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A member asked:

Are contrast agents in the category of radiopharmaceuticals? don't they emit radiation as well but clearly for diagnosis?

A doctor has provided 1 answer

No: Radio-pharmaceuticals include radiation emitting but short lived isotopes (that break down to non-emitting ones) used for a narrow number of specialized scans. Contrast agents are just materials that block x-rays a different way than the tissues being studied so the radiologist can evaluate the margins/contour of the area under study.

Answered 7/17/2020

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