Document Detail

Transparent thin shield for radio frequency transmit coils.
MedLine Citation:
PMID:  24862451     Owner:  NLM     Status:  Publisher    
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.
Debra S Rivera; Jessica Schulz; Thomas Siegert; Verena Zuber; Robert Turner
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-5-27
Journal Detail:
Title:  Magma (New York, N.Y.)     Volume:  -     ISSN:  1352-8661     ISO Abbreviation:  MAGMA     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-5-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9310752     Medline TA:  MAGMA     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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