Abstract #1568

Effect of high dielectric constant material configurations on the transmission field of an 8-channel dipole array at 10.5 T (447 MHz)

Navid PourramzanGandji¹, Sebastian Rupprecht¹, Michael Lanagan², Bei Zhang³, Riccardo Lattanzi³, Russell L. Lagore⁴, Jerahmie Radder⁴, Gregor Adriany⁴, Kamil Ugurbil⁴, and Qing X Yang¹

¹Pennsylvania State University, College of Medicine, Hershey, PA, United States, ²Department of Engineering Science and Mechanics, Pennsylvania State University, State college, PA, United States, ³Department of Radiology, The Bernard and Irene Schwartz Center for Biomedical Imaging, New York University, New York, NY, United States, ⁴Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

We used numerical simulations to investigate the effect of high dielectric constant materials (HDCM) on the performance of a transmit array with 8 dipole antennas for 10.5 T head MRI. Several parameters, including B1+ transmit efficiency, coupling between each array elements, and Specific Absorption Rate (SAR), were evaluated in the presence of HDCM with various relative permittivity values. We show that employing HDCM can decrease the coupling between each adjacent element by 16%, increase B1+ efficiency by more than 30% and lower total SAR by 40%.

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