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Abstract #1130

Shape-Optimization of Electric Dipoles for Human Head Imaging at 7 Tesla

Ian Robert Oliphant Connell1,2 and Ravi S Menon1,2

1Centre for Functional and Metabolic Mapping, Robarts Research Institute, London, ON, Canada, 2Medical Biophysics, University of Western Ontario, London, ON, Canada

Dipole antennae have been proposed as an alternative solution for RF transmission at ultra-high field (UHF) strengths. However, adapting dipoles to achieve self-resonance, while minimizing SAR for a given transmission field homogeneity, is challenging given the geometry of the human head. In this study, the design of dipole elements is performed via computer aided shape optimization and is demonstrated to meet several of these design parameters. The final design relies upon meandered-conductor paths to produce electromagnetic fields that minimize local SAR without the use of additional RF shimming or pulse design algorithms.

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