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CT head scan
Category: Imaging & Scans · All imaging & scans
What it is
A CT head scan takes X-ray pictures in slices through the brain, giving fast, clear images of bleeding, skull fractures, tumours and major strokes. It is the first-line emergency brain scan because it is quick and widely available.
Why it is done
It is used after head injury, for sudden severe headache or suspected bleeding, acute stroke assessment (including before clot-busting treatment), reduced consciousness, and when MRI is unavailable or unsafe for the patient.
How to prepare
Usually no preparation is needed; you remove metal hair accessories and earrings. Contrast dye through a vein is added for some indications. Tell the team about allergies to contrast, kidney problems, pregnancy and metformin use.
What happens during the procedure
You lie on a table that moves through a ring-shaped scanner; the head may rest in a support. The scan itself takes only a few minutes and is painless. You will be asked to keep very still.
Afterwards — recovery & results
You can usually go straight home or back to the ward. Results in emergencies are available within minutes to an hour; routine scans are reported to your referring team. If contrast was given, drink fluids afterwards.
Risks & considerations
CT uses ionising radiation — the dose is justified by the diagnostic need, especially in emergencies. Contrast reactions are uncommon; kidney effects are considered in susceptible patients. CT is less sensitive than MRI for many non-emergency brain conditions, which may follow if needed.
Watch: CT head scan 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
CT or MRI — why both sometimes?
CT is fastest for bleeding and fractures and is the emergency workhorse. MRI shows much more soft-tissue detail for tumours, inflammation and early stroke. They answer different questions.
Is the radiation dangerous?
A single head CT carries a very small theoretical risk, far outweighed by the benefit of diagnosing bleeding or stroke promptly.
Related procedures — Imaging & Scans
Browse the C section of the A–Z list or return to the Procedures & Tests hub.