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MRI scan — brain
Category: Imaging & Scans · All imaging & scans
What it is
An MRI (magnetic resonance imaging) scan of the brain uses a strong magnet and radio waves — not X-rays — to build very detailed pictures of the brain and its blood vessels.
Why it is done
It is used to investigate headaches, fits, weakness or speech problems, stroke, memory problems and suspected tumours, and to follow up known conditions over time.
How to prepare
The team will ask detailed safety questions about implants, pacemakers, metal fragments and surgery, because the magnet is powerful. Remove metal objects, jewellery, watches and bank cards. Tell the team if you feel anxious in enclosed spaces.
What happens during the procedure
You lie on a table that slides into the scanner tube with a light frame (coil) over your head. The machine makes loud tapping and buzzing noises and you are given ear protection. You need to keep very still; the scan usually takes 20 to 45 minutes. Sometimes a contrast injection is given partway through.
Afterwards — recovery & results
You can usually go home straight afterwards and return to normal activities. A radiologist reports the scan and results are sent to your doctor, usually within days.
Risks & considerations
MRI has no ionising radiation. The main issues are the safety screening for metal and implants, discomfort from lying still, and anxiety in the enclosed space. Contrast dye (gadolinium) is used cautiously in severe kidney disease.
Watch: MRI scan — brain 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
Why is MRI so loud?
The noise comes from the magnetic coils switching on and off rapidly during scanning. Earplugs or headphones are provided and make it much more comfortable.
Can I have an MRI with a pacemaker?
Some modern pacemakers and implants are MRI-safe under controlled conditions and some are not. Always tell the team exactly what device you have so they can check before booking.
Related procedures — Imaging & Scans
Browse the M section of the A–Z list or return to the Procedures & Tests hub.