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Abstract #4892

RF safety evaluation of different configurations of high-permittivity pads used to improve imaging of the cerebellum at 7 Tesla

Andreas K. Bitz 1,2 , Oliver Kraff 2 , Stephan Orzada 2 , Tim Herrmann 3 , Johannes Mallow 3 , Johannes Bernarding 3 , and Mark E. Ladd 1,2

1 Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2 Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany, 3 Department of Biometrics and Medical Informatics, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany

Dielectric pads with high permittivity can be used to improve image quality in UHF brain imaging. To achieve this, the positions of the pads have to be optimized individually for each examination, leading to different configurations which need to be analyzed w.r.t. RF safety. Therefore, detailed RF exposure analysis based on RF simulations has been performed to check whether the maximum permissible input power of the Tx coil needs to be readjusted. Results show that the SAR distribution is influenced by the high-permittivity pads and depends on their size and orientation. For certain configurations, a significant SAR elevation was found.

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