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• W2028761323 abstract "Eddy currents induced by applied magnetic-field pulses have been a common issue in ultra-low-field magnetic resonance imaging. In particular, a relatively large prepolarizing field-applied before each signal acquisition sequence to increase the signal-induces currents in the walls of the surrounding conductive shielded room. The magnetic-field transient generated by the eddy currents may cause severe image distortions and signal loss, especially with the large prepolarizing coils designed for in vivo imaging. We derive a theory of eddy currents in thin conducting structures and enclosures to provide intuitive understanding and efficient computations. We present detailed measurements of the eddy-current patterns and their time evolution in a previous-generation shielded room. The analysis led to the design and construction of a new shielded room with symmetrically placed 1.6-mm-thick aluminum sheets that were weakly coupled electrically. The currents flowing around the entire room were heavily damped, resulting in a decay time constant of about 6 ms for both the measured and computed field transients. The measured eddy-current vector maps were in excellent agreement with predictions based on the theory, suggesting that both the experimental methods and the theory were successful and could be applied to a wide variety of thin conducting structures." @default.
• W2028761323 created "2016-06-24" @default.
• W2028761323 creator A5007892684 @default.
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• W2028761323 date "2014-03-11" @default.
• W2028761323 modified "2023-09-23" @default.
• W2028761323 title "Conductive shield for ultra-low-field magnetic resonance imaging: Theory and measurements of eddy currents" @default.
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• W2028761323 doi "https://doi.org/10.1063/1.4867220" @default.
• W2028761323 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3977756" @default.
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• W2028761323 hasPublicationYear "2014" @default.
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