contrast medium

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 [me´de-um] (pl. mediums, me´dia) (L.)
1. an agent by which something is accomplished or an impulse is transmitted.
3. a preparation used in treating histologic specimens.
contrast medium a radiopaque substance used in radiography to permit visualization of body structures. Called also contrast agent.
culture medium a substance or preparation used to support the growth of microorganisms or other cells; called also medium.
dioptric media refracting media.
disperse medium dispersive m.
dispersion medium dispersive m.
dispersive medium the continuous phase of a colloid system; the medium in which the particles of the disperse phase are distributed, corresponding to the solvent in a true solution.
refracting media the transparent tissues and fluid in the eye through which light rays pass and by which they are refracted and brought to a focus on the retina.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

con·trast me·di·um

any internally administered substance that has a different opacity from soft tissue on radiography or computed tomography; includes barium, used to opacify parts of the gastrointestinal tract; water-soluble iodinated compounds, used to opacify blood vessels or the genitourinary tract; may refer to air occurring naturally or introduced into the body; also, paramagnetic substances used in magnetic resonance imaging.
Farlex Partner Medical Dictionary © Farlex 2012

contrast medium

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

contrast medium

Contrast, contrast agent Imaging A substance with a density–eg, a dye or signal differing from that of the organ or structure being imaged, which allows delineation of contour abnormalities; CMs that are more radiopaque–eg with barium or iodine—than the organ or structure being analyzed are known as positive CM, while those that are less radiopaque–eg, with air, are known as negative CM. See Radiopaque contrast.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

con·trast me·di·um

(kon'trast mē'dē-ŭm)
Any internally administered substance that has a different opacity from soft tissue on radiography or computed tomography; used to opacify parts of the gastrointestinal tract, blood vessels, or the genitourinary tract.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

contrast medium

Any substance offering greater resistance to the passage of X rays than soft tissues that can be introduced into a hollow organ so as to outline its interior during radiology. Contrast media include a suspension of a barium salt for the intestine (barium meal or enema) and iodine-containing fluids for the blood vessels and urinary tract.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Contrast medium

A chemical substance used to make an organ or body part opaque on x ray.
Mentioned in: Hysterosonography
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about contrast medium

Q. Has anyone had an allergic reaction to gadolinium dye, MRI contrast agents, I have had a severe reaction. I would like to know the long term effects of this dye. And if anyone else has had or heard of problems and reactions to it. Please answer me. Thank you

A. In 1969 I almost died from the IVP dye. I had no idea I was allergic and when I awoke I was in a "recovery room." The doctor told me to always tell any physicians/paramedics etc of my allergy status regarding the dye. I now have chronic back pain, have a history of cancer in the family and the doctor wants to do a scan (including dye) but when I emphasized that I was allergic he backed off. Now I am wondering if there is anything else that can be done to test the bone (scan) without the dye. Any answers? Thanks

More discussions about contrast medium
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References in periodicals archive ?
The global contrast media agents market is expected to reach US$ 6,860.6 Mn in 2027 from US$ 4,855.2 Mn in 2018.
This paper will examine a single centre approach to managing CI-AKI prevention in outpatients with severe kidney disease having a computed tomography (CT) scan with intravenous iodinated contrast media. A small study was undertaken from January 1, 2017 to December 31, 2017 to determine if the strategies undertaken were effective in preventing CIAKI.
Massive oral contrast media aspirations are very rare but can be fatal since only supportive therapeutic measures are available.
Croffie et al., "ASGE technology status evaluation report: radiographic contrast media used in ERCP," Gastrointestinal Endoscopy, vol.
Puncture of the balloon catheter alone may be sufficient for retrieval through the sheath; however, aspiration of contrast media with the syringe facilitates balloon deflation and may be beneficial.
In the study of Simon et al., it was demonstrated that plasma histamine, complement haemolytic activity, and fibrin split products were changed in patients undergoing radiographic contrast media infusions [12].
Our group is currently investigating new contrast media injection protocols for CT angiography, aiming to develop patient-tailored contrast media injection protocols for low kV and low keV imaging.
In all the quarters, the teat canals were patent and stagnation of contrast media at base of teat in fore quarter and minimal passage of contrast media to caudal aspect of hind quarter confirmed as udder fibrosis.
Browse Contrast Media Injectors Market by Product Type (Computed Tomography Injectors, Magnetic Resonance Injectors, and Vascular Injectors), and Applications (Cardiology, Neurology, Oncology) 2016-2020 report at
The impact of the combination of a reduced tube voltage and iterative reconstruction on iodine dose has been the subject of several studies [7, 9,11,18], but, to our knowledge, this combination has not previously been reported with contrast media iodine concentrations below 300 mg I/mL for a coronary CT angiography protocol, while still providing images of diagnostic quality.