Magnetic Resonance Imaging

The use of magnetic waves to make pictures of the inside of the body. Using a large magnet, radio waves, and a computer, an MRI produces two-dimensional and three-dimensional pictures.

Parts of the Body Involved

An MRI can be used to evaluate any part of the body

Reasons for Procedure

  • To diagnose internal injuries or conditions
  • To monitor effects of medications and treatments inside the body

Risk Factors for Complications during the Procedure

You may not be able to have an MRI exam if you have any of the following in your body:
  • Pacemaker
  • Neurostimulator
  • Ear implant
  • Metal clips in your eyes
  • Implanted port device
  • Intrauterine device (IUD)
  • Metal plate, pins, screws, or surgical staples
  • Metal clips from aneurysm repair
  • Retained bullets
  • Any other large metal objects implanted in your body (tooth fillings and braces are usually not a problem)
You should tell the doctor/technician if your occupation involves work with metal filings or particles.

What to Expect

Prior to Procedure

In the days leading up to your MRI exam:
  • You may be asked to avoid using hair gel, spray, lotions, powders, and cosmetics before your MRI
  • If your doctor prescribes a sedative:
    • Arrange for a ride to and from the exam
    • Do not eat or drink at least 4 hours before the exam
    • Take it 1-2 hours before the exam, or as directed
  • If you have not been prescribed a sedative, eat or drink normally, unless your doctor or the technician tells you otherwise
Once at the MRI center:
  • You will be asked about the following:
    • Medical history
    • Pregnancy, if female
    • Allergies
    • Prior head surgery
  • You'll remove any metal containing objects, such as jewelry, hairpins, hearing aids, glasses, wigs (with metal clips), and/or nonpermanent dentures
  • An x-ray may be taken beforehand if there is doubt as to whether there are metal objects in your body
  • You'll also remove all objects from your pockets or change into a hospital gown
During Procedure:
  • You may be given ear plugs or stereo headphones to wear, due to the loud banging noise the MRI machine makes during the exam
  • You may receive an injection of contrast imaging dye
  • Often, a family member or friend will be allowed to remain in the MRI examining room with you
Anesthesia

Outcome

After the exam, an MRI radiologist will analyze the images and send a report to your doctor. Your doctor will discuss the results and any further action, tests, or treatment that may be necessary with you.

Call Your Doctor If Any of the Following Occurs

  • Any allergic or abnormal symptoms after an exam in which you were injected with contrasting dye
  • Worsening of any of the symptoms that prompted the MRI exam