Upper gastrointestinal series tract in addition to barium, and this procedure is called double-contrast imaging. In this case the gas is referred to as the negative contrast medium. Traditionally the images produced with barium contrast are made with plain-film radiography, but computed tomography is also used in combination with barium contrast, in which case the procedure is called CT enterography. Various types of barium X-ray examinations are used to examine different parts of the gastrointestinal tract. These include barium swallow, barium meal, barium follow-through, and barium enema. The barium swallow, barium meal, and barium follow-through are together also called an upper gastrointestinal series
American Society of Colon and Rectal Surgeons Accreditation Program for Rectal Cancer. American Society of Colon and Rectal Surgeons The American Society of Colon and Rectal Surgeons (ASCRS), formerly the American Proctologic Society, is a professional society for surgeons specializing in colorectal surgery. It is one of the older surgical societies, having been established in 1899. The organization was established as the American Proctologic Society in 1899, at a meeting held in Columbus, Ohio: The name of the organization was changed to American Society of Colon and Rectal Surgeons in 1973 "to indicate more clearly the scope of its specialty". The ASCRS has described its activities as