Abstract #5073

Helmet RF Applicator for Enhancing Focal RF Power Deposition in Thermal Magnetic Resonance of the Brain at 7T

Faezeh Rahimi^1,2, Thomas Wilhelm Eigentler^1,3, Jason M. Millward^1,4, Pirus Ghadjar⁵, and Thoralf Niendorf^1,4,6

¹Berlin Ultrahigh Field Facility, Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ²Theoretische Elektrotechnik Institut Hochfrequenz- und Halbleiter-Systemtechnologien, Technische Universität Berlin, Berlin, Germany, ³Chair of Medical Engineering, Technische Universität Berlin, Berlin, Germany, ⁴a joint cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine, Berlin, Germany, ⁵Clinic for Radiation Oncology, Charite’ Universitätsmedizin, Berlin, Germany, ⁶MRI.TOOLS GmbH, Berlin, Germany

Synopsis

Keywords: RF Arrays & Systems, Interventional Devices, SAR distribution, Focal Heating, Hyperthermia, Brain Thermal MR at 7TThermal Magnetic Resonance (ThermalMR) uses an RF-applicator to add a thermal intervention dimension to a diagnostic imaging device. Optimizing the performance of RF applicator configurations can eventually improve the performance of ThemalMR. This work examines the feasibility of multi-channel RF applicators using broadband Self-Grounded Bow-Tie (SGBT)antenna building blocks. The focus is on enhancing focal RF power deposition in a target volume by using a multi-channel helmet RF array configuration versus conventional annular RF arrays. Our preliminary findings obtained for the human head voxel model Duke show improved target coverage of high SAR_10g and high temperature for the helmet configuration.

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