Keywords: Shims, Spectroscopy, brain, multi-coil shim array, EPI, distortion, simulation
Motivation: Interleaved MRI-MRS acquisition offers the potential to probe metabolite and haemodynamic responses, yet achieving optimal B0 shimming in both regions is challenging.
Goal(s): Evaluate the performance of weighted and dynamic B0 shimming using a multi-coil shim array.
Approach: A B0 shimming algorithm was developed, incorporating a multi-coil shim array together with spherical harmonics, to optimise homogeneity over a small volume and whole-brain, simultaneously. We demonstrate this using simulations developed from phantom and in vivo data.
Results: Weighted shimming with the multi-coil shim array improved homogeneity across several commonly measured brain regions and the whole brain relative to using spherical harmonics alone.
Impact: Weighted shimming improves homogeneity outside of small regions thus reducing artefacts for MRS. Dynamic shimming with the multi-coil shim array may allow for greater flexibility than updating spherical harmonics alone. This approach improves data quality using interleaved acquisition approaches.
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