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The multi-coil (MC) technique utilizing a set of individually driven non-specific coils outperforms traditional spherical harmonics B0 shimming in rodent and human brains. MC designs consisting of dedicated MC elements have shown the best shim performance, while designs utilizing a DC current on the RD coil of RF coil arrays have slightly lower performance but need significantly less physical space. Here, we optimized the number, size and placement of dedicated MC elements to be used in combination with RF-DC coils in a hybrid MC shim system for B0 shimming of the human brain in a clinical 3 T MR scanner.
Theilenberg et al. (Wed,) studied this question.