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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

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. In Joint Annual Meeting ISMRM-ESMRMB 2014.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0001-33F0-6 Version Permalink: https://hdl.handle.net/21.11116/0000-0001-3731-A
Genre: Meeting Abstract

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http://www.ismrm.org/14/program_files/Session31.htm (Abstract)
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 Creators:
Hoffmann, Jens1, 2, Author           
Mirkes, C1, 2, Author           
Shajan, Gunamony1, 2, Author           
Scheffler, Klaus1, 2, Author           
Pohmann, R1, 2, Author           
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1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 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.

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 Dates: 2014-05
 Publication Status: Issued
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 Identifiers: BibTex Citekey: HoffmannMSSP2014
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Title: Joint Annual Meeting ISMRM-ESMRMB 2014
Place of Event: Milano, Italy
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Title: Joint Annual Meeting ISMRM-ESMRMB 2014
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 0399 Start / End Page: - Identifier: -