Angiographie, soustraction numérique

Synonym(s) - Digital Subtraction Angiography - Subtraction Angiography, Digital

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.

Broader term(s)

• Diagnosis
• Diagnostic Techniques and Procedures
• Diagnostic Imaging
• Photography
• Image Enhancement
• Radiographic Image Enhancement
• Angiography, Digital Subtraction