a radiopaque substance injected into a part of the body, as the stomach or duodenum, to provide a contrasting background for the tissues in an x-ray or fluoroscopic examination.
(med) a radiopaque substance, such as barium sulphate, used to increase the contrast of an image in radiography
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.
A substance, such as barium or air, used in radiologic studies to increase the contrast of an image. In x-ray imaging, a positive contrast medium absorbs x-rays more strongly than the tissue or structure being examined; a negative contrast medium, less strongly.
[verb kuh n-trast, kon-trast; noun kon-trast] /verb kənˈtræst, ˈkɒn træst; noun ˈkɒn træst/ verb (used with object) 1. to compare in order to show unlikeness or differences; note the opposite natures, purposes, etc., of: Contrast the political rights of Romans and Greeks. verb (used without object) 2. to exhibit unlikeness on comparison with something else; […]
- Contrast stain
contrast stain n. A dye used to color a portion of a tissue or cell that remained uncolored when the other part was stained by a dye of different color.
[kuh n-tras-tee, kon-tras-] /kənˈtræs ti, ˈkɒn træs-/ adjective, Photography. 1. (of a subject, photograph, or film stock) having or producing a preponderance of dark and light tones with few intermediate shades. /kənˈtrɑːstɪ/ adjective 1. (of a photograph or subject) having sharp gradations in tone, esp between light and dark areas
/ˌkɒntrəsəˈdʒɛstɪbəl/ adjective 1. (psychol) responding or tending to respond to a suggestion by doing or believing the opposite