A displacement current wave is formed in an ultra-high dielectric constant (uHDC) helmet, which perturbs transmission B1 field uniformity within the human head as a result of phase retardation. With computer modeling, we manipulated the displacement current by segmenting the helmet into multiple pieces to control the propagation of the induced displacement current wave to “shim” the B1 field inside a human head model. We demonstrated that with a 4-segmented helmet, we can obtain a uniform B1+ distribution within the human brain with enhanced transmit efficiency.
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