Definitions for "Contrast media"
Comparison in order to distinguish differences. In radiology, the visual differentiability of variations in photographic or film density produced on a radiograph by the structural composition of the object or objects radiographed.
Radio-opaque dye or sometimes gas, put into an organ or a part of the body so that it will show clearly in an x-ray photograph.
are drugs or compounds that block the x-rays and are used to distinguish anatomic structures from surrounding tissues of similar density.