Imaging
MRI Scan
An MRI scan uses strong magnets and radio waves — not radiation — to produce very detailed images of soft tissues like the brain, spine, joints and organs.
Quick answer
MRI Scan: what it is and what the results mean
Magnetic resonance imaging (MRI) uses a powerful magnetic field and radio waves to create highly detailed images, especially of soft tissues.
- Why it is done: MRI is excellent for the brain and spinal cord, joints and ligaments, and many organs — used to investigate things like strokes, slipped discs, joint injuries, tumours and much more.
- Understanding results: A radiologist studies the detailed images and reports to your doctor.
What it is
Magnetic resonance imaging (MRI) uses a powerful magnetic field and radio waves to create highly detailed images, especially of soft tissues.
Why it is done
MRI is excellent for the brain and spinal cord, joints and ligaments, and many organs — used to investigate things like strokes, slipped discs, joint injuries, tumours and much more.
What to expect
You lie still on a table that slides into a tunnel-shaped scanner. It is painless but noisy (you are given ear protection) and can take 15–60 minutes. You must stay still, and metal objects must be removed. Tell staff about any metal implants or a pacemaker.
Understanding the results
A radiologist studies the detailed images and reports to your doctor. MRI shows soft tissues in more detail than CT or X-ray.
Good to know
Risks and limitations
MRI uses no radiation and is very safe, but the strong magnet means some metal implants and devices are unsafe — always tell staff about implants, a pacemaker or metal fragments. The enclosed space can be difficult for people with claustrophobia; support is available.
Education and reference only. This explains the test in general terms and is not medical advice. Always follow the specific instructions from the team arranging your test, and discuss your results with your clinician.
Answers
MRI Scan: frequently asked questions
Does an MRI use radiation?
No. MRI uses strong magnets and radio waves rather than radiation, which is one reason it is often used for detailed soft-tissue imaging.
What if I am claustrophobic?
Tell the team in advance — they can offer support, and in some cases wider "open" scanners or mild sedation are available. Many people manage well with reassurance and preparation.
Related tests
Other imaging investigations
Sources
Where this is drawn from
- NHS — Tests and treatments
- NICE — diagnostic guidance
- Royal College of Radiologists / relevant professional body
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