Medical Tests
Information on medical tests, including how to prepare, what to expect, and what the results mean.

Computed Tomography (CT) Scan of the Head and Face

Test Overview

A computed tomography (CT) scan uses X-rays to make pictures of the head and face.

During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. Your head will be positioned inside the scanner. The CT scanner sends X-rays through the head. Each rotation of the scanner takes a second and provides a picture of a thin slice of the head and face. One part of the scanning machine can tilt to take pictures from different positions. All of the pictures are saved as a group on a computer. They also can be printed.

An iodine dye (contrast material) is often used to make structures and organs easier to see on the CT pictures. The dye may be used to check blood flow, find tumors, and look for other problems. Dye can be put in a vein (IV) in your arm. CT pictures may be taken before and after the dye is used.

A CT scan of the head can give some information about the eyes, facial bones, air-filled cavities (sinuses) within the bones around the nose, and the inner ear. If these areas are of concern, a specific CT scan of the area is usually done.

A CT scan of the head may be used to evaluate headaches. For more information, see:

Should I have imaging tests to evaluate my headaches?

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