Implant device manufacturers often specify a RF exposure limit based on specific absorption rate (SAR) or B1+rms and a continuous active scan time in the device magnetic resonance imaging (MRI) labelling. Due to the restriction of the labeled SAR, MR sequence parameters may need to be adjusted to reduce RF power, resulting in prolonged scan time. The patient examination duration may be extended by up to 67% when compared to standard protocols. The overall session may be further prolonged due to additional wait time requirements from certain implanted devices, which can result in great inconvenience and extra cost to patients.
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