digital sub·trac·tion angiography (s b-tr k shn)n. A computer-assisted x-ray technique that subtracts images of bone and soft tissue to permit viewing of the cardiovascular system. |
digital subtraction angiography (DSA),
a method in which radiographic images of blood vessels filled with contrast material are digitized and then subtracted from images obtained before administration of the material. The method increases the contrast between the vessels and the background.
angiography [an″je-og´rah-fe]
radiography of vessels of the body after injection of contrast material; see also arteriography, lymphangiography, and phlebography. Called also vasography.
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.
digital subtraction angiography
Radiology A diagnostic technique that uses video equipment and computers to enhance images obtained with conventional angiography
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