High-resolution multi-echo MRI at ultra-high field for ex vivo imaging is time consuming, SNR starved and suffers from B0 inhomogeneity induced geometric distortions due to low-bandwidth in the readout direction. Fieldmap-based correction cannot correct singularities in regions of severe distortion, and reversed gradient (RG) approaches double the scan time. We propose to combine an alternating-polarity acquisition scheme for multi-echo MRI with a low-resolution fieldmap based novel distortion correction algorithm that can correct singularities in half the scan time of RG and enhance SNR while preserving edges. We show several ex vivo corrected results and demonstrate generalizability to in vivo MRI.
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