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  Transparent thin shield for radio frequency transmit coils

Strick, D., Schulz, J., Siegert, T., Zuber, V., & Turner, R. (2015). Transparent thin shield for radio frequency transmit coils. Magnetic Resonance Materials in Physics, Biology and Medicine, 28(1), 49-56. doi:10.1007/s10334-014-0448-1.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-935F-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-7999-9
Genre: Journal Article

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 Creators:
Strick, Deborah1, Author              
Schulz, Jessica1, Author              
Siegert, Thomas1, Author              
Zuber, Verena2, 3, 4, Author
Turner, Robert1, Author              
Affiliations:
1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              
2NORMENT, KG Jebsen Centre for Psychosis Research, Institute of Clinical Medicine, University of Oslo, Norway, ou_persistent22              
3Division of Mental Health and Addiction, Oslo University Hospital, Norway, ou_persistent22              
4Prostate Cancer Research Group, Centre for Molecular Medicine Norway, Nordic EMBL Partnership, University of Oslo and Oslo University Hospital, Norway, ou_persistent22              

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Free keywords: Instrumentation; Neuroimaging; Magnetic resonance imaging; Optical motion tracking
 Abstract: OBJECTIVE: To identify a shielding material compatible with optical head-motion tracking for prospective motion correction and which minimizes radio frequency (RF) radiation losses at 7 T without sacrificing line-of-sight to an imaging target. MATERIALS AND METHODS: We evaluated a polyamide mesh coated with silver. The thickness of the coating was approximated from the composition ratio provided by the material vendor and validated by an estimate derived from electrical conductivity and light transmission measurements. The performance of the shield is compared to a split-copper shield in the context of a four-channel transmit-only loop array. RESULTS: The mesh contains less than a skin-depth of silver coating (300 MHz) and attenuates light by 15 %. Elements of the array vary less in the presence of the mesh shield as compared to the split-copper shield indicating that the array behaves more symmetrically with the mesh shield. No degradation of transmit efficiency was observed for the mesh as compared to the split-copper shield. CONCLUSION: We present a shield compatible with future integration of camera-based motion-tracking systems. Based on transmit performance and eddy-current evaluations the mesh shield is appropriate for use at 7 T.

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Language(s): eng - English
 Dates: 2014-04-272013-10-232014-04-302014-05-272015-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s10334-014-0448-1
PMID: 24862451
Other: Epub 2014
 Degree: -

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Title: Magnetic Resonance Materials in Physics, Biology and Medicine
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 28 (1) Sequence Number: - Start / End Page: 49 - 56 Identifier: ISSN: 0968-5243
CoNE: https://pure.mpg.de/cone/journals/resource/954926245532