Abstract #4281

One for all: Ultra-wideband (279-500MHz) self-grounded bow-tie antenna for ultrahigh-field and thermal MR

Lukas Winter¹, Hana Dobšíček Trefná², Yiyi Ji¹, Till Huelnhagen¹, and Thoralf Niendorf^1,3,4

¹Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, ²Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden, ³Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine, Berlin, Germany, ⁴MRI.TOOLS GmbH, Berlin, Germany

A compact self-grounded ultra-wideband bow-tie antenna is presented that operates in a frequency range from 279 MHz (¹⁹F at 7.0 T) up to 500 MHz (¹H at 11.7 T). The antenna is smaller and lighter than previous designs making it an excellent candidate for high density multi-channel transmit/receive arrays. It can be driven directly at 50Ω eliminating the need for a tuning/matching circuit and associated component losses and costs. The ultra-wideband antenna was tested successfully in-vivo at 7.0 T for ¹⁹F and ¹H imaging. Its design supports high average power applications such as targeted RF heating or thermal MR.

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