NDLI: High- <inline-formula> <tex-math notation=TeX>$T_{rm c}$</tex-math></inline-formula> SQUID vs. Low- <inline-formula> <tex-math notation=TeX>$T_{rm c}$</tex-math></inline-formula> SQUID-Based Recordings on a Head Phantom: Benchmarking for Magnetoencephalography

Content Provider	IEEE Xplore Digital Library
Author	Xie, M. Schneiderman, J.F. Chukharkin, M.L. Kalabukhov, A. Whitmarsh, S. Lundqvist, D. Winkler, D.
Copyright Year	2002
Abstract	We explore the potential that high critical-temperature (high-T_c) superconducting quantum interference device (SQUID) technology has for magnetic recordings of brain activity, i.e., magnetoencephalography (MEG). To this end, we performed series of benchmarking experiments to directly compare recordings with a commercial (low-T_c SQUID-based) 306-channel MEG system (Elekta Neuromag TRIUX, courtesy of NatMEG) and a single channel high-T_c SQUID system. The source on which we recorded is a head phantom including 32 artificial current dipoles housed inside a half-spherical shell (courtesy Elekta Oy) for calibrating MEG systems. The high-T_c SQUID magnetometer consisted of a single layer YBa₂Cu₃O_7-x (YBCO) film on a 10 mm × 10 mm bicrystal substrate with a magnetic field sensitivity of ~40 fT/√Hz down to 10 Hz. We recorded serial activations eight tangential current dipoles located at different depths from the surface of the head phantom. Results indicate that our individual high-T_c SQUID demonstrated signal-to-noise ratios (SNRs) about 7-14 times lower than that of similarly-positioned low-T_c SQUIDs in a commercial MEG system. Only considering single-channel SNR, high-T_c SQUIDs with resolution better than fT/√Hz would be required to outperform the low-T_c system for shallow dipole sources. This work demonstrates a proof of principle study for future multichannel high-T_c MEG system development.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	782036
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phantoms SQUIDs Magnetic field measurement Magnetoencephalography Magnetometers Magnetic sensors Yttrium barium copper oxide Benchmark testing dc-SQUIDs High-temperature superconductors high-temperature superconductors magnetoencephalography
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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