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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