June 12, 2026 · Journal of magnetic resonance imaging : JMRI · DOI: 10.1002/jmri.70371

B1+rms for Implants: A Review of Intended Use

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The authors aim to clarify the advantages of the B1+rms metric over the Specific Absorption Rate (SAR) for assessing radiofrequency exposure in Active Implantable Medical Devices (AIMDs) during MRI procedures. They highlight that while SAR is traditionally used for patient safety, B1+rms offers a more precise evaluation of AIMD/RF interactions, thereby improving the safety and effectiveness of MR Conditional labeling. The review addresses common confusions regarding B1+rms computation and application, ultimately advocating for its adoption in clinical settings.

Michael Steckner, Louai Al-Dayeh

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