For a rigidly positioned ∆B0 shim coil, calibration is a one-time process of acquiring high resolution ∆B0 fields. For subject-specific shim coil position, this approach is too slow. We propose a fast magnetostatic inverse approach for subject-specific calibration by only acquiring few, low resolution fieldmaps each with several active shim coils. Our simulation study, which included a noise model and a measured ∆B 0 test case, suggests a scan-time reduction of afactor of 170, reducing calibration time from over an hour to less than a minute with negligible impact on shim quality.
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