Abstract #0195

Transmit Performance of a Metamaterial Slab as a Passive RF Shimming Element for 3T MRI

Léo Rémillard¹, Adam Mitchell Maunder^1,2, Ashwin Iyer¹, and Nicola De Zanche^2,3

¹Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada, ²Oncology, University of Alberta, Edmonton, AB, Canada, ³Medical Physics, Cross Cancer Institute, Edmonton, AB, Canada

Synopsis

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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