It is a painless imaging technique that uses a rotating beam of X-rays to create cross-sectional images of the lower abdomen. The scan helps visualize the organs, blood vessels, and bones in the abdominal cavity. Your doctor may advise this test to diagnose the cause of problems such as mass and tumours, to find out the size and location of the kidney stones, infections such as appendicitis, injuries following trauma, and to check for intestinal obstruction.