Low-Tc direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

doi:10.1088/1674-1056/24/7/078501

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 78501-078501.doi: 10.1088/1674-1056/24/7/078501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

邱阳^{a b c}, 李华^{a b c}, 张树林^{a b}, 王永良^{a b}, 孔祥燕^{a b}, 张朝祥^{a b}, 张永升^{a b}, 徐小峰^{a b}, 杨康^{a b c}, 谢晓明^{a b}

a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between Chinese Academy of Sciences-Shanghai, Shanghai 200050, China and FZJ, D-52425 Julich, Germany;
c University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2015-01-12 修回日期:2015-02-09 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by "One Hundred Persons Project" of the Chinese Academy of Sciences and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

Qiu Yang (邱阳)^{a b c}, Li Hua (李华)^{a b c}, Zhang Shu-Lin (张树林)^{a b}, Wang Yong-Liang (王永良)^{a b}, Kong Xiang-Yan (孔祥燕)^{a b}, Zhang Chao-Xiang (张朝祥)^{a b}, Zhang Yong-Sheng (张永升)^{a b}, Xu Xiao-Feng (徐小峰)^{a b}, Yang Kang (杨康)^{a b c}, Xie Xiao-Ming (谢晓明)^{a b}

a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
b Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between Chinese Academy of Sciences-Shanghai, Shanghai 200050, China and FZJ, D-52425 Julich, Germany;
c University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-01-12 Revised:2015-02-09 Online:2015-07-05 Published:2015-07-05
Contact: Kong Xiang-Yan E-mail:xykong@mail.sim.ac.cn
Supported by:
Project supported by "One Hundred Persons Project" of the Chinese Academy of Sciences and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04020200).

摘要/Abstract

摘要： We constructed a 36-channel magnetocardiography (MCG) system based on low-T_c direct current (DC) superconducting quantum interference device (SQUID) magnetometers operated inside a magnetically shielded room (MSR). Weakly damped SQUID magnetometers with large Steward–McCumber parameter β_c (β_c ≈ 5), which could directly connect to the operational amplifier without any additional feedback circuit, were used to simplify the readout electronics. With a flux-to-voltage transfer coefficient ∂V/∂Ø larger than 420 μV/Ø₀, the SQUID magnetometers had a white noise level of about 5.5 fT·Hz^-1/2 when operated in MSR. 36 sensing magnetometers and 15 reference magnetometers were employed to realize software gradiometer configurations. The coverage area of the 36 sensing magnetometers is 210× 210 mm². MCG measurements with a high signal-to-noise ratio of 40 dB were done successfully using the developed system.

关键词: superconducting quantum interference devices, magnetometer, magnetocardiography, noise cancellation

Abstract: We constructed a 36-channel magnetocardiography (MCG) system based on low-T_c direct current (DC) superconducting quantum interference device (SQUID) magnetometers operated inside a magnetically shielded room (MSR). Weakly damped SQUID magnetometers with large Steward–McCumber parameter β_c (β_c ≈ 5), which could directly connect to the operational amplifier without any additional feedback circuit, were used to simplify the readout electronics. With a flux-to-voltage transfer coefficient ∂V/∂Ø larger than 420 μV/Ø₀, the SQUID magnetometers had a white noise level of about 5.5 fT·Hz^-1/2 when operated in MSR. 36 sensing magnetometers and 15 reference magnetometers were employed to realize software gradiometer configurations. The coverage area of the 36 sensing magnetometers is 210× 210 mm². MCG measurements with a high signal-to-noise ratio of 40 dB were done successfully using the developed system.

Key words: superconducting quantum interference devices, magnetometer, magnetocardiography, noise cancellation

中图分类号: (Superconducting quantum interference devices (SQUIDs))

85.25.Dq

07.55.Ge (Magnetometers for magnetic field measurements) 87.85.Pq (Biomedical imaging) 43.50.+y (Noise: its effects and control)

邱阳, 李华, 张树林, 王永良, 孔祥燕, 张朝祥, 张永升, 徐小峰, 杨康, 谢晓明. Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room[J]. 中国物理B, 2015, 24(7): 78501-078501.

Qiu Yang (邱阳), Li Hua (李华), Zhang Shu-Lin (张树林), Wang Yong-Liang (王永良), Kong Xiang-Yan (孔祥燕), Zhang Chao-Xiang (张朝祥), Zhang Yong-Sheng (张永升), Xu Xiao-Feng (徐小峰), Yang Kang (杨康), Xie Xiao-Ming (谢晓明). Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room[J]. Chin. Phys. B, 2015, 24(7): 78501-078501.

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Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

Low-T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

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