contrast medium


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Related to contrast medium: contrast material, contrast agent

medium

 [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.

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.

contrast medium

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.

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.

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.

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.

Contrast medium

A chemical substance used to make an organ or body part opaque on x ray.
Mentioned in: Hysterosonography

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
References in periodicals archive ?
Scholars have previously proposed and explored various protocols using fixed abdominal concentration by adjusting contrast medium dose based on body weight.
When decreased renal perfusion flow caused by a contrast medium occurs, patients with impaired left ventricular function have poorer perfusion flow compared to those with normal ventricular function.
In our study urea and creatinine levels were measured 2 and 72 hours after the administration of contrast medium. While measurement at 2 hours may be considered too early the purpose of this time point in the study was to identify any risk for CIN development in the patient so that necessary precautions could be taken as NGAL levels begin to increase after 2 hours2192324 in an acute kidney injury.
Schoepf et al., "Is contrast medium osmolality a causal factor for contrast-induced nephropathy?" BioMed Research International, vol.
Pulmonary and oil embolism after hysterosalpingography with oil soluble contrast medium. Respirology 2004;9:134-136.
In conclusion, our results showed that non ionic low osmolar contrast medium administration led to an increase in MDA levels indicating accelerated oxidant reactions, and a decrease in NO levels in rat kidney tissues.
Iodide mumps after intravascular administration of a nonionic contrast medium: case report and review of the literature.
If a contrast medium is to be used during your CT scan, your doctor will probably ask you not to eat anything for three or four hours or more before the exam.
Acute kidney injury in the critically ill: Is iodinated contrast medium really harmful?
The opacity of iodine to X-rays renders it a suitable compound as a contrast medium. However, due to its toxicity, iodine is not suitable tobe used in its molecular or ionic form.
Tokyo, Japan, Apr 26, 2006 - (JCN) - Meiji Dairies and Kyowa Hakko Kogyo have obtained approval for BOTHDEL Oral Solution, an oral MRI contrast medium for the gastrointestinal tract, from the Ministry of Health, Labor and Welfare.