An integrated parallel reception, excitation, and shimming coil array with N DC shim loops within each RF coil, termed iPRES(N), improves the shimming of local B0 inhomogeneities relative to the original iPRES design with one loop per coil, but requires N times more power supplies which adds complexity and cost. A new adaptive iPRES design is proposed that uses bipolar junction transistors to generate different DC current paths, and hence different B0 fields for local shimming, within each coil using one power supply per coil, thus maintaining the shimming flexibility of iPRES(N) while reducing the number of power supplies.
