CT can examine the intestine, but the first choice for examining the intestine is not CT, but colonoscopy, which can detect early malignant lesions. the purpose of CT examination of the intestine is to clarify whether there is obvious intestinal obstruction, intestinal overlap, intestinal tumors, etc., and for patients who already have clear tumors, CT can clarify the extent of intestinal tumor invasion and whether there are metastases to other organs, such as lung, liver, pancreas, spleen, kidney, abdominal cavity and retroperitoneum. CT examination of the intestine can also be used to determine whether there is any embolism in the superior mesenteric artery and inferior mesenteric artery through angiography, so as to determine the blood supply to the intestine.