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Abstract #0782

Lipid Artifact Removal by Dynamic Shimming (LARDS) with multi-coil B0 shim arrays

Jinmin Xu1,2, Nicolas Arango2, Congyu Liao2,3, Berkin Bilgic2,3, Zijing Zhang1,2, Lawrence L Wald2,3, Setsompop Kawin2,3, Huafeng Liu1, and Jason P Stockmann2,3
1State key Laboratory of Modern Optical Science and Engineering, Zhejiang University, Hangzhou, China, 2A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 3Harvard Medical School, Boston, MA, United States

We show that a switched B0 offset field can be used to improve lipid suppression pulse performance in 2D imaging by pushing water and lipids apart in the frequency domain. The method is realized using multi-coil B0 shim arrays with rapidly switchable output currents that can be turned on during the lipid suppression pulse. Convex optimization is used to jointly solve for the shim currents and the lipid suppression pulse center frequency to optimize lipid suppression while minimize water signal loss. Applications to brain and body imaging are considered.

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