double-contrast barium enema
a type of x-ray that can be used to help look for colorectal cancer. Barium sulfate, a chalky liquid, is put in through the rectum to partly fill and open up the colon. When the colon is about half-full of barium, air is put in to expand the colon. Abnormal changes in the colon can then show up on x-ray films. Also called DCBE, air-contrast barium enema, or barium enema with air contrast. See also barium enema, colon, colorectal cancer screening, rectum.