Definition: 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.
/drug eff /rad eff permitted; do not use /util except by MeSH definition; DF: DS ANGIOGR
Other names Subtraction Angiography, Digital; Digital Subtraction Angiography
