For urologic CT examination, it is essential to hold urine in the bladder. It is also appropriate to drink a lot of water, the stomach is in a full condition, you can make an effective differential diagnosis. If you need a clearer examination, you should empty your bowels so that there will be less intestinal gas and the kidneys, ureters, and bladder will be visualized more clearly. If a CT enhancement is needed, a skin test for contrast media should be required to prevent allergic reactions. Urological CT can find out whether the kidneys, ureters, bladder and surrounding tissues, have lesions, and can make an effective diagnosis of urinary tumors, urinary stones, and adrenal gland diseases.