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CT scan — head
Category: Imaging & Scans · All imaging & scans
What it is
A CT (computed tomography) scan of the head uses X-rays taken from many angles and a computer to build detailed cross-section pictures of the brain, skull and sinuses.
Why it is done
It is often used after a head injury, or to look for causes of stroke symptoms, severe headache, confusion or fits, and to check for bleeding or swelling inside the skull.
How to prepare
You usually do not need to fast. Remove hair clips, earrings, glasses and dentures if asked. Tell the team about allergies and any kidney problems, because some scans use a contrast dye injection.
What happens during the procedure
You lie on a motorised table that slides through a wide, open ring while the scanner takes pictures. It is painless and usually takes about 10 minutes. For some scans a contrast dye is injected into a vein and can give a brief warm feeling.
Afterwards — recovery & results
You can usually go home soon afterwards. If you had contrast dye you may be asked to drink water and wait briefly before leaving. Results are reported by a radiologist, often the same day for urgent scans.
Risks & considerations
CT uses more radiation than a plain X-ray, so it is used when the information is needed. Contrast dye occasionally causes an allergic-type reaction, and the team checks kidney function first because the dye is cleared by the kidneys.
Watch: CT scan — head videos
Real procedure videos from the MedicalVideos.com library. Some clinical footage is graphic — that is the nature of a medical video library.
Related guides on MedicalVideos.com
Frequently asked questions
Is a CT scanner enclosed like a tunnel?
No — a CT scanner is a wide open ring, not a tunnel, and only your head passes through it. Most people do not find it claustrophobic.
Why is contrast dye sometimes used?
The dye makes blood vessels and some tissues stand out more clearly, which helps the radiologist spot bleeding, inflammation and other problems.
Related procedures — Imaging & Scans
Browse the C section of the A–Z list or return to the Procedures & Tests hub.