Abdominal CT is often needed when abdominal lesions or injuries are suspected, or when abdominal lesions are characterized. Abdominal CT examination can understand the abdominal organs with or without infectious diseases, such as: inflammation, tuberculosis, abscess, etc.; with or without occupation, such as benign and malignant tumors, metastatic tumors, etc.; with or without deformity, stones, obstruction, perforation, effusion, etc.. It is commonly used to diagnose or assist in the diagnosis of liver cirrhosis, fatty liver, liver tumor, liver abscess, liver encrustation, cholelithiasis, biliary tumor, pancreatitis, pancreatic tumor, renal abscess, renal abscess, renal tumor, adrenal tumor and other diseases. Other intra-abdominal organs, such as bladder, prostate, female internal genital tumors and metastatic cancer in retroperitoneal lymph nodes can also be detected by CT. The main groups of people who need abdominal CT examination are: patients with lesions and injuries of abdominal organs.