Contrast agent

Also found in: Dictionary, Thesaurus, Acronyms.
Related to Contrast agent: Contrast media, Contrast MRI

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 agent

Contrast agent

Also called a contrast medium, this is usually a barium or iodine dye that is injected into the area under investigation. The dye makes the interior body parts more visible on an x-ray film.

Patient discussion about Contrast agent

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 agent
References in periodicals archive ?
Better tumour imaging using nanodiamond-based dual-mode contrast agent
Metal-based contrast agents cost more than sugar-based agents.
Further, since this new MRI contrast agent will substantially improve disease detection by increasing sensitivity and diagnostic confidence, it will enable earlier treatment for many diseases, which is less expensive, and of course more effective for diseases such as cancer," he added.
Increased blood supply to the bowel wall can't be distinguished from a positive contrast agent, as both appear white on a scan.
The FDA has not yet determined whether exposure by patients with kidney failure to gadolinium-containing contrast agents during an MRA test causes NSF.
Some contrast agents carry a small risk of allergic reaction, so it is important to tell the radiologic technologist who will perform your examination if you have any type of allergy.
Through March 1989, there have been a number of articles on the subject, but the indications for the use of the new contrast agents are very ill-defined.
Paramagnetic, macrocyclic gadolinium contrast agent at a concentration 1,0mmol / ml in packs:
Buckyballs may be especially useful for shuttling metal contrast agents through the body for magnetic resonance imaging (MRI) scans, Bolskar says.