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Abstract #4422

Self-Grounded Bow-Tie Antennas Placed Perpendicular to B0 in a Helmet RF Array Improve B1+ Uniformity for Brain MRI at 7.0T

Faezeh Rahimi1,2, Thomas Wilhelm Eigentler1,3, Bilguun Nurzed1, Jason M. Millward1,4, and Thoralf Niendorf1,4,5
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, 5MRI.TOOLS GmbH, Berlin, Germany

Synopsis

Keywords: RF Arrays & Systems, Modelling, Brain MRI, UHF MRI, PTx

UHF-MR uses RF arrays to shape the magnetic field generated inside the brain. For brain MRI at 7T, a helmet shaped transmit RF array could be beneficial versus conventional annular configurations. Recognizing this opportunity this work examines the feasibility of a multi-channel TX helmet RF applicator using broadband Self-Grounded Bow-Tie (bbSGBT) antenna building blocks. The focus is on enhancing B1+ uniformity and coverage for brain MRI at 7.0T. Our findings obtained for the human head voxel model Duke demonstrate improved mean B1+ coverage and increased B1+ uniformity for the helmet configuration.

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Abstract Presentation Video

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