Definition: An MRI scanner creates magnetic fields that molecules in the body respond to. The MRI scanner detects these responses and creates a visual image that a radiologist examines. Because molecules in lesions (areas of inflammation) respond to MRIs differently than healthy areas, MRIs are useful in diagnosing and monitoring MS.
MRIs - Magnetic Resonance Imaging
By Julie Stachowiak, Ph.D., About.com
Updated: April 30, 2007
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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