Motion-Compensated Slice-by-Slice ∆B0 Shimming with an AC/DC Shim Coil and Dual-Echo vNavs

Subject motion results in intra-scan ∆B0 changes which are uncompensated in conventional ∆B0 shimming methods. Rapidly switchable shim currents and ∆B0 vNavigators together enable motion-compensated shimming. We have demonstrated successful measurement, calculation, and application of motion-compensated slice-by-slice shims using and AC/DC coil and vNav ∆B0 maps. Motion-compensated slice-by-slice homogeneity shimming improves shim robustness to subject motion and enables compatibility with changing slice prescriptions of prospective motion correction.