Baseline optimization of SQUID gradiometer for magnetocardiography  

作　　者：李华 张树林 邱阳 张永升 张朝祥 孔祥燕 谢晓明 

机构地区：[1]State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology(SIMIT),Chinese Academy of Sciences(CAS) [2]Joint Research Laboratory on Superconductivity and Bioelectronics,Collaboration Between CAS-Shanghai [3]University of Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第2期471-473,共3页中国物理B（英文版）

基　　金：supported by the "Strategic Priority Research Program(B)"of the Chinese Academy of Sciences(Grant No.XDB04020200);the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KGCX2-EW-105)

摘　　要：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.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.

关 键 词：SQUID GRADIOMETER baseline optimization MAGNETOCARDIOGRAPHY 

分 类 号：O441[理学—电磁学]