CT

n imaging procedure in which a computer is connected to an X-ray machine and creates a series of detailed pictures of different areas of the body. Each tissue in the body absorbs radiation and returns radiation differently. The pictures are taken from different angles and are then processed to create a three-dimensional picture. Sometimes a contrast substance is injected into a vein or can be swallowed. The contrast material causes the tissues and organs to appear more clearly. CT can be used to help diagnose diseases, plan treatment, or find out how treatment works. The test is also called CT scan, CAT scan.