MRI RF heating can cause thermal damage to biological tissues, especially in patients with leaded implantable devices, by concentrating power deposition at the implant-tissue interface. With the emergence of B1+RMS as a more precise RF exposure metric than SAR, implantable device manufacturers have begun MR conditional labeling to fixed B1+RMS levels, in addition to SAR labeling. Our study characterizes the relationship between RF heating per SAR vs. B1+RMS-based scaling methods in the context of 3T Normal Operating and First Level Controlled Mode MRI exposure.
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