1Radiology, Brigham and Women's Hospital, Boston, MA, United States, 2Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
This work
presents a new approach to reconstruct SMS-EPI data that employs Dual-Polarity GRAPPA (DPG). DPG accurately models non-linear EPI phase
errors between data sampled on positive versus negative readout gradients. When applied to SMS-EPI data, DPG can simultaneously
and robustly perform slice separation, recovery of missing data from in-plane
acceleration, and slice-specific ghost correction. Phantom and in vivo results are compared to a
conventional SMS reconstruction, and demonstrate that DPG reduces residual
ghosts and ghosting-related phase interference artifacts.
