About Brain MRI
Magnetic Resonance Imaging (MRI) scans are frequently done to view the brain or other structures in the head, including the salivary glands, orbits or inner ear. MRI can reveal a superior image of these areas because it is not deflected by bone, as X-rays and ultrasound are. Brain MRI exams are commonly prescribed to evaluate stroke, dizziness, hearing problems, vision problems or unexplained headaches. This exam also is performed for patients who previously had cancer elsewhere in the body.

What to expect
During an MRI brain scan, you will lie comfortably on your back on a table that is moved inside a large magnet. A piece of equipment called a “coil,” which sends and receives the radio frequency waves used in this technology, will be placed around your head. A foam-lined cradle will help your head remain still during the exam.

You will be able to communicate with the technologist through a two-way intercom. During the scan, as with all MRI exams, you will hear various noises, ranging from a buzzing to a loud knocking. You will be given earplugs to diminish the noise.

Because an MRI exam can take images or “slices” from various angles, several sequences or sets of images will be taken. Each sequence will last from one to 10 minutes, and the technologist will inform you before the scanning noise begins. The total exam time for a brain scan can range from 30 to 60 minutes. You must lie very still during each sequence, in order to produce clear, diagnostic images.

Depending on your symptoms or prior medical history, you may be give an intravenous contrast medium for your scan. The technologist will explain this procedure to you if necessary.

Patient preparation
Unless sedation is being used to help you lie still, no preparation is necessary. Because the MRI uses a very large, strong magnet, you will be asked to remove and store any loose metal such as jewelry and keys.

Side effects and complications
Magnetic resonance imaging does not cause any known long-term side effects. You may experience temporary ringing in the ears, similar to the sensation following a loud music concert. The earplugs should minimize this. While MRI examination has no known effects upon a fetus, please let the staff know if you think you may be pregnant. In some cases, your scan may be modified or rescheduled later during your pregnancy.

Follow-up care
No follow-up care is necessary following a MRI brain scan.