Double-contrast barium enema bowel. Double-contrast barium enema A double-contrast barium enema is a form of contrast radiography in which x-rays of the colon and rectum are taken using two forms of contrast to make the structures easier to see. A liquid containing barium (that is, a radiocontrast agent) is put into the rectum. Barium is a silver-white metallic compound that outlines the colon and rectum on an x-ray and helps show abnormalities. Air is also put into the rectum and colon to further enhance the x-ray. Double-contrast barium enemas are less invasive than a colonoscopy and have comparatively fewer issues in a viable
Colon (punctuation) a label name followed by a colon. These include C and DOS batch files. For the double colon used in computer programming, see the scope resolution operator, and class member access of C++. The colon is also used as part of the conditional operator in C and other languages. In a number of languages, including JavaScript and Python, colons are used to define name-value pairs in a dictionary or object. The colon is also used in many operating systems commands. It is often used as a single post-fix delimiter, signifying a token keyword had immediately preceded it or the transition