Carotid Artery Scan >> MRI

What is MRI?

MRI stands for magnetic resonance imaging. The technique is a radiological test to look at the carotid arteries. MRI is a safe, painless way for doctors to get images of your body systems. MRI is very sensitive for identifying abnormities in blood vessels, soft tissue, the brain, spine and other organs. The technology produces sharp computerized images of internal body tissues that can not be obtained with normal x rays.

How useful is MRI to screen for carotid artery disease?

MRI produces excellent images of the carotid artery. It will easily identify evidence of any disease in the carotid artery. The images can even be magnified and the anatomy clarified.

Where is MRI done?

The carotid study is usually in a radiology department but may also be done in a doctor’s clinic with close by facilities. The entire procedure takes no more than 10-15 minutes. Once the individual arrives to the office, he will change into a gown and be instructed to lie on a bed. The bed then moves into a tunnel where the MRI images are obtained. During this time, the individual is asked to hold his breath to avoid any motion artifact.

Is MRI safe?

For most people, the MRI is completely safe. However, in most cases, pregnant women should not have MRI scans. Please let the staff know if you are pregnant. MRI does not use any type of radiation, but does produce a powerful magnetic field.

Who should not have an MRI?

To assure that you will have no adverse effects from the magnetism, the staff need to know if you have any metal in the body.

Please advise the staff if you have:
• cardiac pacemaker or artificial heart valve
• metal plate, pin, surgical staples or clips, or other metallic implant
• aneurysm clips
• inner ear implant
• intrauterine device, such as Copper-T IUD
• permanent eyeliner (tattoo)
• metal fragments in your eye or in your body
• been a metal worker
• a biostimulator

Is there any dye used?

For carotid artery screening, a dye is injected. This use of contrast media can help to evaluate the carotid artery and identify and plaque present.  Gadolinium has been used for many years and has proved to be very safe with few incidences of side effects. Some patients may experience a mild skin rash.

Is MRI comfortable?

MRI is generally comfortable and painless. However, some patients may complain of the noise during the scanning procedure. This can be avoided by wearing ear plugs. Recent advances have newer generation of "Open" MRI unit produces much less noise and there is no feeling of claustrophobia.

What does one do after a clotted artery is identified?

Once a block in the carotid artery is identified, the type of treatment depends on the degree of blockage. If the blockage is less than 60%, the individual is placed on aspirin. If the block is more than 60%, surgery is highly recommended to prevent strokes.

How often is MRI?

MRI is uniquely suited for serial, repeated examinations of plaque because it is non-invasive.  The test can be repeated annually.

Does my insurance pay for an MRI?

IF you have any symptoms or a prior history of a stroke, most insurance companies will cover the cost. For screening MRI, one may have to pay anywhere from $2-300.

How long will the exam take?

Carotid exams do take only a few minutes. Ther us no sedation required and patients go home after the test. There are no special preparations. You should eat normally and follow the normal dosing of your prescribed medications unless your doctor gives instructions to do otherwise. Dress in loose, comfortable clothes with no metal.

How long does it take for my physician to get the results of the examination?

The radiologist will review and interpret your MRI examination upon completion. Within 24 hours, your physician will have a written report and copies of the film for visual inspection of the findings.

By ScanDirectory.com Staff
April 18, 2007