Monday, March 26, 2012

MRI: A Valuable Diagnostic Tool

Through the use of magnetic resonance imaging, or MRI, patients at Gainesville Memorial Hospital can be examined by a machine that some physicians say reveals as much, or more, than being able to actually see inside the body.

Unlike x-ray imaging, MRI does not rely on radiation. Instead, it uses a computer and strong magnetic field (5000 times stronger than the earth’s magnetic field) to look into the body.

“MRI provides excellent anatomical detail,” says Doohi Lee, M.D., diagnostic radiologist at Gainesville Memorial Hospital. “The pictures produced with magnetic resonance imaging offer more detailed views of soft-tissues than those obtained with other scanning techniques.”

MRI images are used to detect many abnormalities in all parts of the body. It is frequently used to examine the brain, the spine, the abdomen and pelvis, and the skeletal system.

In the brain, for example, MRI has proven useful in diagnosing small strokes (that could not have previously been discovered), tumors, and multiple sclerosis.

In the spine, disc herniations can be seen very accurately. 

One of the innovations Doctor Lee is offering in spinal imaging at Gainesville Memorial Hospital is looking for inflammation in the spine with MRI contrast administration.

In the skeletal system, MRI is the main diagnostic tool for evaluating rotator cuff tears in the shoulder, various ligament and joint abnormalities of the knee, ankle and the wrist.

The eye, ear, nose, throat, heart, abdomen, pelvis, and feet are other areas of the body that can be viewed using magnetic resonance imaging.

About the procedure

Prior to the MRI exam, patients are asked to complete a questionnaire. This information is gathered to ensure patients' safety and to facilitate the technician’s ability to obtain the highest quality images possible. At this time a technologist will explain the procedure and answer any questions.

Due to the use of magnetic fields, patients are asked to remove clothing with metal; jewelry, hair clips, hearing aids, credit cards, coins, or other metal objects that could interfere with the procedure. Patients may be asked to wear a hospital gown to avoid problems. Because MRI works with magnetic fields, this procedure cannot be performed on patients with pacemakers, certain surgical implants, or cerebral aneurysm clips.

Patients are assisted onto a table and guided into a machine. The scan is completely painless, but is somewhat noisy (e.g., knocking or thumping sounds will be heard). Earplugs are available. A two-way intercom allows constant communication with the technologist during the procedure.

An MRI exam takes approximately 30 to 40 minutes to complete. Results of the exam are forwarded to the patient's physician, usually within 24 - 48 hours.

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