Abstract #4082

The displacement current wave on a high dielectric constant (HDC) helmet and its effect on B1 Field at 10.5 T (447 MHz)

Navid Pourramzangandji¹, Sebastian Rupprecht², Myung-Kyun Woo³, Michael Lanagan⁴, Bei Zhang⁵, Riccardo Lattanzi⁵, Russell L. Lagore³, Jerahmie Radder³, Gregor Adriany³, Brian Rutt⁶, Kamail Ugurbil³, and Qing Yang¹

¹Department of Neurosurgery, PennState University College of Medicine, Hershey, PA, United States, ²HyQ research Solution, State College, PA, United States, ³Department of Radiology, Center for Magnetic Resonance, University of Minnesota Research, Minneapolis, MN, United States, ⁴Department of Engineering Science and Mechanics, Pennsylvania State University, State College, PA, United States, ⁵Department of Neurosurgery, The Bernard and Irene Schwartz Center for Biomedical Imaging, New York University, New York, NY, United States, ⁶Radiology, Stanford University, Stanford, CA, United States

We observed a propagating wave of displacement current on a continuous high dielectric constant (HDC) helmet at 10.5T with an eight channel dipole array in CP mode. As a secondary current source of B1, the distribution and phase retardation of the displacement wave on the helmet leads to an interesting problem for utilizing HDC material for B1 enhancement. We extracted the B1+ field originated by the HDC helmet by subtracting the primary field (within the human head model without helmet) from the total field (field in the presence of the helmet).

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