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contrast medium


from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A substance, such as barium or air, used in radiography to increase the contrast of an image. A positive contrast medium absorbs x-rays more strongly than the tissue or structure being examined; a negative contrast medium, less strongly.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any substance, such as barium sulfate, used in radiography to increase the visibility of internal structures

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills


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