Digital Subtraction Angiography

Definition 1

A technique which subtracts two images that are obtained before and after contrast media is administered to the patient for the purpose of studying blood vessels. (NCI Thesaurus)

Definition 2

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. (NLM, Medical Subject Headings)

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