Imaging
MR Angiogram
An MR angiogram uses an MRI scanner — and sometimes contrast dye — to produce detailed images of blood vessels without X-rays.
Quick answer
MR Angiogram: what it is and what the results mean
Magnetic resonance angiography (MRA) uses the strong magnetic field and radio waves of an MRI scanner to map blood vessels. It can be done with or without a gadolinium contrast injection.
- Why it is done: It is used to look at arteries and veins in the brain, neck, chest, abdomen and legs — for example to find aneurysms, narrowing, malformations or blockages — particularly when avoiding X-ray radiation is preferred.
- Understanding results: A radiologist reviews the images and reports whether the vessels are normal, narrowed, blocked or abnormally shaped, helping guide treatment decisions.
What it is
Magnetic resonance angiography (MRA) uses the strong magnetic field and radio waves of an MRI scanner to map blood vessels. It can be done with or without a gadolinium contrast injection.
Why it is done
It is used to look at arteries and veins in the brain, neck, chest, abdomen and legs — for example to find aneurysms, narrowing, malformations or blockages — particularly when avoiding X-ray radiation is preferred.
What to expect
You lie on a table that slides into the tunnel-shaped scanner, which is noisy; you are given ear protection. The scan can take 30–60 minutes and you must keep still. If contrast is used, it is injected through a cannula in the arm.
Understanding the results
A radiologist reviews the images and reports whether the vessels are normal, narrowed, blocked or abnormally shaped, helping guide treatment decisions.
Good to know
Risks and limitations
MRA does not use X-rays, but the strong magnet means it is not suitable for some people with certain metal implants or pacemakers — you will be screened first. Gadolinium contrast is generally safe but used cautiously in poor kidney function.
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
MR Angiogram: frequently asked questions
Is an MR angiogram better than a CT angiogram?
Neither is simply “better” — MRA avoids radiation and is good for certain vessels, while CTA is faster and shows some areas more clearly. Your doctor chooses based on which vessels are being examined and your circumstances.
Can I have an MR angiogram if I am claustrophobic?
Tell the team beforehand. Options include a mild sedative, an open or wider scanner where available, and support from staff. The scan can be paused if you need a break.
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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