X-ray of your belly. Ct, or computed tomography is a special was of taking x-rays that allows up to see the body in slices. We use contrast, a type of x-ray dye, to better see blood vessels (iv contrast) and the GI tract (oral contrast). The abdomen covers from the diaphragms through the kidneys, and the pelvis covers from the hip bones to your upper thighs. They are done for mahy reasons, not just cancer staging.
Images. Using dye to get better pictures. See radiologyinfo. Org.