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Abstract #0399

A 3-Port Traveling-Wave Antenna in Combination with TIAMO for the Acquisition of Void-Free Brain Images at 9.4 Tesla

Jens Hoffmann 1,2 , Christian Mirkes 1,3 , G. Shajan 1 , Klaus Scheffler 1,3 , and Rolf Pohmann 1

1 High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tuebingen, BW, Germany, 2 Graduate School of Neural & Behavioural Sciences, Tuebingen, BW, Germany, 3 Department for Biomedical Magnetic Resonance, University of Tuebingen, Tuebingen, BW, Germany

Three waveguide modes propagate in a 9.4 T whole-body scanner compared to only two modes at 7 T. While three modes are still insufficient to homogenize the B1 field across larger volumes, a time-interleaved acquisition of two complementary RF shims (TIAMO) and the subsequent sum-of-squares reconstruction of the single images is suitable to achieve whole-brain coverage without signal dropouts. Using simulations, we show that excitation inhomogeneity (max-to-min ratio) can be reduced by a factor of 2 (4) compared to CP mode. Finally, void-free whole-brain traveling-wave MRI at 9.4 T is demonstrated in vivo using a compact, adjustable 3-port antenna.

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