MRI

By Robert Lim, PTA

What is an MRI?

MRI's are a commonly used medical tool.

Image of a woman getting an MRI.

An MRI also known as magnetic resonance imaging is a non-invasive imaging technology that produces three dimensional detailed anatomical images of a body part that is being scanned. It is often used for disease detection, diagnosis, and treatment monitoring. The scanner is a tube that is surrounded by a giant circular magnet. The patient is usually placed on a movable bed that is inserted into the magnet. The magnet creates a strong magnetic field that aligns the protons of hydrogen atoms, which are then exposed to a beam of radio waves. A computer processes the receiver information, which produces an image.

What are some conditions that may prevent you from having an MRI?

When scheduling your appointment and prior to your exam, you may want to let the staff and the technologist about any  conditions that may affect the MRI.  The radiology staff will let then let you know whether you can have the MRI exam and whether the exam needs to be modified for your particular condition. The following below are some common conditions that you may want to let the staff know.

  • Pacemaker.
  • Pregnancy.
  • Claustrophobia.
  • Implanted drug infusion device (i.e., insulin pump).
  • Artificial heart valves.
  • Aneurysm clips.
  • Cochlear implants.
  • Metallic implants and prosthesis.
  • Vascular stent or stent graft.

What can you expect during the Exam?

The duration of the exam will vary but the average is 45 minutes to one hour per body part. You will be required to lie still during the actual exam. Depending on the body part that is being examined, you may be instructed to hold your breath for up to 30 seconds. The MRI magnet is usually permanently open on both ends. There is also a two way communication system for any information regarding the MRI scan between patient and the MRI technologist.  During the scan you will hear a loud intermittent banging noise which is very common. You will be provided with earplugs or head phones to help minimize the noise during the scan.

What are reasons that you may require an MRI?

There are number of scenarios that may require you to get any MRI. Your medical provider may order an MRI to help diagnose either the following:

  • Spine problems in the cervical, thoracic and lumbar spine.
  • Cartilage abnormalities in the either the shoulders, hips, knees, or ankle.
  • Problems with your spinal cord.
  • Ligament issues in any of the body parts.

By: Robert Lim, PTA

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