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  Human brain imaging at 9.4 T using a tunable patch antenna for transmission

Hoffmann, J., Shajan, G., Budde, J., Scheffler, K., & Pohmann, R. (2013). Human brain imaging at 9.4 T using a tunable patch antenna for transmission. Magnetic Resonance in Medicine, 69(5), 1494-1500. doi:10.1002/mrm.24367.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-B714-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1E3E-A
Genre: Journal Article

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 Creators:
Hoffmann, J1, 2, Author              
Shajan, G1, 2, Author              
Budde, J1, 2, Author              
Scheffler, K1, 2, Author              
Pohmann, R1, 2, Author              
Affiliations:
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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: For human brain imaging at ultrahigh fields, the traveling wave concept can provide a more uniform B1+ field over a larger field of view with improved patient comfort compared to conventional volume coils. It suffers, however, from limited transmit efficiency and receive sensitivity and is not readily applicable in systems where the radiofrequency shield is too narrow to allow for unattenuated wave propagation. Here, the near field of a capacitively adjustable patch antenna for excitation is combined with a receive-only array at 9.4 T. The antenna is designed in compact size and placed in close proximity to the subject to improve the transmit efficiency in narrow bores. Experimental and numerical comparisons to conventional microstrip arrays reveal improved B1+ homogeneity and longitudinal coverage, but at the cost of elevated local specific absorption rate. High-resolution functional and anatomical images demonstrate the use of this setup for in vivo human brain imaging at 9.4 T.

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 Dates: 2012-062013-05
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.24367
BibTex Citekey: HoffmannSBSP2012
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 69 (5) Sequence Number: - Start / End Page: 1494 - 1500 Identifier: -