FSE Cusp artifact removal using novel saturation method

FSE cusp artifacts are caused by collective effects of the gradient non-linearity and B0 inhomogeneity in regions distant from the magnet center. This can present as the so-called feather-like artifacts associated with sagittal plane FSE images when the phase encoding is along the S/I direction. We propose a simple yet effective method to eliminate the root cause of the artifacts by spatial saturation and further improve its practical implementation to reduce total RF bandwidth and overall SAR with two-stage saturation: frequency saturation and special saturation.

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