Abstract #1808

New tuHDC BST-BT Ceramics with Optimal Permittivity Greatly Improve B1 efficiency and SNR at Room Temperature for 17O MRSI Application at 10.5T

Hannes Michel Wiesner¹, Xiao-Hong Zhu¹, Maryam Sarkarat², Xin Li¹, Matt Waks¹, Michael T. Lanagan², Qing X. Yang³, and Wei Chen¹

¹CMRR, Department of Radiology, University of Minnesota, Minneapolis, MN, United States, ²Department of Engineering, Pennsylvania State College of Engineering, University Park, PA, United States, ³CNMRR, Department of Neurosurgery, Penn State University, Hershey, PA, United States

Recently we reported that the ceramics made of composite BST (Ba_0.6Sr_0.4TiO₃) material have an extremely high tunability of relative permittivity when changing the ceramic temperature; and by cooling the ceramics to 14-15 °C, they provided the best improvement for ¹⁷O MRSI application at 10.5T, resulting in an optimal permittivity of ~6000. In this study, we developed new ceramic disks made of mixed Ba_0.6Sr_0.4TiO₃ and BaTiO₃ (BST-BT) materials to achieve the optimal permittivity at room temperature. The results indicate that unprecedented performance is possible for ¹⁷O MRSI application at 10.5T without the need of a temperature controller.

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