Keywords: Shims, Shims
Motivation: Multicoil B0 shimming improves signal quality in many MRI applications but either requires pre-calibrated ridged shim coils or lengthy coil re-calibration scans.
This has precluded the use of flexible arrays and limited body applications.
Goal(s): Accelerate B0 shim coil re-calibration to enable body-conforming flexible shim coil arrays.
Approach: Field calibration is accelerated using physics-based reconstruction, interleaving few measured slices, and de-tangling contributions of simultaneously active shim coils.
Results: Measured data is used to demonstrate the effectiveness of shim field recovery from few-slice measurements, and simulation is used to demonstrate simultaneous multi shim coil calibration, resulting in a 6.7x total acceleration.
Impact: Physics-based reconstruction of coil fields from few interleaved slices, and detangling fields from simultaneous B0 shim coil activation, achieves rapid calibration. Fast subject-specific calibration will enable the use of body-conforming, flexible B0 shim arrays.
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