Dynamic shimming compared to global shimming improves B0 homogeneity over whole brain. However, typical shim optimization could result in high currents, particularly for small volume, e.g. small slab or slice. To address this we investigated the extent to which large reductions in aggregate shim current could be achieved through constrained optimization at 7T. We also investigated the extent to which alternate imaging orientation could improve homogeneity. The results show constrained optimization can provide robust shimming at substantially reduced aggregate current values, and angulated imaging improved shimming condition. The proposed methods enhanced multi-slice imaging by reducing both susceptibility-induced signal losses and distortions.
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