See Also: digital subtraction angiography(medicine)
angiography, digital subtraction(medicine)
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subtraction(dictionary)
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subtraction technique(medicine)
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MR angiography(medicine)

angiography, digital subtraction (medicine)


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 digitised 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.