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date: 20 March 2019

digital subtraction 

Concise Medical Dictionary
Elizabeth MartinElizabeth Martin

a radiological technique that enhances visualization of blood vessels (seeangiography). A digitized image is taken before the contrast medium (a ‘mask’) is injected, and this is subtracted by computer from the images taken after contrast injection. Only the blood vessels remain on the image. The technique enables blood-vessel anatomy and blood supply to an organ to be demonstrated more clearly. The quality of the image is very dependent on the patient remaining still, since movement causes severe loss of image (movement ... ...

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