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Digital subtraction angiography
Digital subtraction angiography (DSA), an electronic
technique for imaging blood vessels, is useful in diagnosing
arterial occlusion, including carotid artery stenosis and
pulmonary artery thrombosis, and in detecting renal vascular
disease. After contrast material is injected into an artery or
vein, a physician produces fluoroscopic images. Using these
digitized images, a computer subtracts the image made
with contrast material from a postinjection image made without
contrast material, producing an image that allows the dye in the
arteries to be seen more clearly. In this manner, the images
arising from soft tissues, bones, and gas are the same in the
initial and subsequent image and are thereby eliminated by the
subtraction process. The remaining images of blood vessels
containing the contrast material are thus more prominent.
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