Online SAR measurement error in high resolution slice accelerated 2D EPI

Slice accelerated or multiband (MB) 2D EPI has recently enabled fast, high resolution, whole brain imaging. However, as MB factors, resolution, and brain coverage increase so do the temporal frequency modulations of the MB RF pulses. Such rapidly modulated RF pulses can result in SAR overestimation during online SAR monitoring resulting in prematurely aborted scans even when pre-calculated SAR levels are below (60-70%) the FDA limit. We show that recent methods for minimizing peak power can also reduce SAR measurement errors with little or no cost in TR or image quality allowing MB acceleration gains to be more fully realized.

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