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
Colon cleansing made by manufacturers and practitioners are based on a flawed understanding of the body. There is little evidence of actual benefit to the procedure, and no evidence that it can alleviate the symptoms that are attributed to the theories of colon cleansing. As the colon normally expels waste, colon cleansing is generally unneeded. Colonic irrigation can disrupt the bowel's normal flora, and, if done frequently, can result in electrolyte depletion with dehydration. Rare but severe adverse events have been rectal perforation, as well as amoebic infection, from poorly sterilised equipment. Others claim that colon cleansing may impede the colon's shedding