GRE reference scan for robust reconstruction of high resolution slice and in-plane accelerated 2D GE EPI at 7T
An T. Vu 1 , Steen Moeller 1 , Edward Auerbach 1 , Kamil Ugurbil 1 , and Essa Yacoub 1
University of Minnesota, CMRR, Minneapolis,
MN, United States
High temporal, high spatial resolution 2D EPI requires
acceleration along both the in-plane phase encode (e.g.
GRAPPA) and slice directions (e.g. multiband, MB). For
such acquisitions, image quality is particularly
sensitive to motion during segmented multi-shot
reference scans, which is lengthened by a factor of MB.
We propose the GRE flash for in-plane unaliasing of high
resolution slice accelerated 2D EPI. With this
technique, motion during reference scan related
artifacts and reconstruction noise are significantly
reduces especially at higher spatial resolutions
(<1.25mm isotropic). For 0.9mm data, we found SNR to
improve by 40% over conventional segmented EPI reference
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