Image module

MRI

Magnetic resonance imaging (MRI) is a test that produces very clear pictures, or images, of the human body without the use of x-rays. MRI uses a large magnet, radio waves and a computer to produce these images. The MRI examination poses no risk to the average patient if appropriate safety guidelines are followed.

Patients with the following medical devices can be safely examined with MRI:

  • Surgical clips or sutures

  • Artificial joints

  • Staples

  • Cardiac valve replacements

  • Disconnected medication pumps

  • Vena -ava filters (after 6 weeks for certain types)

  • Brain shunt tubes for hydrocephalus

  • Metal stents

In most cases, the procedure takes 40 to 80 minutes, during which several dozen images may be obtained.
As the MRI scan begins, you will hear the equipment making a muffled thumping sound that will last for several minutes. Other than the sound, you should experience no unusual sensations. Certain MRI exams require an injection of a contrast material called gadolinium. This helps identify certain anatomic structures on scan images.
If you have questions, please tell the technologist or the physician and they will address your concerns. The results of your MRI should be available within 24 hours after your test. Your physician will discuss the results with you.

  • Heart pacemaker

  • Cerebral aneurysm clip (metal clip on a blood vessel in the brain)

  • Pregnancy

  • Implanted insulin pump (for treatment of diabetes), narcotics pump (for pain medication), or implanted nerve stimulators (“TENS”) for back pain

  • Metal in the eye or eye socket

  • Cochlear (ear) implant for hearing impairment

  • Weight of more than 300 pounds

  • Inability to lie on back for 30 to 60 minutes

  • Claustrophobia (fear of closed or narrow spaces). Please note: if this condition applies to you, some patients may be candidates for sedation as long as prior arrangements have been made to the exam.

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