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Abstract #2689

Correcting B0 Induced Signal Loss using Echo Planar Imaging Reference Data

Dan Xu1, Joe K. Maier, Kevin F. King1, Gaohong Wu

1Applied Science Laboratory, GE Healthcare, Waukesha, WI, United States

B0 inhomogeneity can lead to significant signal loss especially for slices far off isocenter and/or pulse sequences with spectral spatial fat suppression pulses. Collecting B0 map on a per-subject basis is impractical because of the prolonged scan time. In this paper, we propose a method to estimate and correct the per-slice B0 offset using the freely available echo planar imaging (EPI) reference data. Spin echo EPI results on a phantom show that the method can increase the signal for slices 15 cm away from isocenter from 37% to over 75% as compared to signal at the isocenter slice.