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Abstract #1391

The Coax Dipole Antenna: a flexible, low SAR dipole antenna for body imaging at 7 Tesla.

Carel C. van Leeuwen1, Bart R.E. Steensma1, Dennis W.J. Klomp1, Cornelis A.T. van den Berg1, and Alexander J.E. Raaijmakers1,2
1University Medical Center Utrecht, Utrecht, Netherlands, 2Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

A coax cable dipole antenna with gaps in the shield supports flat current profiles on the outside of the shield. A simulation study is performed to further optimize the design of this flexible so-called ‘coax dipole antenna’. MR thermometry measurements are performed using a single antenna and a homogeneous phantom. The coax dipole antenna causes 18% lower peak heating than a fractionated dipole antenna. An array of eight coax dipole antennas is used to generate T2-weighted images and B1 maps of the prostate of three volunteers, where the coax dipoles achieve the same B1 as an array of fractionated dipoles.

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