Baseline optimization of SQUID gradiometer for magnetocardiography

SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements.An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance.By placing several magnetometers at different heights along the vertical direction,we could simult...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 2; pp. 471 - 473
Main Author 李华 张树林 邱阳 张永升 张朝祥 孔祥燕 谢晓明
Format Journal Article
LanguageEnglish
Published 01.02.2015
Subjects
Cancellation
Magnetic measurements
Magnetocardiography
Noise levels
Optimization
Performance indices
Placing
SQUID
SQUIDs
Superconducting quantum interference devices
优化
噪声消除
基线
性能指数
梯度仪
生物磁
磁场测量
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/2/028501

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Summary:SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements.An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance.By placing several magnetometers at different heights along the vertical direction,we could simultaneously obtain the synthetic gradiometers with different baselines.By using the traditional signal-to-noise ratio（SNR） as a performance index,we successfully obtain an optimal baseline for the magnetocardiography（MCG） measurement in a magnetically shielded room（MSR）.Finally,we obtain an optimal baseline of 7 cm and use it for the practical MCG measurement in our MSR.The SNR about 38 dB is obtained in the recorded MCG signal.
Bibliography:SQUID, gradiometer, baseline optimization, magnetocardiography
Li Hua, Zhang Shu-Lin, Qiu Yang, Zhang Yong-Sheng, Zhang Chao-Xiang, Kong Xiang-Yan, and Xie Xiao-Ming（ a） State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology （SIMIT）, Chinese Academy of Sciences （CAS）, Shanghai 200050, China; b） Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration Between CAS-Shanghai, Shanghai 200050, People＇s Republic of China and FZJ, D-52425 Julich, Germany; c） University of Chinese Academy of Sciences, Beijing 100049, China
SQUID gradiometer techniques are widely used in noise cancellation for biomagnetic measurements.An appropriate gradiometer baseline is very important for the biomagnetic detection with high performance.By placing several magnetometers at different heights along the vertical direction,we could simultaneously obtain the synthetic gradiometers with different baselines.By using the traditional signal-to-noise ratio（SNR） as a performance index,we successfully obtain an optimal baseline for the magnetocardiography（MCG） measurement in a magnetically shielded room（MSR）.Finally,we obtain an optimal baseline of 7 cm and use it for the practical MCG measurement in our MSR.The SNR about 38 dB is obtained in the recorded MCG signal.
11-5639/O4
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/2/028501