A vascular MRI, sometimes referred to as a magnetic resonance angiography (MRA), looks at the blood vessels in your body — usually around your heart and chest. It is one of the best ways to check for any changes to blood vessels and arteries, helping doctors provide you with an accurate diagnosis and treatment plan.
A Vascular MRI works like other MRI scans — you are placed in the scanner and detailed images of your body are created using radio waves and a magnetic field. Unlike other MRIs, a Vascular MRI is focused specifically on your blood vessels rather than organs or other body parts, so contrast agents may be used to make the vessels more visible. The resulting images are displayed on a computer screen for your doctor to review.
During the scan, you will lie flat in the scanner while images are taken. The scanner can be quite loud, but the procedure is painless and involves very few risks.
There are several reasons why you might need a Vascular MRI. They are commonly used to check for blockages in blood vessels or aneurysms, and can help detect and diagnose the following:
* Blockages or narrowing in a blood vessel
Reduced blood flow can indicate a range of vascular conditions requiring treatment.
* Aneurysms
An abnormal widening of an artery that can be life-threatening if left undetected.
* Aortic conditions
Including a narrowed aorta or aortic dissection, where bleeding occurs in or along the wall of the aorta.
* Strokes or their causes
MRI can help identify the source of a stroke or assess stroke risk.
* Heart disease
Vascular MRI can assist in the detection and monitoring of heart conditions.
* Renal artery stenosis
Narrowing of the blood vessels in the kidneys, which can affect blood pressure and lead to renal failure.
Before a Vascular MRI is recommended, your doctor will discuss with you why they believe it is an important test, whether to spot signs of vascular disease or to assist with the treatment of an existing condition.
There is not much preparation required before a Vascular MRI. You can eat, drink, and take your medications as normal prior to the scan.
Some vascular imaging scans require a contrast dye to make your vessels more visible. This is administered through an IV line when you arrive. Inform your doctor beforehand if you have had a previous allergic reaction to contrast dye — an alternative may be used, or medication may be prescribed to take before the scan.
If you experience claustrophobia or anxiety about being in the scanner, speak to your doctor beforehand. A mild sedative may be prescribed, in which case you will need someone to drive you home after the scan.
On arrival, you will be given a hospital gown and locker space for your clothing and personal items. We recommend leaving valuables at home where possible. All jewellery and metal must be removed before the scan, and you should inform your doctor of any metal in your body so they can advise accordingly.
Once prepared, you will be asked to lie on the exam table outside the MRI scanner. Your doctor may ask you to position yourself in a specific way, and you will need to remain still throughout unless told otherwise.
The table will slide into the MRI scanner and the scan will begin. The machine can be very loud — with humming and clunking sounds throughout — which is completely normal. Headphones can be provided to reduce the noise, and music may also be played.
During the scan, images of your vessels will be taken and it is important to remain as still as possible to avoid blurring. The scan typically takes around an hour, depending on the number of blood vessels being examined. You will usually be told the expected duration beforehand, and the technician can speak to you through a microphone throughout the scan.
After the scan, most patients are free to leave immediately with no complications or side effects. You are generally able to drive and return to work or school as normal.
Your doctor will review the images for any irregularities or blockages. A normal result means no abnormalities were found. An abnormal result may suggest circulatory problems or atherosclerosis — the hardening of arteries — and you will likely be invited for a follow-up appointment to discuss diagnosis and treatment options.
Results are turned around as quickly as possible, though during busy periods you may wait a week or two. An estimated timeframe will be provided after your scan.
A Vascular MRI comes with a range of benefits, making it an excellent choice for examining blood vessels. The scan allows doctors to identify changes to blood vessels early — catching signs of blockages, hardening of arteries, vascular disease, or heart conditions that could lead to long-term complications.
As Vascular MRIs are safe, painless, and involve no radiation exposure, they are a great option for patients requiring a non-invasive test. With little aftercare involved, the procedure causes minimal disruption to your day and you can return to your usual activities immediately afterwards.
There are very few risks associated with a Vascular MRI. Where contrast dye is used, you may experience some minor discomfort when the IV is inserted. Let your doctor know of any previous reactions to contrast dyes.
Anxiety or claustrophobia is common in the scanner — speak to your doctor beforehand if this applies to you, as a mild sedative may be available.
Metal in your body or pockets can pose a risk in the MRI environment. You will be asked detailed questions about any metal implants or devices before the scan — answer as accurately as possible.
Patients with kidney disease should also be aware that contrast dye can affect kidney tissue. Disclose any history of kidney disease to your doctor so they can determine whether this is the right procedure for you.
Pregnant women are considered at higher risk during an MRI scan and will generally only be referred when the need for the scan outweighs the potential risks. Let your doctor know if you are pregnant before your appointment.
No — not everyone will require contrast dye for their Vascular MRI. You will be informed beforehand if contrast is required, and any allergies will be checked before it is administered.
Yes, in many cases you can still have a Vascular MRI if you have metal in your body, such as a pacemaker or metal plate. Let us know before the scan so we can discuss any risks and take appropriate precautions. In cases where it is not considered safe, alternative scans and procedures will be recommended.