The adaptive iPRES(N) coil design can effectively shim localized B0 inhomogeneities, while requiring one power supply per RF coil element and 4 MEMS switch packages to direct the DC current among the shim loops. Here, this design is improved by using only one 6-channel MEMS switch package per RF coil element and a SPI-interface to control all of them, which requires minimal space and a few command lines. In vivo experiments with an adaptive iPRES(2) body coil array demonstrated that it can reduce B0 inhomogeneities and EPI distortions more effectively than an iPRES(1) coil array, without requiring additional power supplies.
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