Radiofrequency antenna helmet array for thermal magnetic resonance of brain tumours at 297 MHz

Item Type:	Conference or Workshop Item
Title:	Radiofrequency antenna helmet array for thermal magnetic resonance of brain tumours at 297 MHz
Creators Name:	Rahimi, F. and Berangi, M. and Eigentler, T.W. and Nurzed, B. and Millward, J.M. and Schuhmann, R. and Niendorf, T.
Abstract:	Thermal magnetic resonance (Thermal MR) 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 Themal MR. Recognizing this opportunity 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. A 10-channel helmet RF applicator was designed for Thermal MR, evaluated in EMF simulations and benchmarked against an annular RF array using the same number of RF-elements. Our phantom studies demonstrate that the helmet RF applicator affords an ~10%- 30% improvement in maximum SAR10g in the TV over the conventional annular RF array. Our preliminary findings obtained for the human head voxel model Duke show improved target coverage of high SAR10g for the helmet RF applicator.
Keywords:	Radio Frequency, Performance Evaluation, Head, TV, Applicators, Magnetic Resonance, Safety
Source:	2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)
Title of Book:	2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)
ISBN:	978-9-4639-6-8058
Publisher:	IEEE
Page Range:	1-3
Date:	6 July 2022
Official Publication:	https://doi.org/10.23919/at-ap-rasc54737.2022.9814432

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