MR angiography shows blood vessels of the brain and neck without radiation. Learn when it is used, how it differs from CT angiography and how to prepare.
MR angiography (MRA) uses MRI to show the arteries of the brain and neck without radiation, and often without contrast. It is used to look for narrowing, aneurysms, vessel tears and malformations, and for follow-up in people who need repeated scans or should avoid iodine contrast.
How Does MRA Work?
In time-of-flight MRA, the scanner tracks moving blood to make vessels bright without contrast. In contrast-enhanced MRA, gadolinium is injected and a fast scan captures vessels. MRA is often combined with an MRI brain in the same visit. See MRI brain scan.
QuestionMRA helpNarrowing in neck or brain arteriesShows site and degreeUnruptured aneurysm screening or follow-upGood for medium and large aneurysmsArtery tear (dissection)Shows wall changes with fat-suppressed imagesVascular malformationShows the tangle and feeding vesselsYoung or radiation-sensitive patientsAvoids radiationWhen Is It Advised?
- After stroke or TIA to look for artery narrowing
- Headache with suspected aneurysm or vessel problem, after discussion with your doctor
- Family history of brain aneurysm
- Follow-up of known aneurysm or malformation
- Pulsating noise in the head in selected cases
MRA vs CT Angiography
MRA avoids radiation and iodine, and is good for follow-up. CT angiography is faster, shows small vessels and aneurysms in more detail, and is preferred in emergencies. Many centres use both in different situations. See CT angiography vs MR angiography and CT angiography of the brain.
Preparation and Procedure
No fasting for a plain MRA. Remove metal and tell the staff about pacemakers, aneurysm clips and implants. The scan takes about 15 to 30 minutes, and you lie still with a head coil. It is loud, so earplugs are given. See MRI preparation and MRI safety.
A Practical Example
Sunil, 52, has a sister who had a brain aneurysm. His doctor advises a screening MRA. It shows a small 3 mm bulge, which his neurosurgeon decides to watch with yearly MRA, advising strict blood pressure control and no smoking. He avoids radiation and iodine contrast yearly.
Care Tips and Key Facts
- MRA is radiation-free and often contrast-free
- Control blood pressure and avoid tobacco
- Report sudden severe headache immediately
- Keep all scans for comparison
After the Scan and Next Steps
Take the report to a neurologist or neurosurgeon. Small aneurysms or mild narrowings are usually followed with regular scans and medicines. Larger or high-risk findings may need treatment. Do not ignore warning signs such as sudden severe headache, weakness, speech trouble, vision loss or fainting. Seek emergency care at once if they appear.
Questions to Ask Your Doctor
- Is MRA or CT angiography better for my question?
- How large and how risky is my finding?
- How often should I repeat the scan?
- Should my relatives be screened?
Common Mistakes to Avoid
- Ignoring a sudden severe headache because an earlier MRA was normal.
- Not telling the staff about aneurysm clips or implants.
- Moving during the scan.
Booking, Timing and Report
Book a slot of about 45 to 60 minutes, and arrive 15 minutes early for the safety form. Carry your doctor's prescription, implant cards and old scans. Reports are usually ready within 24 to 48 hours, and you can request images on a CD or digital link for your specialist.
Understanding Results and Next Steps
The report may describe the degree of narrowing as mild, moderate or severe and note any bulge in a vessel wall. Small aneurysms are followed with repeat imaging, usually at 6 to 12 months and then yearly. Treatments are chosen by the neurosurgery team after weighing size, location, age and your general health. Share family history clearly with your doctor.
Always carry your previous MRA or CT angiography images for comparison.
Key Reminder
A normal MRA is reassuring, but sudden severe headache or stroke symptoms always need emergency care.
Frequently Asked Questions
What is MR angiography?
An MRI technique that shows blood vessels.
Does MRA need contrast?
Often not.
Does it use radiation?
No.
Can MRA find aneurysms?
Yes, especially medium and large ones.
Is MRA better than CT angiography?
It depends; CT is better in emergencies.
How long does it take?
About 15 to 30 minutes.
Can I have MRA with a pacemaker?
Only if MRI-conditional.
Is it safe in pregnancy?
Non-contrast MRA can be done if needed.
When is the report ready?
Usually 24 to 48 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
Related Reading
- MRI Elbow Scan for Tennis Elbow and Injuries
- MRI Liver Scan for Liver Lesions and Fatty Liver
- MRI Wrist and Hand Scan: Uses and Preparation
- MRI for Fibroids and Endometriosis
- MRI Ankle and Foot Scan: Uses and Preparation
- MRI Orbit Scan for Eye and Optic Nerve Problems
- MRI for Children: Preparation and Sedation
