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Performance Characterization and Optimization of 36-channel Magnectocardiography System Based on LTc DC SQUID Magnetometers
Date: 2018/6/8             Browse: 105

Speaker:     Prof. Xiangyan KONG

Time:          13:30—14:20, June 8 

Location:    Room 1A-200, SIST Building


The SQUID-based biomagnetic measurement systems are widely used in the diagnosis of heart and brain diseases. In SIMIT, we set up the first multi-channel MCG system based on the weakly damped DC SQUID magnetometers with average field noise of 5 fT/?Hz. The system consists of 36 sensing magnetometers which mainly measure the cardiac magnetic field and several reference magnetometers which measure the environmental magnetic field, thus realizing software gradiometer configurations indifferent environments. The sensor coverage area of the 36 channels is 20′20 cm2 and the baseline of software gradiometer is 6 cm. The bandwidth of the magnetometers is larger than 3.6 kHz and the detective sensitivity of the magnetometers is lower than 0.05 pT. In addition, a new design of dewar insert with liquid nitrogen interlayer was adopted to prolong the duration of liquid helium. The average boil-off rate of liquid helium is 0.22 L/h with the system continuously running. MCG signal with SNR of 40 dB in different magnetic shielded rooms could be obtained from our system.


Xiangyan KONG received the Ph.D. degree from the Institute of Physics, Chinese Academy of Sciences, Beijing, China, in 2005. During 2005–2010, she was as a Postdoctoral Fellow with Osaka University, Toyonaka, Japan. She is currently a Professor with the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China. From March 2011, she is selected as CAS Hundred Talents professor and a supervisor for doctoral students. Her research interests are superconductive electronics including micro/nano superconducting devices and their low frequency applications. Her current research is related to superconducting quantum interference device (SQUID) and its applications in Biomag, NonDestructive Evaluation. She has published more than 30 first/corresponding-author papers in peer-reviewed academic journals and owns more than 20 patents. Now she is the advanced member of Chinese Institute of Electronics, member of National Technical Committee for standardization of superconductivity (SAC/TC265) and IEICE oversea member.

SIST-Seminar 18034