Different B0 shim system designs are tested on two distinct fieldmap databases for assessment of commonly employed metrics for evaluation of B0 inhomogeneity mitigation. We verify that those metrics might not always be the best choice for performance analysis, as, for a same shim system, they may provide hardly comparable values across sites. We then propose a novel, simple and robust metric for shim system analysis, the Spherical Harmonic Rating, which is shown to provide consistent performance across sites, providing an equivalency of the shim system to a Spherical Harmonics basis.
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