As a Noun: 1. A CT SCAN (or CAT SCAN) is a type of x-ray that also uses digital computer technology. You lie on a table and a scanner rotates around your body. The CT SCAN can show everything, including bones, joints, and blood vessels. Note: 1. There appears to be no commonly used Auslan sign for CT SCAN. If you know a sign for CT SCAN used by you or other Auslan users (deaf people or interpreters) please go to "missing sign feedback" and supply details. Thank you.