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国家自然科学基金(607710003)

作品数:5 被引量:6H指数:2
相关作者:裴留庆刘新元戴远东王寅张素明更多>>
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心磁图与心电图的时-频域特性被引量:2
2010年
心磁图(MCG)与心电图(ECG)是心脏系统电磁信息的数据载体,它们都是非平稳信号,非平稳信号最根本和最关键的性质是它的时频局域特性.在满足时-频域不确定性原理条件下,进化谱能够很好地反映此类生命系统数据中的局部时-频域特性.通过对正常人MCG与ECG数据QRS波群的进化谱分析,得到了QRS波群的时-频域特征参数:品质因数Q和中心频率fz.实验数据分析结果表明,同一正常人MCG与ECG的特征参数具有一致性.从心脏系统动力学层次上,我们提出了QRS波群的时-频域特征参数Q和fz存在阈值范围的建议,当特征参数属于阈值范围时,蕴涵心脏系统具有自我调节稳态能力,属于正常状态;当特征参数小于阈值时,蕴涵心脏系统失去了稳态能力,心肌缺血比较严重或有其他早期心脏病.我们用不同类别心脏病态ECG样本数据对阈值范围的合理性进行了检验.结果表明,特征参数阈值范围概念是成立的,它不仅为ECG在临床诊断中提供了一种新的参考判据,也为MCG在心脏病医学中的应用提供了一种技术路线.
刘新元张素明王寅裴留庆戴远东
关键词:非平稳信号特征参数
Characteristics of magnetocardiography and electrocardiography in the time-frequency domain被引量:1
2011年
As the carriers of electromagnetic information about the cardiac system,both magnetocardiography(MCG) and electrocardiography(ECG) are non-stationary signals(NSS).The essential and crucial features of NSS are the local time-frequency characteristics(LTFCH).Under the constraint of the uncertainty principle in the time-frequency domain(TFD),the LTFCH of those non-stationary signals can be determined by evolutionary spectrum analysis(ESA).In this paper,by analyzing the QRS complexes of both MCG and ECG data from healthy volunteers,we have derived some characteristic parameters(CHPs) in the TFD,such as the quality factor(Q) and center frequency(fz).According to the experiment results,we believe that there are threshold ranges of Q and fz values in the dynamic behavior of the cardiac system for healthy projects.If the CHPs are in the proper ranges,the cardiac system is in a normal condition and homeostasis can be self-correcting.In contrast,if the values of the CHPs are less than the proper ranges,the homeostasis of the cardiac system is lost and some cardiac diseases may result.The assumption of the threshold ranges is verified by sample data from different cardiac diseases,and the results support the assumption.The CHPs are not only a kind of new reference criterion for ECG in clinical diagnosis,but also afford a technological route for the application of MCGs in cardiology.
LIU XinYuanPEI LiuQingZHANG SuMingWANG YinDAI YuanDong
关键词:时频域心脏健康非平稳信号电磁信息
Characteristic parameters of electromagnetic signals from a human heart system
2011年
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.
刘新元裴留庆王寅张素明高红蕾戴远东
关键词:MAGNETOCARDIOGRAPHYELECTROCARDIOGRAPHY
实验动物兔子心电图奇异性检测:进化谱方法被引量:1
2009年
基于小波变换的进化谱分析能够揭示非平稳信号特定时刻的时—频域特性.实验动物兔子左冠状动脉前降支结扎实验,可以模拟早期心肌缺血症状的不同生理变化过程.左冠状动脉病变引发心肌缺血是急性心肌梗死等冠心病的早期主要征兆.文中提出了基于连续复小波变换的进化谱估计算法,在满足时—频域不确定性原理条件下,为获得非平稳信号的瞬时频谱提供了一种有效的新方法,它能够识别生命系统数据中的局部奇异性.应用这种算法对实验动物兔子的多种心电图数据的进化谱分析结果表明,QRS波群进化谱特性的变化与早期心肌缺血有内在关联.QRS波群进化谱品质因数Q是心电图在时—频域的一个特征参数,Q数值变异可能为识别早期心肌缺血提供一种新的医学诊断参考特征.
刘新元何定武裴留庆
关键词:非平稳信号
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