An interleaved, reverse gradient fMRI (RG-fMRI) with a point-spread-function mapping-based approach was recently proposed to minimize geometric distortion and signal dropout in echo-planar-imaging (EPI) by acquiring a pair of EPIs with the opposite (forward and reverse) phase-encoding gradient polarity and combining them after distortion correction. This study showed that the effective echo-shift map can be reliably obtained from PSF mapping to predict local signal dropouts. The predicted echo-shifting can provide guidance for protocol optimization for RG-fMRI using partial Fourier (PF) acquisition.
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