A<unk>  is a form of<unk>  radiography in which x-rays of the colon and rectum are taken using two forms of<unk>  to make the structures easier to see. A liquid containing<unk>  (that is, a radiocontrast agent) is put into the rectum.<unk>  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.<unk> s are less invasive than a colonoscopy and have comparatively fewer issues in a viable large bowel.
Double-contrast barium enema
Sigmoidoscopy
Lower gastrointestinal series
Dry enema
Double-balloon enteroscopy
Magnetic resonance enterography
Computed tomography enterography
Stool test