MRI
What Is MRI, and How Does It Work?

Magnetic resonance imaging (MRI) technology is unrivaled in its ability to produce high resolution images of soft tissue and structural anatomy. Conditions that may only be apparent from physical signs and symptoms may be clearly seen, providing better information to determine appropriate treatment. During a MRI examination the part of your body to be studied, will be positioned in the center of a magnetic field and scanned. In some cases, the radiologist will recommend an intravenous (IV) contrast injection to further enhance the results of the study.

MRI, which uses magnetic fields, radio waves and complex computer processing to produce sectional images of the body, has revolutionized the field of musculoskeletal and neurologic imaging. Images of the brain, spine and joints, not attainable with any other imaging modality are produced with no exposure to radiation. MRI can also depict the liver, gallbladder, pancreatic ducts and bile ducts (MRCP MR cholangiopancreatography). MRI can be used to examine arteries of the brain, neck, chest, abdomen and extremities.

Due to the strength of magnetic fields used in MRI and the configuration of the magnet, certain conditions may prevent MRI examination of some patients. Patients with a cardiac pacemaker or brain aneurysm clips cannot safely have a MRI exam. Without sedation, infants, small children, claustrophobic patients and / or those with severe pain or physical limitations may not be able to complete a MRI exam, which requires the patient to lie still. For safety reasons, all patients are carefully screened before being placed inside the magnet. In some circumstances short bore MRI, open MRI or CT may provide alternatives for examination.

When you are placed inside a large magnet field for your examination, the protons in your body's hydrogen atoms temporarily align themselves in a position to receive radio signals from the MRI unit. As the MRI sends these signals, your body responds with signals of its own. The computer captures these signals, analyzes them and translates them into an image of the body part being scanned. These digital images are sent to a computer workstation for review and are digitally archived (stored) for long term use.