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Abstract #3663

Local SAR increase in the human head induced by high-permittivity pads at the sodium (23Na) resonance frequency at 7 Tesla

Thomas M. Fiedler1, Mark E. Ladd1,2, and Andreas K. Bitz1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany

It has been shown that specific configurations of high-permittivity pads can lead to an increase of local SAR. So far, the effects of high-permittivity pads on RF fields have been investigated only for 1H imaging at 7 Tesla. For X-nuclei imaging typically dual-tuned coils are applied. In this work, we investigate the effect of high-permittivity pads, typically utilized to optimize RF fields for 1H imaging, for 23Na imaging at 7T. RF simulations were performed for two body models to determine under which conditions SAR elevations are likely to occur or can be avoided.

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