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Chin. Phys. B, 2011, Vol. 20(4): 047401    DOI: 10.1088/1674-1056/20/4/047401

Characteristic parameters of electromagnetic signals from a human heart system

Liu Xin-Yuan(刘新元)a)†, Pei Liu-Qing(裴留庆) b), Wang Yin(王寅)a), Zhang Su-Ming(张素明)a), Gao Hong-Lei(高红蕾)a), and Dai Yuan-Dong(戴远东)c)
a School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China; b College of Information Science and Technology, Beijing Normal University, Beijing 100875, China; c State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Physics School of Peking University, Beijing 100871, China
Abstract  The electromagnetic field of a human heart system is a bioelectromagnetic field. Electrocardiography (ECG) and magnetocardiography (MCG) are both carriers of electromagnetic information about the cardiac system, and they are nonstationary signals. In this study, ECG and MCG data from healthy subjects are acquired; the MCG data are captured using a high-Tc radio frequency superconducting quantum interference device (HTc rf SQUIDs) and the QRS complexes in these data are analysed by the evolutionary spectrum analysis method. The results show that the quality factor Q and the central frequency fz of the QRS complex evolutionary spectrum are the characteristic parameters (CHPs) of ECG and MCG in the time-frequency domain. The confidence intervals of the mean values of the CHPs are estimated by the Student t distribution method in mathematical statistics. We believe that there are threshold ranges of the mean values of Q and fz for healthy subjects. We have postulated the following criterion: if the mean values of CHPs are in the proper ranges, the cardiac system is in a normal condition and it possesses the capability of homeostasis. In contrast, if the mean values of the CHPs do not lie in the proper ranges, the homeostasis of the cardiac system is lacking and some cardiac disease may follow. The results and procedure of MCG CHPs in the study afford a technological route for the application of HTc rf SQUIDs in cardiology.
Keywords:  bioelectromagnetic field      magnetocardiography      electrocardiography      characteristic parameters      threshold ranges  
Received:  20 July 2010      Revised:  08 December 2010      Accepted manuscript online: 
PACS:  74.90.+n (Other topics in superconductivity)  
  87.90.+y (Other topics in biological and medical physics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 607710003).

Cite this article: 

Liu Xin-Yuan(刘新元), Pei Liu-Qing(裴留庆), Wang Yin(王寅), Zhang Su-Ming(张素明), Gao Hong-Lei(高红蕾), and Dai Yuan-Dong(戴远东) Characteristic parameters of electromagnetic signals from a human heart system 2011 Chin. Phys. B 20 047401

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