Abstract #1377
Online SAR measurement error in high resolution slice accelerated 2D EPI
An T. Vu 1 , Edward Auerbach 1 , Kamil Ugurbil 1 , and Essa Yacoub 1
1
University of Minnesota, CMRR, Minneapolis,
MN, United States
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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