Definitions of angiography, digital subtraction

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Definition of 'angiography, digital subtraction'

U.S. National Library of Medicine

1. angiography, digital subtraction
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.

'angiography, digital subtraction' - Nearby Entries
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