Abdominal CT can check whether there are infectious diseases in the abdominal organs, such as infectious diseases, etc., with or without occupancy, such as tumors, metastatic tumors, etc., stones, lesions caused by vascular factors and so on. 1. Infectious diseases: appendicitis, cholecystitis and other diseases can be detected, which is manifested by the enlargement of the organs, which can be accompanied by inflammatory reaction manifestations such as oozing, and the more serious patients can have the manifestations of peritoneal effusion and dilatation of intestinal tubes and other manifestations. 2. Occupancy: the number, size and scope of tumor can be determined by abdominal CT, such as occupying lesions in liver, kidney, intestines, pancreas, etc. Abdominal CT, especially enhanced CT, can diagnose abdominal cavity occupancy and determine the nature of the lesion and its scope of involvement through the effect of contrast medium. 3. Stones: such as gallbladder stones, generally shown as high-density, size and shape of the organs within the high-density shadow. Pure cholesterol stones, do not show shadow. 4. lesions caused by vascular factors, can do abdominal blood vessels CTA, to assist in the diagnosis of such as aortic coarctation, ischemic bowel disease, gastrointestinal bleeding. Abdominal CT is mainly for abdominal diseases, in addition to the above diseases, but also can check the prostate, bladder and so on. It is recommended to follow the doctor’s instructions to improve the relevant examination.