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Abstract #4279

Evaluation of Egyptian axe dipole antenna as an array element for head imaging at 7T MRI

Irena Zivkovic1, Thomas O'Reilly1, Wyger Brink1, and Andrew Webb1

1Radiology Department, C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands

In this abstract we propose a new antenna design as a transmit array element for proton head imaging at 7T that combines a small feeding dipole that is capacitively coupled, as a so-called ‘indirect’ or ‘passive’ feed, to an ‘Egyptian’ axe dipole. B1+ and SAR efficiency of the proposed antenna have been compared numerically with a conventional dipole antenna of the same length. A head array consisting of eight antenna elements has been constructed and tested. This array element offers a large reduction in SAR compared to equally sized linear dipoles while maintaining their B1+ profile as well as reducing the impact of antenna loading on the resonance frequency.

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