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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