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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