![]() The magnetic field is not harmful, but it may cause some medical devices, such as pacemakers or insulin pumps, to malfunction. MRI does not use the kind of ionizing radiation used in x-rays or CT scans, so there is no danger of excessive radiation exposure. MRI scans of muscles are especially useful in helping the physician identify the best site to perform a muscle biopsy. The level of detail in MRI images allows the physician to more accurately evaluate these structures to determine the presence of certain factors, such as inflammation, that are related to disease. ![]() ![]() Magnetic resonance imaging (MRI) is a noninvasive scanning technology that uses a powerful magnetic field and radio waves to generate digital images of organs, soft tissues, bones, and other internal body structures.
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