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iPRES(N)-A shim optimization method. An 8-channel iPRES(2)-A coil array is shown for simplicity, but extension to any N value is straightforward. A shim optimization is first performed for an equivalent iPRES(N) coil array (step 1), which is then used to determine the optimal switch states (step 2) and DC currents (step 3) to apply in the iPRES(N)-A coil array.
