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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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