Indicator, Reagent, or Diagnostic Aid
contrast medium
con·trast me·di·um
Subclass of:
Diagnostic Uses of Chemicals
Definitions related to contrast media:
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(contrast agent) Substances administered during imaging procedures that allows delineation of internal structures. Contrast agents appear opaque due to the difference in absorption of X-rays or other electromagnetic waves and surrounding tissue.NCI ThesaurusU.S. National Cancer Institute, 2021
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Substances used in radiography that allow visualization of certain tissues.CRISP ThesaurusNational Institutes of Health, 2006
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Substances used to allow enhanced visualization of tissues.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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(contrast medium) A fluid injected into the bloodstream or swallowed so that organs will show up on x-rays.Harvard Dictionary of Health TermsHarvard Medical Publishing, 2011
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(contrast material) A dye or other substance that helps show abnormal areas inside the body. It is given by injection into a vein, by enema, or by mouth. Contrast material may be used with x-rays, CT scans, MRI, or other imaging tests.NCI Dictionary of Cancer TermsU.S. National Cancer Institute, 2021
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Contrast medium, substance comparatively opaque to X ray, which, when present in an organ or tissue, causes a lighter appearance--i.e., a more definite image--on the X-ray film. Some body structures, such as the lungs, show in X-ray films and in fluoroscopic images by virtue of the sharp difference...Encyclopedia Britannica, Inc., 2020
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