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Motion-Compensated Slice-by-Slice ΔB0 Shimming with an AC/DC Shim Coil and Dual-Echo vNavs
Nicolas Sebastian Arango1, Robert Frost2,3, Paul Wighton2
1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States.
None:
Subject motion results in intra-scan ΔB0 changes which are uncompensated in conventional ΔB0 shimming methods. Rapidly switchable shim currents and ΔB0 vNavigators together enable motion-compensated shimming. We have demonstrated successful measurement, calculation, and application of motion-compensated slice-by-slice shims using an AC/DC coil and vNav ΔB0 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.
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