A computed tomography scan is a diagnostic medical test that uses a combination of X-rays and a computer to create multiple images of the organs, bones, and other tissues of the body.
A radiology technologist will perform the CT scan. During the test, you’ll lie on a table inside a large, doughnut-shaped CT machine. As the table slowly moves through the scanner, the X-rays rotate around your body. It’s normal to hear a whirring or buzzing noise. Movement can blur the image so straps and pillows may be used to help you maintain the correct position and to help you remain very still during the exam. You may need to hold your breath at times. How long the scan takes will take depend on what parts of your body are being scanned. It can take anywhere from a few minutes to a half-hour.