a dye which that may be given to you orally or injected into your hand or arm

a dye that is used to highlight parts of the body that do not ordinarily show up on an x-ray.

Any suitable substance, solid or liquid, applied to a material being radiographed to enhance its radiation contrast in total or in part.

Any material (usually opaque to x-rays) employed to delineate or define a structure during a radiologic procedure.

Substance given to the patient, either through a drink or injection, to help areas of the body show up more clearly during a scan

a dye used to enhance radiological images; often injected intravascularly.

A contrast medium is a radiopaque substance used to facilitate roentgen visualization of internal structures of the body such as the urogenital sinus. A physician might prescribe the ingestion of barium prior to an X-ray investigation of the intestines, with barium acting as a contrast medium to produce a clearer radiograph.