At higher static magnetic field strengths (3T) characteristic regions of low transmit fields occur that degrade the quality and diagnostic efficacy of MRI. Here we present the design, simulation, and measurement of thin (2cm), lightweight metamaterial (MTM) slabs for 3T that manipulate the field produced by a birdcage (BC) volume resonator for improved transmit performance. In a torso-sized phantom, a measured 39% increase in the mean flip angle and 4.9% reduction in the percent coefficient of variation was found, while the specific absorption rate normalized to the mean transmit field was reduced by 32%.
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