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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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