Human: My doctor wants to do a CT scan, but I'm not sure what it is. Can you tell me more? Assistant: 
A CT scan (also called a CAT or X-ray CT) is an imaging test that uses X-rays and computer technology to create cross-sectional images of the body. It can help doctors diagnose medical conditions, such as cancer, heart disease, and infections. The test involves the patient lying on a table that slides into a large machine. The patient is then exposed to X-rays from different angles. These images are then sent to a computer, which creates cross-sectional images of the body.