated and the presence of aneurysms was confirmed. 3D CTA detected 38 of these 39 aneurysms. In 37 aneurysms, the origin of the aneurysm and aneurysm neck was adequately visualized. 3D CTA was found to be 100% specific and 97.2% sensitive in picking up cerebral aneurysms. 3D CTA was 97% specific in ...
Vessel segmentation is the base of 3d reconstruction of Digital Subtraction Angiograph (DSA) images. This paper proposes a framework of adaptive local thresholding based on a verification-based approach for vessel segmentation of DSA images. The original DSA image is firstly divided into overlapping subimages according to a priori knowledge of the diameter of vessels. We implement a hypothesis test to determine whether each subimage contains vessels and then choose an optimal threshold respectively for every subimage previously determined to contain vessels, with a secondary verification process to exclude the condition that the subregion only containing the background but misclassified as one containing vessels by the hypothesis test. Finally an overall binarization of the original image is achieved by combining the thresholded subimages. Experiments demonstrate superior performance over global thresholding and some adaptive local thresholding methods ...
70 year-old female with chronic obstructive pulmonary disease (COPD) presented with typical symptoms of an exacerbation of COPD. Management of COPD resolved her wheezing, but ongoing hypoxia and retrospective history of atypical chest pain prompted exclusion of a pulmonary embolus. A CT Pulmonary Angiogram (CTPA) with standard 64-slice CT revealed an extensive non-occlusive defect in a grossly dilated right pulmonary artery. Presence of circumferential cuff of soft tissue within sub-segmental pulmonary artery branch raised the possibility of pulmonary artery dissection (PAD). Exclusion of PAD was important as it precluded full anticoagulation. A dynamic CT-digital subtraction angiography (CT-DSA) with the 320-slice multidetector CT (Aquilion-one Vision, Toshiba) did not reveal any intimal flap or contrast extension into the pulmonary arterial wall, suggesting it is unlikely to be PAD. The patient was started on full anticoagulation and reported improvement of symptoms with reduction in pulmonary
BACKGROUND: Anterior inferior cerebellar artery (AICA) can present with a myriad of variations. However, the previous studies of AICA anatomy were based on small-scale cadaveric investigation. In this study, we performed an angiographic study of AICA in 500 Chinese with Han nationality based on digital subtraction angiography (DSA). METHODS: Patients admitted to our institution between 2015 and 2018 who had underwent DSA were potential candidates for this retrospective evaluation. The exclusion criteria were: a) patients with vascular diseases of the posterior circulation; b) ischemic diseases or moyamoya disease of the anterior circulation. RESULTS: Five hundred patients were identified. The patients ranged in age from 6 to 75 years. Two hundred thirty-seven (62.9%, 237 of 377) patients had bilateral AICAs at the same level, and 140 (37.1%, 140 of 377) had bilateral AICAs at different levels. The developing states of AICA were grade 0 in 31 (3.5%, 31 of 896), grade 1 in 373 (41.6%, 373 of 896), ...
As the right gastric artery is not the major contributor to the gastric bed, it is one that is often overlooked in literature relating to arterial variation. It is a highly variable artery; with studies showing it can arise from the hepatic artery proper (HAP), gastro duodenal artery (GDA) and the left, right, common or middle hepatic arteries [8,9,10]. Identification of the right gastric artery is critical, for interventional radiologists, since inadvertent chemotherapy delivery to this artery can result in significant gastric mucosal damage (necrosis, ulceration or perforation) [6,9]. Evidence shows that the correct identification and embolisation of the right gastric artery can reduce the incidence of these complications from 36% to 3% [11].. Selective internal radiotherapy (SIRT). SIRT initially gained approval in 2002 by the United States Food and Drug Administration (USFDA) for the treatment of hepatic metastases secondary to colorectal adenocarcinoma [12]. Access to the hepatic ...
The effect of demographic features on aortic arch anatomy and its role in the etiology of cerebrovascular disease Yılmaz İnanç,1 Yusuf İnanç,2 Halil Ay3 1Department of Neurology, Faculty of Medicine, Kahramanmaraş Sutcu Imam University, Kahramanmaraş, 2Department of Neurology, Faculty of Medicine, Gaziantep University, Gaziantep, 3Department of Neurology, Faculty of Medicine, Harran University, Harran, Turkey Purpose: The aim of this study was to retrospectively evaluate the distribution of aortic arches, the relationship with demographic characteristics, and the results of carotid and vertebral artery stenting procedures in patients diagnosed with cerebrovascular disease through the intra-arterial digital subtraction angiography (DSA) technique. Methods: A retrospective examination was performed on 288 patients diagnosed with cerebrovascular disease, who underwent DSA in the Department of Neurology of Gaziantep University Medical Faculty and Kahramanmaras¸ Sütç
In subtraction CT angiography (CTA), a non-contrast CT acquisition is subtracted from a contrast-enhanced CTA acquisition. Subtraction CTA can be applied in the detection, classification, and follow-up of intracranial aneurysms and is advantageous over conventional angiography because of its non-invasive nature, shorter examination time, and lower costs. Recently, an ultra-high-resolution CT scanner has been introduced in clinical practice offering an in-plane spatial resolution of up to 0.234 mm, approaching the resolution as seen during conventional invasive digital subtraction angiography (DSA). The twofold increase in spatial resolution as compared to a conventional CT scanner could improve the evaluation of small vascular structures and, coupled with dedicated post-processing techniques, further reduce metal artifacts. Technical considerations using a state-of-the-art high-resolution subtraction CTA protocol are discussed for application in the follow-up of surgical and endovascular treated
During your test you will be cared for by a team of healthcare professionals which may include a Consultant, radiographers, nurses and ECG technicians. You will be asked to lie on an x-ray couch and made as comfortable as possible. The doctor who will be doing your test will explain everything to you so you know what to expect. Your heart rate and pulse will be monitored throughout the test by one of the nursing team. The x-ray equipment is capable of moving through 360 degrees in any plane and will take a series of complex x-ray images which will be manipulated and enhanced by the radiographer.. ...
Abstract: : Purpose: Wide-angle Optomap images obtained from the Panoramic200 device captures a 200° field of the ocular fundus without dilation. In contrast, conventional digital imaging through a dilated pupil typically includes the disc and macula as the main image field. Peripheral fields must be specifically imaged in addition, if required. In this study, the accuracy of macular diagnoses made from macular images of the same eye obtained with both 50° and 200° imaging system types were compared. Methods: Thirty-five eyes were digitally imaged with both the Panoramic200 and the Topcon TRC50 50° fundus camera. Thirty-two eyes with macular disease and 3 normal eyes were studied. Images were randomly presented on a color-viewing monitor to the same retinal specialist (TRF) in a masked manner devoid of clinical information. Both color and red-free images were viewed. Diagnoses made from images acquired by each image system were compared to one another for accuracy, using the clinical ...
Purpose: To design a precise perfusion phantom mimicking capillaries of the brain vasculature which could be used to test various perfusion protocols and algorithms which generate perfusion maps. Methods: A perfusion phantom was designed in Solidworks and built using additive manufacturing. The phantom was an overall cylindrical shape of diameter and height 20mm and containing capillaries of 200μm or 300μm which were parallel and in contact making up the inside volume where flow was allowed. We created a flow loop using a peristaltic pump and contrast agent was injected manually. Digital Subtraction Angiographic images and low contrast images with cone beam CT were acquired after the contrast was injected. These images were analyzed by our own code in LabVIEW software and Time-Density Curve, MTT and TTP was calculated. Results: Perfused area was visible in the cone beam CT images; however, individual capillaries were not distinguishable. The Time-Density Curve acquired was accurate, sensitive ...
The last years have seen rapid progress in algorithms development for enhancing information in medical image data. Medical images play an important role in clinical diagnosis, therapy, research and teaching. To transfer the technical advances in this field into clinical practice, translational research efforts within a multidisciplinary team including basic scientists, clinical scientists and physicians are essential. In this talk, selected applications focusing on magnetic resonance imaging and 3D digital subtraction angiography (DSA) are presented that illustrate this concept ...
The purpose of the study was to evaluate the diagnostic performance of non- invasive imaging methods of detecting carotid artery stenosis in comparison to digital subtraction angiography (DSA) by undertaking a systematic review of the literature. The non-invasive methods reviewed include multislice computed tomography (MSCT) angiography, duplex ultrasound (US) and magnetic resonance (MR) angiography.A search of medical databases (PubMed, Medline, ScienceDirect, Proquest) of the English literature was performed and 22 studies with 68 comparisons were found to meet the selection criteria and included in our study. 5 studies were performed with MSCT angiography, 11 with duplex US and 13 with MR angiography. Both duplex US and MR angiography were studied in 7 out of 24 US and MR studies. The diagnostic value of each imaging modality was reviewed in terms of the sensitivity and specificity compared to DSA, which is regarded as the standard method.The mean sensitivity and specificity for MSCT ...
Methods MRI was performed for suspicion of CVS. For quantitative evaluation, the brain was partitioned into 19 arbitrary segments of comparable volume. Segments with PWI/DWI mismatch were defined as segment at risk (SR). In these cases, MRI was followed by angiography (digital subtraction angiography (DSA)) including endovascular treatment. 48±12 h after treatment, a second MRI was performed and the treatment was repeated if new or remaining SR were observed. Efficacy was classified as the percentage of reduced diameter of the proximal cerebral arteries on DSA following the treatment: mild (≥33%), moderate (34-66%) or severe (≥67%). ...
Class II:. PRODUCT. DIGITAL ANGIOGRAPHY SYSTEM: This system is intended to be used for radiologic visualization of the heart, blood vessels or lymphatic system during or after injection of a contrast medium. It is to be used in the diagnosis of the circulatory vascular system while being combined with a positioning device and other devices.. Recall Number: Z-0959-2019. REASON. Normal operation of the device is to power up the device in the morning, register the first patient, and then perform a fluoroscopy. If, however, the user powers up the device in the morning and makes an error by starting a fluoroscopy while the first patient is still being registered, the device application will abnormally terminate and require service intervention before it can be used again. This event will not occur after the first patient procedure.. RECALLING FIRM/MANUFACTURER. Shimadzu Medical Systems Usa Com on 1/14/2019. Voluntary: Firm Initiated recall is ongoing.. VOLUME OF PRODUCT IN ...
A digital subtraction angiography method useful for processing a mask and contrast series of two dimensional (2D) images acquired by rotational imaging of a selected volume of a body. The method reduces image artifacts caused by misregistration, and is unique in that for registration purposes it treats the acquired 2D images as a volume. The individual 2D images are stacked in a sequence so as to have the dimensions x, y and θ. A flexible volume registration is then performed to bring the mask and contrast volumes into a close match prior to subtraction.
Next, the authors focus on recent literature data related to the role of endothelial nitric oxide and inducible nitric oxide in physiological and pathophysiological conditions. Nitric oxide is a free radical which, in reactions with various molecules, causes multiple biological effects. It is exceptionally regulated and extends to almost every cell type and function within circulation.. Extracranial carotid artery stenosis is a major cause of stroke and is treated with either carotid endarterectomy (CEA) or percutaneous transluminal angioplasty (PTA) and carotid artery stenting (CAS). In this collection, several types of imaging study have been used to identify complications related to in-stent restenosis, including Doppler ultrasound, computed tomography angiography, digital subtraction angiography, magnetic resonance angiography, intravascular ultrasound, and optical coherence tomography.. The authors go on to discuss some recent randomized studies that compared different d rug-eluting balloon ...
Digital Subtraction Angiography (DSA) is an x-ray imaging modality for visualizing blood vessels. The DSA image is obtained by the logarithmic subtraction of an x-ray image with and without contrast agent in the blood vessel, called contrast image and mask image respectively. The aim of this work is to estimate the mask image from the given contrast image. Since the mask image will be estimated using the contrast image, the patient in a clinical setup will receive fewer x-ray doses for the same DSA protocol. ...
Currently methods to reduce radiation and contrast media application in endovascular repair of aortic aneurysms (EVAR) are investigated. First positive results for real-time contrast medium- enhanced ultrasonography (CEUS) guided endovascular aortic repair have been reported. A combination with image fusion of CEUS and preoperative multi-slice computed tomography (MS-CT) might offer added safety regarding stent-graft positioning and sealing of the landing zones. EVAR was performed in a patient with an asymptomatic infrarenal aortic aneurysm and a penetrating aortic ulcer in the neck region. The precise placement of the stent-graftwas performed with CEUS using image fusion and native intraprocedural angiographic fluoroscopy and confirmed with digital subtraction angiography (DSA) using iondinated contrast media. At follow-up, CEUS was used to exclude endoleaks and stent-graft failure or malposition. The precise CEUS-guided placement of the stent-graft was technically successful. No artifacts due ...
Keywords: Three-dimensional (3D) CT angiography, Temsirolimus Digital subtraction angiography, Coronary luminal stenosis Background Atherosclerotic plaque leads to progressively increasing luminal stenosis, which could result in fatal cardiac events. Coronary angiography is currently the gold standard technique for assessment of coronary lumen stenosis Temsirolimus or occlusion [1C4]. However, it is an invasive procedure. A catheter should be used to insert into the coronary arteries for injecting dye, which would induce discomfort for the patient. Furthermore, it has limitations of differentiating plaque components [5]. Therefore, it is of paramount importance to evaluate the lumen stenosis using non-invasive imaging techniques. During the past decades, CT angiography (CTA) has become a rapidly developing non-invasive imaging technique, which showed promising application in the identification, visualization and characterization of the coronary artery stenosis [6, 7]. Sun et al. [8, 9] have ...
An area of your body, usually the groin, is cleaned and numbed with a local numbing medicine (anesthetic). A thin, hollow tube called a catheter is placed through an artery. The catheter is carefully moved up through the main blood vessels in the belly area and chest into an artery in the neck. X-rays help the doctor guide the catheter to the correct position. Once the catheter is in place, the dye is sent through the catheter. X-ray images are taken to see how the dye moves through the artery and blood vessels of the brain. The dye helps highlight any blockages in blood flow.. Sometimes, a computer removes the bones and tissues on the images being viewed, so that only the blood vessels filled with the dye are seen. This is called digital subtraction angiography (DSA).. After the x-rays are taken, the catheter is withdrawn. Pressure is applied on the leg at the site of insertion for 10 to 15 minutes to stop the bleeding or a device is used to close the tiny hole. A tight bandage is then applied. ...
Seven hundred ninety-five patients in whom aneurysmal SAH was demonstrated by computed tomography, and in whom one or more intracranial aneurysms had been diagnosed, underwent transcranial Doppler (TCD) studies between April 1998 and January 2000. In 154 patients angiography was performed within 24 hours of the TCD examination, and in 75 133Xe cerebral blood flow (CBF) studies were obtained the same day. Seven cases were excluded because of a limited sonographic window. Forty-one women (60.3%) and 27 men (39.7%) between the ages of 35 and 84 years (58.0 ± 13.2 years [mean ± standard deviation]) were included. Clinical characteristics analyzed included age, sex, Hunt and Hess grade, Fisher grade, days after SAH, day of treatment, type of treatment (coil embolization, surgical clip occlusion, or conservative treatment), smoking history, and hypertension history. Lindegaard ratios and spasm indexes (TCD velocities/hemispheric CBF) were calculated bilaterally. Digital subtraction angiography ...
The Multi Modality Viewer (MMV) now supports viewing and post processing of angiography images and series. Review and perform analysis of angiographic imaging alongside other modalities for a comprehensive review of the patient case. Perform vascular processing of images (Digital Subtraction Angiography) - subtraction, pixel shifting and land marking. Include key images into the generic MMV report. Prior to the intervention, relevant diagnostic (MR and or CT) data can be bookmarked and automatically retrieved upon patient selection in the Allura, or the Azurion suites. ...
Between October 2013 and July 2014, consecutive elective branched and fenestrated endovascular aortic repair (EVAR) procedures performed in a hybrid operating theatre were prospectively analysed. Body (over-lead and under-lead) and head doses were measured for the primary and assistant operator using electronic dosimeters. Fluoroscopy and digital subtraction angiography (DSA) acquisition times, C-arm angulation, dose area product (DAP) and operator height were recorded. Data were analysed using Mann-Whitney U test and linear regression modelling.. Seventeen cases were analysed (Crawford II [n=4], Crawford III [n=2], Crawford IV [n=11]) with a median operative time of 280 (IQR 200-330) minutes. Median age was 76 (71-81) years; median body mass index was 28 (25-32) kg/m2; 82% were male. Stent grafts incorporated branches only (n=4), fenestrations only (n=10) or a mixture of branches and fenestrations (n=3). A total of 21 branches and 37 fenestrations were cannulated and stented.. Head dose was ...
​Investigative Radiology publishes original, peer-reviewed research from clinical and basic science investigations in diagnostic imaging, focusing on magnetic resonance, computed tomography, ultrasound, digital subtraction angiography and new technologies. An additional major focus is intravenous contrast media, including clinical trials, development, and the field of theranostics. Emphasis is on early and timely publication. The journal is highly selective, with the current acceptance rate being 14% and an impact factor of 6.224. Primarily research-oriented, Investigative Radiology - due to publication of leading edge technology - includes a wide variety of papers of interest to clinical radiologists.
TY - JOUR. T1 - Negative CT angiography findings in patients with spontaneous subarachnoid hemorrhage. T2 - When is digital subtraction angiography still needed?. AU - Agid, Ronit. AU - Andersson, T.. AU - Almqvist, H.. AU - Willinsky, R. A.. AU - Lee, S. K.. AU - TerBrugge, K. G.. AU - Farb, R. I.. AU - Söderman, M.. PY - 2010/4. Y1 - 2010/4. N2 - BACKGROUND AND PURPOSE: CTA is becoming the frontline modality to reveal aneurysms in patients with SAH. However, in about 20% of SAH patients no aneurysm is found. In these cases, intra-arterial DSA is still performed. Our aim was to evaluate whether negative findings on CTA can reliably exclude aneurysms in patients with acute SAH. MATERIALS AND METHODS: We conducted a retrospective analysis of all negative findings on CTAs performed from 2005 to 2009 in patients with spontaneous SAH. Findings were compared with DSA. CTAs were performed with a 64-section multidetector row CT scanner. RESULTS: One hundred ninety-three patients with SAH and negative ...
Rapid diagnosis of thoracic aortic transection using intravenous digital subtraction angiography. Limited value of technetium 99m-labeled red cell scintigraphy in localization of lower gastrointestinal bleeding
PURPOSE: To prospectively compare the accuracy of 16-detector row computed tomographic (CT) angiography with conventional digital subtraction angiography (DSA) as the reference standard in the assessment of aortoiliac and lower extremity arteries in patients with peripheral arterial disease. MATERIALS AND METHODS: This study was approved by the institutional review board, and informed consent was obtained. A total of 39 consecutive patients (27 men [mean age, 66 years] and 12 women [mean age, 64 years]) with peripheral arterial disease underwent both conventional DSA and 16-detector row CT angiography. For data analysis, the arterial vascular system was divided into 35 segments. A total of 1365 arterial segments were analyzed for arterial stenosis by two independent blinded readers using a four-point grading system (grade 1, ,10% luminal narrowing; grade 2, 10%-49% luminal narrowing; grade 3, 50%-99% luminal narrowing; grade 4, occlusion). Interobserver agreements were calculated by using kappa ...
J Neurosurg 127:725-731, 2017. The study aimed to assess the diagnostic accuracy of 320-detector row nonsubtracted and subtracted volume CT angiography (VCTA) in detecting small cerebral aneurysms (, 3 mm) compared with 3D digital subtraction angiography (3D DSA).. METHODS Six hundred sixty-two patients underwent 320-detector row VCTA and 3D DSA for suspected cerebral aneurysms. Five neuroradiologists independently reviewed VCTA and 3D DSA images. The 3D DSA was considered the reference standard, and the sensitivity, specificity, and accuracy of nonsubtracted and subtracted VCTA in depicting small aneurysms were analyzed. A p value , 0.05 was considered a significant difference.. RESULTS According to 3D DSA images, 98 small cerebral aneurysms were identified in 90 of 662 patients. Nonsubtracted VCTA depicted 90 small aneurysms. Ten small aneurysms were missed, and 2 small aneurysms were misdiagnosed. The missed small aneurysms were located almost in the internal carotid artery, near bone tissue. ...
TY - JOUR. T1 - Three-dimensional time-of-flight MR angiography. T2 - Applications in the abdomen and thorax. AU - Lewin, J. S.. AU - Laub, G.. AU - Hausmann, R.. PY - 1991/1/1. Y1 - 1991/1/1. N2 - The application of three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) angiographic techniques to the vasculature of the abdomen and thorax has not, to the authors knowledge, been previously reported; this is possibly due to the large amount of physiologic motion in these regions along with the anticipated sensitivity of the 3D acquisition scheme to image degradation caused by motion artifact. The authors describe an asymmetric short-echo velocity-compensated 3D TOF technique that minimized the effects of physiologic motion on image quality and provided rapid high-resolution 3D MR arteriograms of the abdomen and thorax. Contiguous 3D volumes were often combined to provide sufficient anatomic coverage. Benefits include high spatial resolution and minimization of signal loss; ...
Conray is indicated for use in excretory urography, cerebral angiography, peripheral arteriography, venography, arthrography, direct cholangiography, endoscopic retrograde cholangiopancreatography, contrast enhancement of computed tomographic brain images, cranial computerized angiotomography, intravenous digital subtraction angiography and arterial digital subtraction angiography. Conray may also be used for enhancement of computed tomographic scans performed for detection and evaluation of lesions in the liver, pancreas, kidneys, abdominal aorta, mediastinum, abdominal cavity and retroperitoneal space ...
Atherosclerosis of the lower leg arteries is a common disease. Patients with this condition has symptoms of ischemia, for instance intermittent claudication (pain during exercise). Diagnosis of atherosclerosis in the legs is normally done with an interventional x-ray-based angiography (DSA- digital subtraction angiography). This is uncomfortable for the patient, and associated with risks of complications (bleeding, vascular damage, embolism).A novel approach to diagnosing atherosclerosis is the use of magnetic resonance angiography. A variant of this is the whole body magnetic resonance angiography(WB-MRA), that produce a picture of the arteries in almost the whole body (excluding the coronary arteries). WB-MRA has a number of advantages compared to DSA. It does not use ionizing radiation, is not invasive, uses a contrast medium with fewer side affects and finally gives a covers a great deal of the arteries in the body.. This study will compare WB-MRA with DSA in patients with symptoms of ...
2Akdeniz University, School of Medicine, Department of Radiology, Antalya, Turkey DOI : 10.5137/1019-5149.JTN.10299-14.3 AIM: To understand the late anatomical results of surgically treated intracranial aneurysms (IAs) and to investigate the incidence of recurrent, de novo aneurysms, the natural history of residual aneurysms, and the morphological changes in temporarily clipped vascular segments.. MATERIAL and METHODS: A total of 117 patients underwent screening with digital subtraction angiography (DSA) or computed tomographic angiography (CTA) in a range of 3 - 13 years. Late angiographies were evaluated in terms of recurrence, change in known residua, the presence of de novo aneurysms and the morphological changes in temporarily clipped vessels. We also analysed the cumulative data including previously published results.. RESULTS: In the long-term DSA, three residual aneurysms were observed to be enlarged while four remnants showed no morphological change. In one patient, spontaneous ...
TY - JOUR. T1 - Videodensitometric quantitation of stenosis. T2 - In vitro and in vivo validation. AU - Seibert, J Anthony. AU - Link, Daniel P. AU - Hines, H. H.. AU - Baltaxe, H. A.. PY - 1985. Y1 - 1985. N2 - Percentage of stenosis of a vascular lumen was quantitated using a digital subtraction angiography system with videodensitometric analysis. To validate the algorithm and methods, we used precisely drilled Lucite rods of three inner diameters and various reduced diameters to give known luminal reduction. Both in vitro and in vivo results of stenosis measurements resulted in an excellent correlation between actual and measured values (correlation coefficient , 0.9 for all trials). Consistent underestimation of stenosis of about 5% was attributed to the various image degradations inherent with the imaging procedure and equipment. Errors were greatest with mid range stenoses and less at the extremes of the lesion values. An insufficient signal-to-noise ratio was caused by low photon flux ...
In most cases, the disease can be detected during a normal checkup with a physician. Some of the tests a physician can use or order include history and physical exam, doppler ultrasound imaging, oculoplethysmography (OPG), computed tomography (CT), arteriography and digital subtraction angiography (DSA), and magnetic resonance angiography (MRA). Frequently, these procedures are carried out in steps. First, there is the doctors evaluation of signs and symptoms then an ultrasound. Arteriography, DSA or MRA are reserved for difficult diagnoses.. A doctor will ask about symptoms of a stroke such as numbness or muscle weakness, speech or vision difficulties, or lightheadedness. Using a stethoscope, a doctor may hear a rushing sound, called a bruit (pronounced brew-ee), in the carotid artery. Unfortunately, dangerous levels of disease sometimes fail to make a sound, and some blockages with a low risk can make a sound.. Doppler ultrasound imaging. This is a painless, noninvasive test in which sound ...
In patients presenting with a suspected acute stroke, clinicians attempt to confirm the presence of cerebral ischemia, identify the extent of the neurological deficit, and determine the etiology of the event. To detect a carotid source, patients usually undergo carotid duplex scan, CT angiography, conventional MRA, or digital subtraction angiography, all of which rely heavily on percent stenosis. Although these methods can detect luminal narrowing to a high degree of certainty, they cannot identify unstable plaque components. The current study and others have shown that stenosis does not fully determine the potential for embolization from the carotid artery. Traditionally, mild and moderate carotid artery stenoses have been overlooked as potential sources for thromboembolic stroke.. Although studies have found that complex carotid plaques (American Heart Association Type VI plaques) are associated with increased risk of subsequent events,7 the final common pathway has not been evaluated ...
BACKGROUND: Magnetic resonance angiogram (MRA) of the brain is a widely employed non-invasive test to diagnose aneurysms. However, its overall accuracy is less than digital subtraction angiography and is prone to give false-positive or false-negative results. False-negative results can be seen with hemorrhage, lipoma, dermoid, posterior lobe of the pituitary gland, and the flow artifacts. PURPOSE: To describe the findings associated with false aneurysms in the anterior communicating artery on the time of flight MRA and review the physical principles behind this artifact. MATERIAL AND METHODS: This short series comprises of four patients whose MRA showed suspicious aneurysms in the region of the anterior communicating artery (ACOM) on time of flight MRA. RESULTS: Two patients underwent catheter angiogram and the other two patients had computed tomography angiogram. None of these cases proved to have aneurysms and normal anterior communicating arteries were seen in all the patients. The findings on the MR
Winterer, J.; Laubenberger , J.; Scheffler, K.; Neumann, K.; Bayraktarli , Y.; Allmann, K.-H.; Uhrmeister, P.; Langer, M.: Contrast-Enhanced Subtraction MR Angiography in Occlusive Disease of the Pelvic and Lower Limb Arteries: Results of a Prospective Intraindividual Comparative Study with Digital Subtraction Angiography in 76 Patients. Journal of Computer Assisted Tomography 23 (4), pp. 583 - 589 (1999 ...
OBJECTIVE: To evaluate the value of magnetic resonance imaging (MRI) and three dimensional (3D) contrast magnetic resonance angiography (MRA) in the diagnosis of complications of simultaneous pancreas-kidney transplantation (SPKT), as confirmed by biopsy and digital subtraction angiography (DSA). METHODS: Five MR examinations of five patients were performed within 28 days to 2 years after surgery on GE 1.5T MR system. Imaging techniques included axial and sagittal chemical fat-suppressed T1-weighted image (T1WI) and T2-weighted image (T2WI), additional contrast axial or saggital chemical fat-suppressed T1WI were obtained after 3D contrast MRA for calculating the mean percentage of the parenchymal enhancement (MPPE) of the pancreas and kidney ...
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DescriptionAmong the several factors related to high mortality, imaging methods and intervention procedures could be important. American College of Radiologists (ACR) prescribed some appropriateness guidelines for diagnostic imaging. Not complying with them fully or partially may also be a mortality factor. The present study was undertaken to investigate these aspects. NIS data for the period of 2008-2012 using ICD-9 codes were obtained for 6 types of aneurysms- intact and ruptured Abdominal Aortic Aneurysm (AAA), Thoracic Aneurysm and Thoracio-Abdominal Aneurysm; four imaging methods: Computerized Tomography (CT), Magnetic Resonance Imaging (MRI), Ultrasound (US) and Digital Subtraction Angiography (DSA) as diagnostic imaging methods; EVAR or OAR as the intervention procedures; patient characteristic factors of age, gender, race, comorbidities and insurance type; and hospital context factors of size, location and teaching status, region and admission type. The dependent variables were total, ...
by Physicians Weekly , Aug 24, 2010. Rapid advancements in endovascular interventions have facilitated the use of intracranial endovascular interventions to treat cerebrovascular diseases using minimally invasive intravascular techniques. Developments in computer-aided imaging and high-resolution digital subtraction angiography with reconstruction techniques, as well as easier access to the cerebral vasculature through improved microcatheter design, have lured the interest of physicians across multiple specialties. Consequently, the increasing popularity of these interventions has led to some controversy regarding who should perform these procedures and the methods of training. Other controversies surround how the efficacy and safety of endovascular procedures compare with standard open procedures. Considering these issues, guidelines have been released by the American Heart Association (AHA) and American Stroke Association (ASA). Published in the April 6, 2009 issue of Circulation, the ...
Computer tomography angiography and digital subtraction angiography as two valuable methods in the early diagnosis and treatment of intracranial aneurysms - a comparative ...
Vascular malformations (VM) are complex lesions present in various anatomical locations with a variety of clinical manifestations. Time-resolved MRA combined with parallel imaging and echo sharing schemes offer a reasonable alternative to more invasive diagnostic methods such as digital subtraction angiography (DSA) in evaluation of VMs. MRI is becoming the imaging modality of choice in assessing morphological issues regarding VMs. Time-resolved MRA can play an important role in characterizing these lesions and can influence therapeutic decision-making. [...] ...
The purpose of this study was to evaluate the stability of the Leksell Frame G in Gamma Knife radiosurgery (GKR). Forty patients undergoing GKR underwent pretreatment stereotactic MRI for GKR planning and stereotactic CT immediately after GKR. The stereotactic coordinates of four anatomical landmarks (cochlear apertures and the summits of the anterior post of the superior semicircular canals, bilaterally) were measured by two evaluators on two separate occasions in the pre-treatment MRI and post-treatment CT scans and the absolute distance between the observations is reported. The measurement method was validated with an indepen-dent group of patients who underwent both stereotactic MRI and CT imaging before treatment (negative controls; n: 5). Patients undergoing GKR for arteriovenous malformations (AVM) also underwent digital subtraction angiography (DSA), which could result in extra stresses on the frame. The distance between landmark local-ization in the scans for the negative control group ...
DOM: January 1994.. This OEC C-Arm features Dual Monitors, 9″ Image Intensifier, 60 Image Storage, LIH Last Image Hold, DSA Digital Subtraction Angiography, Road-Mapping, One-Shot, Sharpen Function, Zoom, Auto-Save, and Foot Switch. Unit operates in 120V, 50/60Hz. This mobile unit can meet your various orthopedic, general surgery, and pain management requirements. It is capable of fluoroscopy with normal and boost modes (0.2-5.0 mA and up to 20 mA, respectively) and can operate on a continuous or one-shot basis. It can perform long procedures because of its rotating anode x-ray tube and quick cooling rate. Dual 17-inch video monitors display your images, and these images may be sent to a thermal printer or transferred to an external DICOM box.. When your needs increase and your practice is ready to move up to the next level, the GE OEC 9400 c-arm can expand and grow in usefulness with you. Specialty packages and options are available, including expanded surgical platforms and special procedure ...
Of 28 978 ICMS completed, adverse reactions were recorded in 63 patients; 49 of these were anaphylactoid. Patients were matched for age (± 5 y) and sex, type and osmolality of contrast medium, and date (± 4 d) of procedure. 34 patients reacting during computed tomography were matched to 2 controls each; 15 patients who had reactions during intravenous pyelography, digital subtraction angiography, and venography were matched to 1 control each. Patients who reacted (n = 49) and patients in the control group (n = 83) were similar with respect to antihistamine and corticosteroid medicafion use ...
Frank M. Meno was born in Prapretno, Yugoslavia, but received higher education in Germany and America. He earned degrees in physics, electrical engineering, and biomedical technology from the Carnegie-Mellon University, and was on the faculty of the Medical School at the University of Pittsburgh. Professionally he was involved in the development of medical instrumentation, including nuclear magnetic resonance and X-ray imaging, electroencephalography, and various other diagnostic modalities. Among his more significant technical implementations are digital subtraction angiography, and a nuclear gauge for online non-chemical sulfur measurement in crude oil. He holds eight patents, has authored some forty publications on various subjects, and is mentioned in Whos Who. Menos interest in fundamental physical reality led him to formulate a new theory which accounts for all known physical phenomena. This theory reverts to the concepts advanced by Newton and the ancient Greeks. By introducing certain ...
Maximum Intensity Projection (MIP) consists of projecting the voxel with the highest attenuation value on every view throughout the volume onto a 2D image 1. Such an algorithm is rather simple: for each XY coordinate, only the pixel with the hig...
Results. Ultrasonographically 22 presented stenosis (73.3%), 8 cases (36%) were mild, 9 cases (40.9%) moderate, 3 cases (13.6%) severe and obstruction in 2 (9%). Angiographically 12 (40%) stenosis cases were corroborated. AngioCT showed stenosis in 20 arteries (66.6%). Six cases were mild (30%), 7 (35%) moderate, 5 (25%) severe and 2 had obstruction (10%). These were corroborated in 50% with digital angiography. The sensitivity for US was 81%, for angioCT 100%, the specificities were 73% and 76%, respectively, the positive predictive value was 64% for both methods, and the negative predictive values were 87% and 100%, respectively ...
TY - JOUR. T1 - Tailored optimization of pediatric body MR angiography for successful outcomes in thoracic applications. AU - Liszewski, Mark C.. AU - Kurian, Jessica. PY - 2020/5. Y1 - 2020/5. N2 - OBJECTIVE. The purpose of this article is to describe optimized techniques for successful thoracic MR angiography (MRA) in children and to review examples of commonly encountered conditions. CONCLUSION. Successful MRA in children relies on considering the specific child and condition being evaluated and making appropriate choices about the most suitable modality, the use of anesthesia, and the best MRA techniques to determine a diagnosis.. AB - OBJECTIVE. The purpose of this article is to describe optimized techniques for successful thoracic MR angiography (MRA) in children and to review examples of commonly encountered conditions. CONCLUSION. Successful MRA in children relies on considering the specific child and condition being evaluated and making appropriate choices about the most suitable ...
During the European Congress of Radiology 2014 (Wien, March 6 - 10) was exhibited the Research Automated carbon dioxide digital angiography for lower limb arterial disease evaluation: safety assessment and comparison with standard iodinated contrast media angiography by Filippo Scalise, MD, Monza Hospital, Italy.. To consult the entire abstract, please click on the following link: Abstract Scalise E ...
A method for processing a digital mesh representing a three-dimensional subject is described. The method comprises utilizing smoothed splines to identify inflection points on the mesh for further processing.
In a first experiment, adults were asked to solve one-digit additions, subtractions and multiplications. When the sign appeared 150 ms before the operands, addition and subtraction were solved faster than when the sign and the operands appeared simultaneously on screen. This priming effect was not observed for multiplication problems. A second experiment replicates these results on addition and multiplication and, moreover, shows that the priming effect in addition is observed for all problems, including very small ones such as 4+3. In fact, the only problems that were not primed by the addition sign were tie problems, which confirms that they have a special status in memory. Taken together, these results suggest that abstract procedures are pre-activated by the addition and subtraction signs and that these procedures are consequently used by adults to solve the problems. No such procedures would be pre-activated for multiplication, which are then most probably solved by retrieval of t
BACKGROUND AND PURPOSE: We attempted to evaluate the location of vascular lesions in cases of cerebrovascular steno-occlusive diseases in Chinese persons living in Taiwan. METHODS: With three-dimensional time-of-flight magnetic resonance angiography (MRA) as a screening tool, 108 symptomatic patients with cerebrovascular steno-occlusive diseases were examined. Cardioembolic disease and cerebral hemorrhage ...
Structured decorative patterns are common ornamentations in a variety of media like books, web pages, greeting cards and interior design. Creating such art from scratch using conventional software is time consuming for experts and daunting for novices. We introduce DecoBrush, a data-driven drawing system that generalizes the conventional digital ``painting concept beyond the scope of natural media to allow synthesis of structured decorative patterns following user-sketched paths. The user simply selects an example library and draws the overall shape of a pattern. DecoBrush then synthesizes a shape in the style of the exemplars but roughly matching the overall shape. If the designer wishes to alter the result, DecoBrush also supports user-guided refinement via simple drawing and erasing tools. For a variety of example styles, we demonstrate high-quality user-constrained synthesized patterns that visually resemble the exemplars while exhibiting plausible structural variations.. ...
Main scope of my work is the root structure and impacts of environmental factors on it, as well as structural aspects of metal uptake and (hyper)-accumulation. The focus is on root apoplastic barriers and their relation with metal uptake using fluorescence microscopy (widefield epi-fluorescence), brightfield microscopy (conventional/digital, up-right/inverted), confocal microscopy (LSCM), electron microscopy (SEM, TEM, EDAX) as well as image processing and analysis (LIM, Lucia, ImageJ, WinRhizo ...
1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures. Along with development of catheters, embolic materials, pushable coils and the GDC coils there was simultaneous development and improvement of 2D DSA image quality and the introduction of 3D DSA ...
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Lowering production costs and enhancing the manufacturing process are just two of the many things that 3D Digital Corp can help your business accomplish. Our practical and down to earth services and products are a great way to help speed up various processes in your manufacturing applications. Contact us today to learn more about our Optix line of 3D scanners and how we can help you be more productive.. ...
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Analysis of SSH-MOS subtraction efficiency. A) Cclap-ps male-specific transcript expression profile at early embryonic stages: first lane= DNA marker, 1=unferti
Kaneko-Ishino T, Kuroiwa Y, Miyoshi N, Kohda T, Suzuki R, Yokoyama M, Viville S, Barton SC, Ishino F, Surani MA Peg1/Mest imprinted gene on chromosome 6 identified by cDNA subtraction hybridization. Nat Genet 1995: 11(1):52-59 Goo luck narendra ...
Flow voids refer to a signal loss occurring with blood and other fluids, like CSF or urine, moving at sufficient velocity relative to the MRI apparatus. It is a combination of time-of-flight and spin-phase effects usually seen in spin-echo techni...
identificador de objeto digital (es); DOI-númer (is); Digital object identifier (shn); Pengecam objek digital (ms); Digital object identifier (en-gb); Идентификатор на дигитален обект (bg); Digital object identifier (ro); ڈیجیٹل اشیا کی شناخت (ur); Digital Object Identifier (sk); Digital Object Identifier (oc); 數位物件識別碼 (zh-hant); 디지털 객체 식별자 (ko); Diĝita Objektidentigilo (eo); Digital Object Identifier (cs); Digital Object Identifier (bar); डिजिटल चीज पहिचानक (bho); ডিজিটাল অবজেক্ট আইডেন্টিফায়ার (bn); digital object identifier (fr); Pangidhèntifikasi Obyèk Digital (jv); Digitalni identifikator objekta (hr); डिजीटल ऑब्जेक्ट आयडेंटीफायर (mr); Digital object identifier (or); Digitālais objektu identifikators (lv); Digital object identifier (ilo); дигитални ...
The Branson range of ultrasonic cell disrupters have been used for biological research applications since 1960. The Sonifier® products have grown into a full line of products and accessories to meet the demanding needs of this rapidly expanding market. Today Branson is a world leader in this technology ...
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May 15, 2008 Since QCC allows subtraction of background in real-time (1 second down to 100 ms), SAM 940 systems are appropriately specified for short acquisitions down to 1 second or less. For RIIDs, 2 x 2 in. NaI detector lets user ID presence of Cs137 at less than 1 µrem/hr/sec. Also available, 3 x 3 in. NaI detector is capable of identifying Cs137 at 500 nrem/hr/sec. Stabilization is performed with K40,... Read More. ...
First Grade Math Resources Help your 1st graders easily and effectively learn important concepts like subtraction with new resources from TeacherVision partner Amdon and Pagewerkz! These colorful worksheets can be used as in-class or take-home activities ...
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DF = Digital Fluoroscopy (retired). *DG = Diaphanography. *DM = Digital Microscopy. *DS = Digital Subtraction Angiography ... DICOM, abreviação de Digital Imaging and Communications in Medicine (ou comunicação de imagens digitais em medicina), é um ...
Computed Tomography Angiography Intravenous digital subtraction angiography "microangiography". The Free Dictionary. Takeshita ... "Micro-angiography for tumor vessel imaging" (PDF). Retrieved 2009-06-10. Bollinger A, Amann-Vesti BR (June 2007). "Fluorescence ... Microangiography (/ˌmaɪkroʊˌændʒiˈɒɡrəfi/ MY-kro-AN-jee-OG-rə-fee) is a type of angiography that consists of the radiography of ... While most other types of angiography cannot produce images of vessels smaller than 200 µm in diameter, microangiography does ...
In Digital Subtraction Angiography (DSA), the images are acquired digitally.[citation needed] Magnetic resonance angiography ( ... Magnetic resonance angiography uses magnetic fields and radio waves to provide detailed images of the blood vessels. The doctor ...
This is based on MRI scan, magnetic resonance angiography and CT scan. A cerebral digital subtraction angiography (DSA) ... High resolution digital subtraction angiography may help in classifying CCF into dural and direct type and thus formulate a ...
Comparison to Digital Subtraction Angiography". Radiology. 290 (1): 246-253. doi:10.1148/radiol.2018172927. ISSN 0033-8419. ... "Digital Variance Angiography as a Paradigm Shift in Carbon Dioxide Angiography". Investigative Radiology. 54 (7): 428-436. doi: ... See also: Digital variance angiography The diagnostic value of radiographic images is limited by image quality, which can be ... Digital variance angiography X-ray imaging Fluoroscopy Signal-to-noise ratio Szigeti, K.; Máthé, D.; Osváth, S. (2014-10-01). " ...
The gold standard is cerebral angiography (with or without digital subtraction angiography). This involves puncture of a large ... MR angiography). They use smaller amounts of contrast and are not invasive. CT angiography and MR angiography are more or less ... When MR angiography is used, the best results are achieved in the T1 setting using a protocol known as "fat suppression". ... Angiography also does not directly demonstrate the blood in the vessel wall, as opposed to more modern modalities. The only ...
The DR 960 was introduced in 1982 as a digital subtraction angiography device. Rather than injecting contrast material into an ... A digital image was acquired without contrast and one with, and the images subtracted from each other leaving the arterial ... essentially a digital x-ray that was produced by moving the body through the gantry with the x-ray tube stationary. This ...
In 1989, capability for magnetic resonance imaging (MRI) and digital subtraction angiography (DSA) was introduced. Northern ... Radiology & Medical Imaging: NWH uses digital imaging techniques to provide accurate test results including MRI, PET/CT scans, ... CAT scans, ultrasounds and digital X-rays. Stereotactic Radiosurgery: Offering both the Gamma Knife and the Novalis ...
... validated by digital subtraction angiography". AJNR. 27 (7): 1565-72. PMID 16908582. Greathouse, David G.; Halle, John S.; ... "MR Angiography and CT Angiography of the Artery of Adamkiewicz: Noninvasive Preoperative Assessment of Thoracoabdominal Aortic ... Nijenhuis RJ, Mull M, Wilmink JT, Thron AK, Backes WH (2006). "MR angiography of the great anterior radiculomedullary artery ( ... Its location can be identified with computed tomographic angiography. It is named for Albert Wojciech Adamkiewicz. Milen, Mark ...
Comparison of computed tomography angiography with digital subtraction angiography in the assessment of clipped intracranial ... CT Angiography and MR Angiography for Detection-Prospective Blinded Comparison in a Large Patient Cohort". Radiology. 219 (3): ... Once suspected, intracranial aneurysms can be diagnosed radiologically using magnetic resonance or CT angiography.[16] But ...
... by Digital Subtraction Imaging". Journal of Zoo and Wildlife Medicine. 30 (2): 235-241. PMID 10484138.. ... "Magnetic Resonance Angiography (MRA)". Johns Hopkins Medicine.. *^ "Angiography". National Health Service. Retrieved 29 April ... Angiography using X-rays or magnetic resonance angiography are methods to visualize blood vessels.[8][9][10][11] ... Gribble N, Reynolds K (1993). "Use of Angiography to Outline the Cardiovascular Anatomy of the Sand Crab Portunus pelagicus ...
... by Digital Subtraction Imaging". Journal of Zoo and Wildlife Medicine. 30 (2): 235-241. PMID 10484138. "Magnetic Resonance ... Angiography using X-rays or magnetic resonance angiography are methods to visualize blood vessels. The term "anatomy" is ... "Angiography". National Health Service. Retrieved 29 April 2014. Dorit, R. L.; Walker, W. F.; Barnes, R. D. (1991). Zoology. ... Gribble N, Reynolds K (1993). "Use of Angiography to Outline the Cardiovascular Anatomy of the Sand Crab Portunus pelagicus ...
Today, the gold standard imaging remains invasive pulmonary angiography (PAG) using native angiograms or a digital subtraction ... of ventilation/perfusion scanning and multidetector computed tomography pulmonary angiography with pulmonary angiography". ... Both V/Q scanning and modern multidetector CT angiography (CTPA) may be accurate methods for the detection of CTEPH, with ... scan and specific diagnostic signs for CTEPH seen by multidetector computed tomography angiography (MDCT), magnetic resonance ...
Another technique is digital subtraction angiography which allows verification of the diagnosis and endovascular treatment in a ... Angiography provides important information regarding the perfusion and patency of distal arteries (e.g. femoral artery). The ... However, angiography should only be used if symptoms warrant surgical intervention. Treatment involves revascularization ...
The position of the correct artery or vein supplying the pathology in question is located by digital subtraction angiography ( ...
... with professors Michel Tonnelier and Francis Besse and helped them with the development of digital subtraction angiography. Dr ... Following it, he did residency in diagnostic radiology as well as in angiography and interventional radiology at the Centre ...
Techniques such as conventional digital subtraction angiography (DSA) and magnetic resonance imaging (MRI) are used to find and ... Cerebral angiography and magnetic resonance imaging, family medical history, symptoms, a complete physical examination, and ...
Digital subtraction angiography (DSA) is a two-dimensional imaging technique for the visualization of blood vessels in the ... "Current Status of Digital Angiography in Vascular Imaging". Radiologic Clinics of North America. 33 (1): 1-14. PMID 7824692. " ... Rotational angiography is a technique to acquire CT-like 3D images intraoperatively with a fixed C-Arm. To do that, the C-Arm ... Rotational angiography visualizes the bronchial tree in 3D during the procedure. The air thereby serves as a 'natural' contrast ...
The services provided at hospitals are X-Ray and Ultrasound, MRI, CT scan, Digital Subtraction Angiography, Colour Doppler ...
... digital subtraction angiography, and new technologies. An additional focus is that of contrast media research, primarily for ...
Digital subtraction angiography (DSA), magnetic resonance angiography (MRA), and CT angiography (CTA) are confirmatory imaging ...
... comparison with intraarterial digital subtraction angiography". World Journal of Surgery. 27 (3): 278-83. doi:10.1007/s00268- ... with contrast-enhanced three-dimensional fast imaging with steady-state precession magnetic resonance angiography: ...
... or digital subtraction angiography (DSA) may be necessary. MRI is particularly useful as it can differentiate between cytotoxic ... However, CT scan can be limited in determining the exact cause of cerebral edema in which cases, CT angiography (CTA), MRI, ...
Angiography: Sometimes referred to as traditional angiography, catheter angiography or digital subtraction angiography (DSA.) A ... Plaque and blood flow can be evaluated using ultrasound, CT Angiography, MR angiography and catheter based angiography to ... created may be modified by computer to better visualize the structures as is in the case with digital subtraction angiography, ... Angiography provides the basis for all endovascular therapy. Balloon Angiography: The foundational IR procedure. Small balloons ...
Charles Mistretta in 1979 invented digital subtraction angiography (DSA), the technique currently in use. It consists of ... Diagnostic angiography Cerebral angiography was developed by Portuguese neurologist Egas Moniz at the University of Lisbon, in ... He performed the first brain angiography in Lisbon in 1927 by injecting an iodinated contrast medium into the internal carotid ... In 1964, the Norwegian radiologist Per Amudsen was the first to perform a complete brain angiography with a transfemoral ...
... an upcoming package announced by the European Commission Digital subtraction angiography, a fluoroscopy technique Distinguished ... US Digital Signature Algorithm, a cryptographic standard for digital signatures Directory System Agent, an IT standard, part of ... a per diem contribution for UNDP staff members Dental surgery assistant Digital Services Act, ...
MRI scans of the brain and orbit with and without contrast, magnetic resonance angiography or digital subtraction angiography ...
... to diagnose myocardial infarction Arteriography of the affected extremity or organ Digital subtraction angiography is useful in ...
... digital subtraction angiography) of carotid artery to see the extension of tumors and feeding vessels[citation needed] Antro- ...
... comparison with intraarterial digital subtraction angiography". World Journal of Surgery. 27 (3): 278-83. doi:10.1007/s00268- ... with contrast-enhanced three-dimensional fast imaging with steady-state precession magnetic resonance angiography: ...
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 ... Grier, D.J.; Watson, L.J.; Hartnell, G.G.; Wilde, P. (1993). "Are routine chest radiographs prior to angiography of any value ...
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 ... A recent trend in the United States is the stand-alone day angiography facility associated with a private vascular surgery ... Arterial and venous disease treatment by angiography, stenting, and non-operative varicose vein treatment sclerotherapy, ...
Angiography. *Digital subtraction angiography *Cerebral angiography. *Aortography. *Fluorescein angiography. *Radionuclide ...
... comparison with intraarterial digital subtraction angiography. World J Surg. 2003, 27 (3): 278-83. PMID 12607051. doi:10.1007/ ... with contrast-enhanced three-dimensional fast imaging with steady-state precession magnetic resonance angiography: ...
Major complications in cerebral angiography such as in digital subtraction angiography or contrast MRI are also rare but ... If digital subtraction angiography is used instead, the risks are considerably reduced because the catheter does not need to be ... For all structures except the heart, the images are usually taken using a technique called digital subtraction angiography or ... Another increasingly common angiographic procedure is neuro-vascular digital subtraction angiography in order to visualise the ...
... analog subtraction angiography for the assessment of cardiac structures via video fluoroscopy and the earliest predecessor (The ... Sass, DJ; Nolan, AC; Wood, EH (January 1974). "Digital computer analysis of circulatory and respiratory pressures in water- ... analog subtraction angiography, and eventually the Dynamic Spatial Reconstructor (DSR), a predecessor to modern high speed ... methods for the digital conversion of analog physiologic signals allowing for computer-based monitoring of vascular signals ( ...
With the advent of digital subtraction angiography (DSA) technique in 1980s, CO2 has evolved into a safe and useful alternative ... J. Caridi, I. Hawkins, S. Klioze, R. LeVeen, "Carbon Dioxide Digital Subtraction Angiography: The Practical Approach", ... CO2 angiography is intended only for peripheral procedures. In case of procedures in the arterious system it is allowed to ... Carbon dioxide angiography is a diagnostic radiographic technique in which a carbon dioxide (CO2) based contrast medium is used ...
Lewin, J.M.; Isaacs, P.K.; Vance, V.; Larke, F.J. (2003). "Dual-energy contrast-enhanced digital subtraction mammography: ... "Cervical and cranial computed tomographic angiography with automated bone removal: Dual energy computed tomography versus ... "New contrast media designed for X-ray energy subtraction imaging in digital mammography". Investig. Radiol. 38 (9): 602-608. ... "Physical characterization of a scanning photon counting digital mammography system based on Si-strip detectors". Med. Phys. 34 ...
"Introduction to Digital Subtraction Angiography". The cost effectiveness of digital subtraction angiography in the diagnosis of ... Hence the term "digital subtraction angiography". Subtraction angiography was first described in 1935 and in English sources in ... Intravenous digital subtraction angiography (IV-DSA) is a form of angiography which was first developed in the late 1970s. IV- ... DAlotto C, Pelz DM, Rankin RN (September 1985). "A comparison of angiography, intravenous digital subtraction angiography and ...
... generalized framework for histogram-based similarity measures is presented and applied to the image-enhancement task in digital ... subtraction angiography (DSA). The class of differentiable, strictly... ... L. V. Tran and J. Sklansky, Flexible mask subtraction for digital angiography, IEEE Trans. on Medical Imaging 11 (1992) 407 and ... Buzug T.M., Weese J., Lorenz C., Beil W. (1997) Histogram-based image registration for digital subtraction angiography. In: Del ...
Digital subtraction angiography, whether based on traditional X-ray or MR, suers from patient motion artifacts. Until now, the ... Motion compensated digital subtraction angiography. Hemmendorff, M. Linköping University, Department of Electrical Engineering ... Motion Compensation, Motion Estimation, Digital Subtraction Angiography, Aperture Problem, Pixelshift, Automatic, Quadrature ... time can be significantly reduced in ordinary peripheral angiographies and that the number of retakes due to large or local ...
Digital subtraction angiography definition, a computerized x-ray technique in which arteries are visualized following injection ... digital subtraction angiography. in Medicine. digital subtraction angiography. .css-1khtv86{font-size:20px;color:#c0b5b5;}.css- ... digital subtraction angiography. .css-7w6khc{padding-top:20px;}. .css-1oucjfz{list-style-type:none;line-height:22px;}. *digital ... digital subtraction angiography. .css-1g5b64m{padding:16px 0;}. .css-1fvpz4m{margin-right:32px;outline:none;border:none;padding ...
Digital Subtraction Pulmonary Angiography. Digital subtraction pulmonary angiography (DSPA) is the criterion standard or ... digital subtraction pulmonary angiography (DSPA), pulmonary computed tomography angiography (PCTA), and pulmonary magnetic ... Because digital subtraction pulmonary angiography (DSPA) is perceived to be invasive and requires the use of iodinated contrast ... Pulmonary angiography. Digital subtraction pulmonary angiogram shows splaying of the arterial branches of the right upper lobe ...
Compare risks and benefits of common medications used for Digital Subtraction Angiography. Find the most popular drugs, view ... What is Digital Subtraction Angiography: Digital Subtraction Angiography (DSA) is a type of fluoroscopy technique used in ... Medications to treat Digital Subtraction Angiography. The following list of medications are in some way related to, or used in ... Looking for answers? Ask a question or go join the digital subtraction angiography support group to connect with others who ...
... (DSA) is a technique used in interventional radiology to clearly visualize blood vessels ... Digital Subtraction Angiography (DSA) is a technique used in interventional radiology to clearly visualize blood vessels in a ... It uses material from the Wikipedia article "Digital_subtraction_angiography". A list of authors is available in Wikipedia. ... In traditional angiography images are acquired by exposing an area of interst with time-controlled x-rays while injecting ...
Associations of Angiography, Digital Subtraction with chemical compounds. *Digital subtraction angiography with a gadolinium ... High impact information on Angiography, Digital Subtraction. *Transvenous digital subtraction angiography was used before ... Anatomical context of Angiography, Digital Subtraction. *Associations of Angiography, Digital Subtraction with chemical ... routine and digital subtraction angiography, and phlebography [35].. *A combination of digital subtraction angiography and a ...
Digital subtraction angiography: current clinical applications.. D M Pelz, A J Fox, F Vinuela ... The applications of digital subtraction angiography (DSA) in neurologic diagnosis have been evolving as clinical experience ...
... automatic examination pre-sets support a smooth and efficient workflow in angiography examinations. ... With Philips Digital Subtraction Angiography (DSA) automatic examination pre-sets support a smooth and efficient workflow in ... angiography examinations. To extend flexibility and safety during DSA examinations the CombiDiagnost R90 table is enhanced with ...
For postprocessing of digital subtraction angiography (DSA) series, a newly implemented algorithm of parametric color coding ... Parametric color coding of digital subtraction angiography in the evaluation of carotid cavernous fistulas.. Gölitz P1, ...
Assessment of regional wall motion abnormality without contrast medium by digital subtraction angiography using Fourier ... A quantitative evaluation of left ventricular function by digital subtraction angiography without using contrast medium: Time- ...
Digital subtraction angiography with clinical correlation. The Journal of the American Osteopathic Association, February 1985, ... Osborn R. Digital subtraction angiography with clinical correlation. J Am Osteopath Assoc 1985;85(2):77. doi: 10.7556/jaoa. ... Digital subtraction angiography with clinical correlation You will receive an email whenever this article is corrected, updated ...
... means the sales value of Digital Subtraction Angiography(DSA? This report studies sales (consumption) of Digital Subtraction ... Angiography(DSA)in Europe market, especially in Germany, UK, France, Russia, Italy, Benelux and Spain, focuses on top players ... means the sales volume of Digital Subtraction Angiography(DSA? Revenue, ... 5.3 UK Digital Subtraction Angiography(DSA)Sales and Market Share by Type. 5.4 UK Digital Subtraction Angiography(DSA)Sales and ...
3D digital subtraction angiography image processing apparatus US20050046644A1 (en) * 2003-08-28. 2005-03-03. Satoru Ohishi. 3D ... Rotational digital subtraction angiography phantom Download PDF Info. Publication number. US5712895A. US5712895A US08783503 ... Rotational digital subtraction angiography phantom Applications Claiming Priority (1). Application Number. Priority Date. ... US08783503 1997-01-14 1997-01-14 Rotational digital subtraction angiography phantom Expired - Fee Related US5712895A (en) ...
Comparisons between digital subtraction angiography and conventional angiography have frequently been made in the radiologic ... Intraarterial digital subtraction angiography for definitive diagnosis of intracranial aneurysms.. H Touho, J Karasawa, T ... Intraarterial digital subtraction angiography for definitive diagnosis of intracranial aneurysms.. H Touho, J Karasawa, T ... Intraarterial digital subtraction angiography for definitive diagnosis of intracranial aneurysms.. H Touho, J Karasawa, T ...
It performs better than that reported for single-slice CT angiography. Introduction of eight- and especially 16-row MSCT ... Multislice CT angiography is an accurate and robust noninvasive screening test for intracranial aneurysms. ... angiography will provide further progression through thinner slices, a l … ... a comparison with intraarterial digital subtraction angiography J Neurosurg. 2003 Apr;98(4):828-36. doi: 10.3171/jns.2003.98. ...
Color-Coded Digital Subtraction Angiography: The End of a Monochromatic Era? Message Subject (Your Name) has sent you a message ... Intra-arterial digital subtraction angiography. In: Benndorf G ed. Dural Cavernous Sinus Fistulas: Diagnosis and Endovascular ... Parametric imaging using digital subtraction angiography. Br J Radiol 1986;59:7-11. ... Color-Coded Digital Subtraction Angiography: The End of a Monochromatic Era?. G. Benndorf ...
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Fourteen patients suspected of having Moya Moya disease underwent intravenous digital subtraction angiography (DSA), and the ... Moya moya disease: use of digital subtraction angiography in its diagnosis Radiology. 1985 Oct;157(1):107-11. doi: 10.1148/ ... Fourteen patients suspected of having Moya Moya disease underwent intravenous digital subtraction angiography (DSA), and the ...
A method and system for extracting coronary vessels fluoroscopic image sequences using coronary digital subtraction angiography ... Digital subtraction angiography JP2018501008A (en) * 2015-01-05. 2018-01-18. コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V.. ... Digital subtraction angiography for 3D diagnostic imaging US6154518A (en) * 1996-10-28. 2000-11-28. General Electric Company. ... Digital subtraction angiography for 3D diagnostic imaging US6154518A (en) * 1996-10-28. 2000-11-28. General Electric Company. ...
A framework for spacial-variant thresholding of digital subtraction angiography images Author(s): Nong Sang; Weixue Peng; Heng ... Vessel segmentation is the base of 3d reconstruction of Digital Subtraction Angiograph (DSA) images. This paper proposes a ...
IA-DSA is defined as imaging and intra-arterial digital subtraction angiography rarely. ... IA-DSA stands for imaging and intra-arterial digital subtraction angiography. ... How is imaging and intra-arterial digital subtraction angiography abbreviated? ... arterial-digital-subtraction-angiography-(IA_DSA).html,IA-DSA,/a,. Citations. *MLA style: "IA-DSA." Acronym Attic. 2018. ...
intra-arterial digital subtraction angiography 的翻译结果:动脉数字减影血管造影;动脉法数字减 ... intra-arterial digital subtraction angiography. Non-selective intra-arterial digital subtraction angiography for the assessment ... MR angiography versus intra-arterial digital subtraction angiography of the lower extremities: activity-based cost analysis ... We compared magnetic resonance angiography(MRA)and intra-arterial digital subtraction angiography(IA-DSA)in 20
Digital subtraction angiography of the head and neck: experience in a community hospital over a 9-month period. The Journal of ... Digital subtraction angiography of the head and neck: experience in a community hospital over a 9-month period ... Digital subtraction angiography of the head and neck: experience in a community hospital over a 9-month period ... Stoecker R, Lowry B. Digital subtraction angiography of the head and neck: experience in a community hospital over a 9-month ...
... reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. Digital subtraction ... Key words: Angiography, digital subtraction; Gadolinium; Magnetic resonance angiography; Renal artery obstruction; Sensitivity ... Records of patients who underwent magnetic resonance angiography as well as digital subtraction angiography for assessment of ... Gadolinium-enhanced magnetic resonance angiography in renal artery stenosis: comparison with digital subtraction angiography ...
Digital subtraction angiography (DSA) with intravenous contrast injection was performed on 500 consecutive adult patients and ... The significance of internal carotid artery occlusion shown by i.v. digital subtraction angiography.. *J H Warwick Pexman, C H ... Improvement of cervicocranial i.v. digital subtraction angiography with pixel remasking and cardiac gating.. *J H Warwick ... Digital subtraction angiography (DSA) with intravenous contrast injection was performed on 500 consecutive adult patients and ...
Comparing computed tomography (CT) angiography versus digital subtraction angiography for the screening of traumatic ... Digital subtraction angiography (DSA) has been the gold standard for diagnosing traumatic pseudoaneurysms. Its use as a ... One traumatic pseudoaneurysm was missed on computed tomography angiography (CTA) because of a poor quality scan. The average ...
... computed tomography-digital subtraction angiography correlations - Il Giornale Italiano di Radiologia Medica 2019 Maggio-Giugno ... Anatomical variants of the arterial vascularization of the liver: computed tomography-digital subtraction angiography ... computed tomography-digital subtraction angiography correlations. G Ital Radiol Med 2019;6:268-74. DOI: 10.23736/S2283-8376.19. ... variants that are possible and it is the objective of this article to classify them using digital subtraction angiography and ...
... angiography with conventional digital subtraction angiography (DSA) as the reference standard in the assessment of aortoiliac ... angiography with conventional digital subtraction angiography (DSA) as the reference standard in the assessment of aortoiliac ... Aortoiliac and lower extremity arteries assessed with 16-detector row CT angiography: prospective comparison with digital ... prospective comparison with digital subtraction angiography. Radiology, 236(3):1083-93. ...
  • Multidetector CT angiography of the aortoiliac system and lower extremities: a prospective comparison with digital subtraction angiography ," American Journal of Roentgenology, vol. (thefreedictionary.com)
  • Banaei A, Norouzi R, Abedi Firouzjah R, Elahi M. Evaluation and Assessment of Doppler Ultrasonography Results in Comparison with Digital Subtraction Angiography in Diagnosis of Internal Carotid Artery Stenosis. (ac.ir)
  • The cost effectiveness of digital subtraction angiography in the diagnosis of cerebrovascular disease (PDF). (wikipedia.org)
  • The applications of digital subtraction angiography (DSA) in neurologic diagnosis have been evolving as clinical experience with this technology accumulates. (ahajournals.org)
  • Intraarterial digital subtraction angiography for definitive diagnosis of intracranial aneurysms. (ajnr.org)
  • Magnification radiography and stereography using intraarterial digital subtraction angiography were done to obtain a more precise diagnosis. (ajnr.org)
  • Important advantages of intraarterial digital subtraction angiography include reduced procedural time and decreased contrast agent burden, factors that will ensure broader application of this procedure for definitive diagnosis of intracranial aneurysms as experience with the technique accumulates. (ajnr.org)
  • CT angiography with Digital subtraction angiography is the gold standard in the diagnosis but venous colour Doppler ultrasound study is also useful for the diagnosis of venous aneurysm. (thefreedictionary.com)
  • Diagnosis of intracranial aneurysms: accuracy of MR angiography at 0.5 T. (semanticscholar.org)
  • The gold standard for the diagnosis of CVS is digital subtraction angiography (DSA), but the utility for routine screening with DSA during the early course of aSAH is unclear. (heart.org)
  • In the present study, we discuss the accuracy of digital subtraction angiography (DSA) in diagnosis of thrombus in the common carotid artery and its role in the medical management of this disorder. (clinicalimagingscience.org)
  • This review aims to review the literature on coronary CT scanning and digital subtraction angiography, their clinical applications, techniques and comparative value in coronary artery assessment and diagnosis. (essaysamurai.co.uk)
  • Rapid diagnosis of thoracic aortic transection using intravenous digital subtraction angiography. (readabstracts.com)
  • Twenty years later, intra-arterial digital subtraction angiography (DSA) not only still exists but also has become an indispensable imaging technique for endovascular treatment (EVT) methods that have largely replaced surgical techniques for vascular disorders. (ajnr.org)
  • The experience of use of intra-arterial digital subtraction angiography (IADSA) was reported, on 100 cases with intracranial diseases. (cnki.net)
  • We compared magnetic resonance angiography(MRA)and intra-arterial digital subtraction angiography (IA-DSA)in 20 cases with intracranial aneurysms. (cnki.net)
  • 20 cases underwent intra-arterial digital subtraction angiography (DSA) within a week of CTA examination. (cnki.net)
  • Intra-arterial digital subtraction angiography of vascular lesions of the spinal cord. (cnki.net)
  • Follow-up intra-arterial digital subtraction angiography in 25 patients at a mean follow-up period of 13.1 months (range 3-29 months) showed restenosis in 5/36 (13.9%) lesions which could be successfully redilated. (cnki.net)
  • In this study, we aimed to clarify the incidence of co-existing vascular abnormalities, especially unruptured cerebral aneurysms by reviewing selective intra-arterial digital subtraction angiography (DSA) images in PICH patients. (cnki.net)
  • In order to evaluate the sensitivity and specificity of magnetic resonance angiography (MRA) in spontaneous subarachnoid haemorrhage, 14 patients with recent haemorrhage verified by CT or lumbar puncture were investigated with both selective intra-arterial digital subtraction angiography (IA-DSA) and MRA by two independent teams, each having the same preangiographic information. (semanticscholar.org)
  • In 1927, Egaz Moniz 1 , 2 introduced cerebral angiography by using the x-ray absorption of intravascular contrast. (ajnr.org)
  • Providing superior spatial resolution for vascular imaging that was continuously increased with time, conventional angiography has played a major role in diagnosing steno-occlusive diseases in cerebral, coronary, and peripheral vascular territories. (ajnr.org)
  • Mainly due to the inherent invasiveness and the potential risks of intra-arterial catheterization and contrast injections causing permanent neurologic deficits, those proponents of less "dangerous" vascular imaging loudly prophesized the near end of cerebral angiography as diagnostic tool. (ajnr.org)
  • Need help in choosing the right cerebral digital subtraction angiography dsa hospital? (credihealth.com)
  • Get detailed info on services & amenities, accreditations, doctors and other credentials of top hospitals for cerebral-digital-subtraction-angiography-dsa in Mumbai. (credihealth.com)
  • Check OPD schedule of doctors and book appointment online top hospitals for cerebral-digital-subtraction-angiography-dsa in Mumbai. (credihealth.com)
  • Comparison of hand injection with mechanical injection for digital subtraction selective cerebral angiography. (openrepository.com)
  • 100 patients undergoing digital subtraction cerebral angiography were randomized to have contrast delivered by either hand or mechanical injection. (openrepository.com)
  • However, radiation exposure to the radiologist's hand and body were reduced by up to 70% by using a mechanical injector for contrast delivery during selective cerebral angiography with digital subtraction. (openrepository.com)
  • BACKGROUND: Computed tomographic angiography (CTA) has recently emerged as a non-invasive alternative to digital subtraction angiography (DSA) for the detection of residual cerebral aneurysms (RA). (lvhn.org)
  • The Chinese Cerebral Aneurysms Survey is a continuing prospective study to evaluate the effectiveness of unenhanced, three-dimensional time-of-flight magnetic resonance angiography (3D-TOF-MRA) with volume rendering (VR) at 3-T in the detection of intracranial aneurysms. (clinicaltrials.gov)
  • The first author (Y.K.) has developed a method to obtain a thorough understanding of the anatomical relationships of a middle cerebral artery (MCA) aneurysm as follows: the anteroposterior view is obtained with a three-dimensional (3D) digital subtraction angiography (3D-DSA) or 3D computed tomography angiography (3D-CTA). (scientificscholar.in)
  • During nonselective angiography, with the mouth closed, there was strong sequential opacification of the external carotid arteries, maxillary arteries, maxillary retia mirabilia, cerebral arterial circle, and basilar artery. (avmi.net)
  • X-ray−based catheter angiography has, for a long time, been the dominant diagnostic tool for vascular lesions in the human body. (ajnr.org)
  • Although digital subtraction angiography (DSA) is the gold standard for detecting arterial vascular injury, it is an invasive procedure with potential complications, such as puncture-site haematoma, iatrogenic vascular damage and embolic complications, including stroke. (scielo.org.za)
  • Background The precise understanding of the angioarchitecture of spinal vascular malformations (SVMs) is often difficult to reach with conventional digital subtraction angiography (DSA). (bmj.com)
  • Time-resolved three-dimensional (3D) digital subtraction angiography (DSA)- i.e. , four-dimensional (4D)-DSA-is a recently developed angiographic imaging modality that can provide quantitative information on blood flow within a 3D vascular volume [ 1 ]. (springeropen.com)
  • An anteroposterior digital subtraction image shows a simultaneous epidural and vascular contrast pattern ( Figure 1 B ). Therefore, after redirecting block needle and injecting contrast, we checked the epidurogram without intravascular pattern. (anesthpain.com)
  • A tailored approach for evaluating patients with peripheral vascular disease has been developed using intravenous digital subtraction angiography (IV DSA). (elsevier.com)
  • One hundred patients with ocular occlusive vascular disease were studied by intravenous digital subtraction angiodraphy (IV DSA). (jamanetwork.com)
  • Angiography of the vascular system of the brain. (tabers.com)
  • abstract = "The television camera comprises an important link in the imaging chain of digital subtraction angiography equipment. (elsevier.com)
  • abstract = "Digital subtraction angiography through the central artery of the ear was performed to show elastase-induced aneurysms in 34 rabbits. (elsevier.com)
  • Fourteen patients suspected of having Moya Moya disease underwent intravenous digital subtraction angiography (DSA), and the findings from nine of these patients were reviewed and analyzed. (nih.gov)
  • To define the exact incidence of late degeneration, 32 patients underwent intravenous digital subtraction angiography (IVDSA) and/or a Duplex scan more than 3 years after human umbilical vein (HUV) grafting. (kuleuven.be)
  • 3D-DSA or 3D computed tomography angiography images visualizing the neck of the aneurysm should be obtained in combination with images obtained from the standard oblique angle. (scientificscholar.in)
  • It is being replaced by computed tomography angiography (CTA), which can produce 3D images through a test which is less invasive and stressful for the patient, and magnetic resonance angiography (MRA), which avoids X-rays and nephrotoxic contrast agents. (wikipedia.org)
  • Radiologic modalities used for assessment include lung scintigraphy, digital subtraction pulmonary angiography (DSPA), pulmonary computed tomography angiography (PCTA), and pulmonary magnetic resonance angiography (PMRA). (medscape.com)
  • To evaluate the accuracy of gadolinium-enhanced magnetic resonance angiography in assessing renal artery stenosis compared to catheter digital subtraction angiography. (hkmj.org)
  • Records of patients who underwent magnetic resonance angiography as well as digital subtraction angiography for assessment of renal artery stenosis from January 2003 to December 2005 were reviewed. (hkmj.org)
  • Each of the two experienced interventional and body magnetic resonance radiologists, who were blinded to the results, reviewed the digital subtraction angiography and magnetic resonance angiography images respectively. (hkmj.org)
  • One of the arteries was previously stented and could not be assessed with magnetic resonance angiography due to severe artefacts. (hkmj.org)
  • magnetic resonance angiography overestimated the degree of stenosis in 8% and underestimated it in 3% of them. (hkmj.org)
  • Our experience suggested that gadolinium-enhanced magnetic resonance angiography is a sensitive non-invasive modality useful in the assessment of clinically significant renal artery stenosis. (hkmj.org)
  • 8.) Paul J Nederkoorn, Yolanda Vander Graff, Myriam Hunink MG: Duplex ultrasound and magnetic resonance angiography compared with digital subtraction angiography in carotid artery stenosis: A Systematic Review: Stroke 2003;34:1324-1332. (thefreedictionary.com)
  • Traditionally magnetic resonance angiography (MRA) of the carotid arteries has been performed with time-of-flight (TOF) methods, which are limited by flow related artifacts. (iospress.com)
  • Contrast enhanced MRA using an intravenously administered gadolinium agent can overcome the limitations of TOF MR A. One contrast enhanced MRA method, projection magnetic resonance digital subtraction angiograph (MRDSA), generates time-resolved angiograms in a manner similar to conventional digital x-ray digital subtraction angiography. (iospress.com)
  • HlthRes-DB also contains indicators on the availability of the following medical equipment: computed tomography (CT) scanners, magnetic resonance imaging (MRI) units, positron emission tomography (PET) scanners, gamma cameras, digital subtraction angiography units, mammographs, radiation therapy equipment and lithotriptors. (who.int)
  • Types include magnetic resonance angiography, interventional radiology, and computed tomography. (tabers.com)
  • Digital subtraction angiography (DSA) is a fluoroscopy technique used in interventional radiology to clearly visualize blood vessels in a bony or dense soft tissue environment. (wikipedia.org)
  • However, a recent study has suggested limitations to DSA because of associated fatal complications despite the absence of intravascular injection in digital subtraction fluoroscopy ( 4 ). (anesthpain.com)
  • Main mechanical parts: tube stand, examination table, grid for removing scattered photons (Bucky), X-ray detector: cassette with radiographic film and adjacent fluorescent screens (in radiography) or image intensifier (both on the way out) or flat panel digital detector (in fluoroscopy). (scribd.com)
  • The focus extends from general radiography through fluoroscopy to 3D angiography as applied in general hospitals and clinics. (wikibooks.org)
  • Compared with conventional DSA, the sensitivity and specificity of 16-detector row CT angiography with regard to detection of hemodynamically significant stenosis in all 35 arterial segments were 96% and 97%, respectively, for both readers. (uzh.ch)
  • Digital subtraction angiography showing severe long segment stenosis of right-side iliofemoral arteries. (thefreedictionary.com)
  • Digital Subtraction Angiography (DSA) is the standard method for detection of carotid artery stenosis. (ac.ir)
  • Preoperative evaluation of carotid artery stenosis: comparison of contrast-enhanced MR angiography and duplex sonography with digital subtraction angiography. (unil.ch)
  • Digital subtraction angiography with intravenous injection: assessment of 1,000 carotid bifurcations. (semanticscholar.org)
  • PURPOSE: To prospectively compare the accuracy of 16-detector row computed tomographic (CT) angiography with conventional digital subtraction angiography (DSA) as the reference standard in the assessment of aortoiliac and lower extremity arteries in patients with peripheral arterial disease. (uzh.ch)
  • CONCLUSION: Sixteen-detector row CT angiography is an accurate and reliable noninvasive alternative to conventional DSA in the assessment of aortoiliac and lower extremity arteries in patients with peripheral arterial disease. (uzh.ch)
  • Postoperative assessment of clipped aneurysms with 64-slice computerized tomography angiography. (semanticscholar.org)
  • Digital Radiography heralds a new era for medical X-ray imaging. (wikibooks.org)
  • A printable version of Basic Physics of Digital Radiography is available. (wikibooks.org)
  • Microangiography (/ˌmaɪkroʊˌændʒiˈɒɡrəfi/ MY-kro-AN-jee-OG-rə-fee) is a type of angiography that consists of the radiography of small blood or lymphatic vessels of an organ. (wikipedia.org)
  • Intravenous digital subtraction angiography (IV-DSA) is a form of angiography which was first developed in the late 1970s. (wikipedia.org)
  • Intravenous digital subtraction angiography (DSA) of the extracranial and intracranial carotid and vertebral artery circulations. (bvsalud.org)
  • I've just come falling back from my dr and ardor he has prescribed Optiray 160 for direct intravenous digital subtraction coronary angiography. (azithromycinonline.com)
  • It is possible that another angiographic approach, intravenous digital subtraction angiography (IVDSA), could enhance the speed of this screening process. (readabstracts.com)
  • It is used as the preferred alternative to invasive pulmonary angiography (which is accurate but requires right ventricular catheterization), or to ventilation/perfusion scanning of the lungs (which often yields indeterminate results). (tabers.com)
  • In traditional angiography, images are acquired by exposing an area of interest with time-controlled x-rays while injecting contrast medium into the blood vessels. (wikipedia.org)
  • Visibility of the blood vessels is enhanced by the subtraction of digital TV images taken at different times--one image is taken when the blood is opacified with contrast media (called the contrast or dye image) and the second image is taken when the blood is not opacified (called the mask image). (google.com)
  • Fifty consecutive adult patients, who successively underwent MSCT angiography (four rows) and IADS angiography of intracranial vessels, were prospectively identified. (nih.gov)
  • A method and system for extracting coronary vessels fluoroscopic image sequences using coronary digital subtraction angiography (DSA) are disclosed. (google.com)
  • digital subtraction angiography radiographic visualization of blood vessels, with images produced by subtracting background structures and enhancing the contrast of those areas that change in density between a preliminary "mask" image and subsequent images. (thefreedictionary.com)
  • Digital subtraction angiography is an x-ray based imaging technique for studying the blood vessels. (trinitymedcenter.com)
  • Digital subtraction angiography is an examination that provides images of the lumen (inner surface) of the blood vessels including the arteries, veins and the heart chambers. (gleneagles.com.sg)
  • Digital subtraction angiography (DSA) is a radiological technique that can be used to clearly visualize the blood vessels from surrounding bones or dense soft tissues. (scienceopen.com)
  • The CAAS platform offers software packages for quantitative X-ray angiography image analysis with a complete range of tools allowing the performing of accurate and reproducible measurements of the dimensions of coronary arteries, peripheral blood vessels as well as left and right ventricles. (esaote.com)
  • ISMRM 2013) High Resolution, Non-Contrast-Enhanced MR-Angiography of Pedal Vessels. (ismrm.org)
  • One cause of the high death rate is the length of time required for conventional biplane angiography, a method of viewing the blood vessels under X-ray, to evaluate the thoracic aorta. (readabstracts.com)
  • While most other types of angiography cannot produce images of vessels smaller than 200 µm in diameter, microangiography does just that. (wikipedia.org)
  • Laser Doppler imaging by holography provides high-contrast visualization of local blood flow in choroidal vessels in humans, with a spatial resolution comparable to state-of-the-art indocyanine green angiography. (wikipedia.org)
  • This was evaluated by studying 50 patients who underwent IVDSA and conventional biplane angiography. (readabstracts.com)
  • With the progress of imaging techniques, noninvasive or minimally invasive methods like the CT angiography, MR angiography and ultrasonography with Doppler or Duplex mode were applicable. (ac.ir)
  • Digital subtraction angiography (DSA) again works by introducing a contrast agent into the coronary arteries and taking x-rays in real time, however a pre image is taken by x-ray. (essaysamurai.co.uk)
  • Angiography of the heart and coronary arteries. (tabers.com)
  • Angiography for the determination of visible blockages in the coronary arteries with noninvasive CT scanning instead of coronary catheterization. (tabers.com)
  • Angiography of the coronary arteries to determine any pathological obstructions to blood flow to the heart muscle. (tabers.com)
  • The goal of this study was to assess the diagnostic accuracy of computerized tomography (CT) angiography performed with the aid of multislice technology (MSCT angiography) in the investigation of intracranial aneurysms, by comparing this method with intraarterial digital subtraction (IADS) angiography. (nih.gov)
  • Multislice CT angiography is an accurate and robust noninvasive screening test for intracranial aneurysms. (nih.gov)
  • Intracranial aneurysms: evaluation by MR angiography. (semanticscholar.org)
  • A. Viergever, Fast rubber sheet masking for digital subtraction angiography , SPIE 1137 Science and Engineering of Medical Imaging (1989) 22. (springer.com)
  • Improvement of cervicocranial i.v. digital subtraction angiography with pixel remasking and cardiac gating. (semanticscholar.org)
  • In our study, only images from corresponding moments in the cardiac cycle before and after contrast injection were matched for subtraction, that is, the concept of apparent cardiac arrest. (uu.nl)
  • A combination of the application of the concept of apparent cardiac arrest with the subtraction technique in 12 patients resulted in good quality images. (uu.nl)
  • This review looked at the techniques of cardiac computed tomography scanning and cardiac digital subtraction angiography, and their contribution to the investigation of coronary artery disease. (essaysamurai.co.uk)
  • The research shows mixed evidence for cardiac computed tomography angiography as a test of high specificity, however sensitivity and specificity of cardiac digital subtraction angiography is high, and therefore suggest that the techniques may be useful in low risk patients. (essaysamurai.co.uk)
  • Conclusion: Carboangiographic study combined to digital subtraction angiography can clear some diagnostic problems and is further method to assess the outcome of angiographic interventional procedures in oncology. (elsevier.com)
  • With the advances in technology, there are now various diagnostic tests available to assess coronary artery disease, including coronary angiography and computed tomography (CT) scanning (Gorenoi, Schonermark & Hagen, 2012). (essaysamurai.co.uk)
  • Coronary angiography is the conventional diagnostic procedure used in coronary artery disease. (essaysamurai.co.uk)
  • After the introduction and rapid progress of cross-sectional imaging methods, such as CT angiography, MR angiography, and Doppler sonography in the late 80s and early 90s, many radiologists believed that these noninvasive methods would soon completely replace intra-arterial angiography. (ajnr.org)
  • While digital subtraction angiography (DSA) is still viewed as the gold standard in carotid imaging, noninvasive imaging methods, including resonance angiography (MRA), computed tomography angiography (CTA), and ultrasonography, play an increasing role in the evaluation of carotid artery disease. (thefreedictionary.com)
  • Computed tomographic angiography versus digital subtraction angiograph" by Nikhil Gautam Thaker, Jay D. Turner et al. (lvhn.org)
  • Computed tomographic angiography versus digital subtraction angiography for the postoperative detection of residual aneurysms: a single-institution series and meta-analysis. (lvhn.org)
  • Computed tomographic scans and digital subtraction angiograms in these 97 patients were retrospectively reviewed in consensus by two interventional radiologists. (snu.ac.kr)
  • Digital subtraction angiography (DSA) with intravenous contrast injection was performed on 500 consecutive adult patients and evaluated for image quality of the carotid artery bifurcations. (semanticscholar.org)
  • subtraction of images made before and after contrast injection removes structures not enhanced by the contrast medium . (thefreedictionary.com)
  • images made before and after contrast injection allow subtraction (separation and removal) of opacities not enhanced by the contrast medium Other image-processing can be performed. (thefreedictionary.com)
  • Several studies have reported that the use of digital subtraction angiography (DSA) increases the detection rate of the intravascular injection frequencies ( 1 - 3 ). (anesthpain.com)
  • Subtraction angiography was first described in 1935 and in English sources in 1962 as a manual technique. (wikipedia.org)
  • Although it is a century-old technique, surprisingly the potential of serial conventional angiography appears still not fully explored. (ajnr.org)
  • Digital subtraction angiography of the extremities using step-translation technique]. (docphin.com)
  • Biederer J, Link J, Stolley C, Heller M. [Digital subtraction angiography of the extremities using step-translation technique]. (docphin.com)
  • To assess the sensitivity and specificity of CTA versus digital subtraction angiography (DSA) in detecting arterial injury and secondarily evaluate the ability of CT to assess non-arterial injury. (scielo.org.za)
  • It will be appreciated, however, that the invention will also find application in other rotational angiography systems, and the like. (google.com)
  • Ikeda H, Shibao K, Ohkita Y, Sugi K, Koga Y, Utsu F, Toshima H (1985) A quantitative evaluation of left ventricular function by digital subtraction angiography without using contrast medium: Time-activity curve and Fourier analysis (in Japanese). (springer.com)
  • Purpose: To compare the efficiency of gadolinium-enhanced 3D MR imaging and digital subtraction angiography (DSA) for detection and characterization of HCCs. (ismrm.org)
  • Effective radiation dose was lower for 16-detector row CT angiography (1.6-3.9 mSv) than for conventional DSA (6.4-16.0 mSv). (uzh.ch)
  • We advocate use of the mechanical injector by radiologists who perform regular angiography to reduce their exposure to radiation. (openrepository.com)
  • Background: The main aim of this study was to find out what is the risk caused by ionizing radiation during digital subtraction angiography (DSA) for abdominal aorta and lower limb examinations. (edu.pl)
  • In those patients with Behçet's disease who have unexplained headaches, papilledema, and elevated cerebrospinal fluid pressure, venous digital subtraction angiography is an expedient, accurate, and safe procedure for demonstrating intracranial venous thrombosis. (elsevier.com)
  • Medical records for 15 patients who underwent rotational three-dimensional (3D) digital subtraction angiography (3D-DSA) before the clipping surgery were analyzed after the surgery. (scientificscholar.in)
  • The angiography also provides a visual guide for interventional procedures needed to re-open blocked arteries such as angioplasty, arterial stent, nephrostomy, and biliary procedures. (gleneagles.com.sg)
  • however, 2 mm stood as the cutoff size below which the sensitivity of MSCT angiography was statistically lower. (nih.gov)
  • Digital subtraction angiography: current clinical applications. (ahajournals.org)
  • Twenty-five patients who had undergone digital subtraction angiography (DSA) and VWMRI studies from September 2016 to September 2017 were included, resulting in 22 patients with 25 IAs, 9 with and 16 without AWE. (thejns.org)
  • Irfan A, Weir G (2016) Hepatic Arterial Mapping by CT Angiography, Cone Beam CT and Digital Subtraction Angiography. (medcraveonline.com)
  • When planning the treatment of patients with Hepatocellular carcinoma that require surgery or endovascular therapy, it is useful to consider the variety of anatomical variants that are possible and it is the objective of this article to classify them using digital subtraction angiography and CT. (minervamedica.it)
  • Comparisons between digital subtraction angiography and conventional angiography have frequently been made in the radiologic literature, and the high quality and several advantages of the former have been reported. (ajnr.org)
  • Park S K, Choi Y S. Advantages of Digital Subtraction Angiography During Nerve Block, Anesth Pain Med. (anesthpain.com)
  • This study was undertaken to evaluate the possible use of digital subtraction applied after selective coronary arteriography. (uu.nl)
  • Negative CT angiography findings in patients with spontaneous subarachnoid hemorrhage: When is digital subtraction angiography still needed? (elsevier.com)