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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Medicine) med a radiopaque substance, such as barium sulphate, used to increase the contrast of an image in radiography
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a radiopaque substance introduced into a part of the body to provide a contrasting background for the tissues in an x-ray examination.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||contrast medium - a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills|
medium - (biology) a substance in which specimens are preserved or displayed
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