An automatic off-resonance correction method for multi-slice imaging
Chen W, Meyer C
University of Virginia
Spiral off-resonance correction using field maps prolongs the scan time and can be unreliable when the maps themselves are corrupted by strong field inhomogeneity. Automatic off-resonance correction methods do not have these problems. However, automatic methods are prone to estimation error, especially at structure interfaces or regions with low signal. When applying automatic methods to multi-slice imaging, the field map can have large discontinuities in the slice direction due to estimation error. Using the continuity of the underlying field, we developed an automatic off-resonance correction method for multi-slice imaging with improved robustness compared to existing automatic methods.