Baseline optimization of SQUID gradiometer for magnetocardiographyProject supported by the "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences (Grant No. XDB04020200) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-EW-105)

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 sim...

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Bibliographic Details
Published in:Chinese physics B 2015-02, Vol.24 (2)
Main Authors: Li, Hua, Zhang, Shu-Lin, Qiu, Yang, Zhang, Yong-Sheng, Zhang, Chao-Xiang, Kong, Xiang-Yan, Xie, Xiao-Ming
Format: Article
Language:English
Subjects:
baseline optimization
gradiometer
magnetocardiography
SQUID
Online Access:Get full text
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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.
ISSN:1674-1056
DOI:10.1088/1674-1056/24/2/028501