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

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Pohmann,  R
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Former Department MRZ, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society;

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Citation

Hoffmann, J., Mirkes, C., Shajan, G., Scheffler, K., & Pohmann, R. (2014). A 3-Port Traveling-Wave Antenna in Combination with TIAMO for the Acquisition of Void-Free Brain Images at 9.4 Tesla. Talk presented at Joint Annual Meeting ISMRM-ESMRMB 2014. Milano, Italy.


Cite as: https://hdl.handle.net/21.11116/0000-0001-33F0-6
Abstract
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.