Fast, automatic shimming by mapping along projections (FASTMAP) is an elegant analytical method developed to quantify 3-dimensional first and second order spherical harmonic B0 shapes along six 1-dimensional column projections. The straightforward application of this theoretical concept to B0 shimming, however, neglects crucial aspects of sequence implementation and shim hardware, commonly necessitating multi-step iterative adjustments. Considering experimental imperfections of the employed B0 mapping and shim coil hardware, we demonstrate optimal single-step adjustment of first and second order terms (with potential <3% refinement of linear terms) in the anterior cingulate cortex, one of the most difficult-to-shim areas in the human brain.
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