MRI at high and ultra high field strengths suffers from B1+ inhomogeneities, but B1+ shimming with multiple transmit coils is only available at top-line scanners. Dielectric pads allow for localized B1+ changes, but need to be specifically designed for the scan and anatomy. In this work we explore the use of an actively switchable dielectric device to allow for spatial B1+ correction without the need for multiple transmit coils. Our phantom experiments at 3T show that coupling mini-pockets with barium titanate slurry enables various field configurations that are switchable, localized and significant in magnitude.
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