Magnetic resonance imaging (MRI) is the single most useful test available for diagnosing spinal disorders. Unlike an x-ray or CT scan which use radiation, a spine MRI is a non-invasive imaging technique that uses powerful magnets, radio wave transmitters and receivers, and a computer to produce exceptionally detailed images of the spine and other structures within the body that are not easily visualized in an x-ray. In some cases, contrast material may be given to enhance the quality and the power of the study. This is a water-soluble, non-radioactive, colorless substance that is taken by mouth or injected into a vein during the test.

Before the MRI
Preparation for the MRI procedure includes the following:

Remove all jewelry and metal objects such as hairpins or barrettes, hearing aids, eyeglasses, and dental pieces because of the strong magnetic field.

Tell the radiologist if you:

Are claustrophobic and think that you will be unable to lie still while inside the scanning machine.
Have a pacemaker, or have had heart valves replaced.
Have metal plates, pins, metal implants, surgical staples, or aneurysm clips.
Have permanent eyeliner.
Are pregnant.
Ever had a bullet wound.
Have ever worked with metal (i.e., a metal grinder).

What to Expect During an MRI
In general, MRI procedures follow this process:

You will lie on a table that slides into a tunnel in the scanner. It is important that you remain very still during the examination.

During the scanning process, a clicking noise sounds as the magnetic field is created and pulses of radio waves are sent from the scanner. You may be given headphones to wear to help block out the noises from the MRI scanner and hear any messages or instructions from the technologist.

The MRI staff will be in another room where the scanner controls are located. However, The technologist will be watching you at all times. Speakers inside the scanner will enable the staff to hear you and communicate with you. You will have a call bell so that you can inform the staff if you are having any problems during the procedure.

At intervals during the test — and depending on the area of the body being examined — you may be instructed to hold your breath for just a few seconds. You will then be told to breathe.

Computers will form 2-dimensional images of the body structure or organ.

Your physician will discuss the results of your MRI with you at a later time, after the images have been carefully analyzed.