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Abstract #4858

EPI with Parallel Imaging (eπ2) self-calibrates the image distortion due to B0 field inhomogeneity

Hong Hsi Lee1, Berkin Bilgic1, and Susie Y Huang1
1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States


Correcting image distortions in echo-planar-imaging (EPI) due to B0 field inhomogeneity usually requires additional acquisitions, such as a B0 field map or blip-up-blip-down image pair. Interestingly, susceptibility distortions in EPI with parallel imaging can be corrected by leveraging the mismatch in phase-encoding polarity and/or effective echo-spacing between the auto-calibration-signal and under-sampled data, obviating the need for additional image acquisitions. Here we demonstrate the proposed pipeline of susceptibility distortion correction in in vivo diffusion MRI data of a healthy subject, and the results and estimated field values are comparable with the conventional method.

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