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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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