The CT scan uses the advanced computer analysis and X-ray technology to provide the complete details of your body. When your doctor has requested you to take a CT scan of Mastoid bones, then it indicates that your doctor wants to diagnose the bone ridge behind your ear. Though it is called the bone, the mastoid does not have any structure with any other bones associated in the body. The mastoid is made up of air sacs and it looks like a sponge.
To function properly, the mastoid bone should get the air though other parts of the ear, which also includes Eustachian tube. If any block or infection occurs in the Eustachian tube, then it results in infection in the mastoid bone. The infection in the mastoid bone is called the mastoiditis or the mastoid bone infection in the skull.