- a radiological technique that enhances X-ray images, most commonly of blood vessels (see angiography). A digitized image is taken before the contrast medium (a ‘mask’) is added, and this is subtracted by computer from the images taken after contrast injection. Only the outline of the blood vessel or other structure containing contrast medium remains on the image. The technique enables blood-vessel anatomy and blood supply to an organ to be demonstrated more clearly. It is very dependent on the patient remaining still, since movement causes severe loss of image (movement artifact). The technique can also be used in nuclear medicine using two different tracers to look for parathyroid gland tumours.
The new mediacal dictionary. 2014.
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digital subtraction angiography — a computerized x ray technique in which arteries are visualized following injection of dye into a vein. Abbr.: DSA * * * … Universalium
digital subtraction angiography — an angiographic technique that produces images by subtracting background structures and enhancing the contrast of those areas that change in density between a preliminary â€œmaskâ€ image and subsequent images … Medical dictionary
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