A radio-opaque dye, or sometimes gas, put into an organ or part of the body so that it will show clearly in an X-ray photograph.
Substance, administered orally, intravenously, or via enema, that is radiopaque when exposed to X rays. The administration of such a compound allows for examination by a radiologist of the tissue or organ being filled.
A liquid or semisolid substance that is radiopaque (meaning it will not allow the passage of X-rays through it); used to make internal structures visible during radiologic examination and on X-ray film.
A substance used in radiography to increase the contrast of an image. The contrast medium can be introduced either in or around the structure. Usually, a contrast medium is a substance through which X rays cannot pass, such as barium. Other commonly used agents are iodine-based mediums for intravenous pyelography, CT scanning (computed tomography scanning), and angiography and gadolinium for MRI (magnetic resonance imaging).
Any substance that is used to improve the visibility of structures during radiography. Barium, given orally or as an enema to show up the alimentary tract on X-ray, is an example of a contrast medium. Air is occasionally useful as a contrast medium; it may be used to displace the cerebrospinal fluid during X-ray examination of the ventricles of the brain.
A material that is used to increase the visibility of the body’s tissues and organs during radiography. A common example is the use of barium which is given by mouth or as an enema to show up the alimentary tract.
In radiology, a substance used to fill hollow organs or blood vessels to highlight their internal structure or distinguish them from neighboring anatomical features. The substance can be radiopaque and positive (e.g., barium sulfate, tri-iodinated media) or radiolucent and negative (e.g., air). Barium sulfate is a commonly used contrast agent for the gastrointestinal tract; it may be swallowed (for upper GI studies) or given as an enema (to visualize the colon).
A contrast agent, which can be a chemical or another substance, is administered into the body to enhance the visualization of structures that would otherwise be difficult to observe on X-ray or other imaging studies.
A contrast medium is a substance that is not penetrable by X-rays and is administered to visualize hollow or fluid-filled areas of the body on X-ray films. Its purpose is to enhance the visibility of these structures for diagnostic purposes. One of the frequently employed contrast media is barium, which aids in highlighting specific areas of interest during X-ray examinations.