Abstract #3526

Optimization of the antenna-subject spacing for transceive surface arrays of dipole antennas at 7T

A.A. Hurshkainen¹, I.J. Voogt², A.A. Haghnejad², D.W. Klomp², P.R. Luijten², I.V. Melchakova¹, S.B. Glybovski¹, C.A.T. van den Berg², and A.J.E. Raaijmakers²

¹Department of Nanophotonics and Metamaterials, ITMO University, Saint-Petersburg, Russian Federation, ²Imaging Division, UMC Utrecht, Utrecht, Netherlands

Dipole antennas are being used increasingly for body imaging at 7T. For dipole antennas, SAR levels can be reduced by increasing the antenna-subject spacing. However, this will increase inter-element coupling. In this study we investigate the relationship between antenna-subject spacing, inter-element coupling and maximum local SAR levels for fractionated dipole antennas. We demonstrate that the originally presented antenna-subject spacing (2 cm) can be increased without significant scattering losses. We have realized an 8-element array of fractionated dipole antennas with 4 cm antenna-subject spacing and demonstrate uncompromised imaging performance with 45% lower local SAR levels in comparison to the original design.

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