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Abstract #4081

The manipulation of displacement current wave in ultra-High Dielectric Constant Helmet on B1 field distribution in human head at 3T

Navid Pourramzangandji1, Christopher Sica2, Sebastian Rupprecht3, Michael Lanagan4, and Qing Yang1
1Department of Neurosurgery, PennState University College of Medicine, Hershey, PA, United States, 2Department of Radiology, PennState University College of Medicine, Hershey, PA, United States, 3HyQ research Solution, State College, PA, United States, 4Department of Engineering Science and Mechanics, Pennsylvania State University, State College, PA, United States

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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