CTU refers to CT urinary tract imaging, a test that forms the urinary tract under the conditions of the CT equipment.CTU is mainly used to determine whether a patient has urethral stricture, ureteral stricture, hydronephrosis, kidney stones, pelvic tumor, kidney tumor, etc. CTU test is a very important test, when urological ultrasound or ordinary CT is not able to detect the situation, you can Consider CTU examination. The CTU test requires the injection of a contrast agent.