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Abstract #4570

Point Spread Function Map for Distortion Correction with Double EPI Readout Acquisition Strategy at 3T

Yu Cai1, Qingwei Liu2, Mark Woods1, Craig Hamilton3, Hongyu An2

1Advanced Imaging Research Center, Oregon Health & Science University, Portland, OR, United States; 2University of North Carolina atg Chapel Hill; 3Wake Forest University

The current Point Spread Function (PSF) mapping technique uses an extra 2-3 min of scan time to acquire a PSF map for echo planar imaging (EPI) distortion correction, based on prevalent EPI acquisition parameters used in fMRI studies. However, when a subject moves during scanning the PSF map may not for the most appropriate method of distortion correction. A dual EPI readout train acquisition strategy has been developed that improves the performance of PSF map correction. This strategy embeds the PSF acquisition into the gradient echo EPI acquisition without increasing scan time synchronizes with the EPI acquisition.