Low-to-mid field systems have nearly been abandoned for high-field, high-performance systems. However, recent improvements in MR hardware, algorithms and computation are stimulating a resurgence in interest of upgrading lower-end magnets to achieve high-performance at significantly lower cost, improved accessibility, portability and siting. Here, we look at upgrading a wrist/animal 1T permanent-magnet system. We integrate a simple B0 array into a solenoid TRX coil for reducing B0 through localized targeted shimming. We demonstrate potential for improved field homogeneity with simulations, and demonstrate homogeneity improvements using a 6-channel prototype array with negligible effects on the transmit field and received SNR.
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