Exposure to the RF energy of an MRI shall be limited to prevent potential harm to biological tissues. Whole-body SAR, averaged over any 6-minute interval, shall be limited to 2W/kg and 4W/kg under the limits of Normal and First Level Controlled Operating Mode, respectively, and is further restricted to twice the operating mode limit over any 10-second period. Our study investigates whether similar short-duration assessments are necessary for the alternative RF exposure metric of B1+RMS, in the context of RF heating safety of cardiac protocols with leaded cardiac implants.
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