心电相空间映射定量分析的一种新方法--棋盘映射  

A Novel Quantitative Analysis Method Called Tessellated Map for ECG Mapped Phase Space

作　　者：李延军[1] 严洪[1] 王增丽 杨向林[1] 

机构地区：[1]中国航天员科研训练中心,航天医学基础与应用国家重点实验室,北京100094 [2]北京恒光信息技术有限公司,北京100089

出　　处：《航天医学与医学工程》2010年第1期57-62,共6页Space Medicine & Medical Engineering

基　　金：中国航天员中心预研项目(SJ200903)

摘　　要：目的鉴于传统的标量坐标延时相空间重构方法存在运算复杂、耗时大、稳定性差等缺点,本文提出了相空间定量分析的一种新方法——"棋盘"映射(tessellated map,TM)。方法首先以逐拍心电波形为列矢量构造二维矩阵X,再通过KL变换得到X的主分量,然后由X的最大特征向量重构X。基于重构误差,从X中筛选出高SNR的正常心拍,得到二维矩阵Y。由模值归一化的Y及其衍生差分阵Z,得到"棋盘格"映射图。通过空白区域的比例、点密度、棋盘映射"位图"3个指标对TM进行定量评估。结果实验结果表明,TM能够对精神应激和非应激进行区分,能够判断心律失常,能够用于身份识别。结论TM能够有效地从ECG中提取信息,值得深入研究。Objective The traditional delay time phase space reconstruction method has the disadvantages of complicated operation,time consuming and unstableness.This paper presented a novel approach called Tessellated Map（TM） for ECG phase space quantitative analysis.Methods Firstly,2-D matrix X with each ECG-cycle as a column vector was constructed.Secondly,the principal components of X based on Karhunen-Loeve Transform（KLT） were gotten to reconstruct X from the first eigenvector of XXT.Then the high SNR ECG-cycle form X based on reconstruction error was selected,to construct the 2-D matrix Y.Afterwards,TM was gotten from united Y and Z（derived from the difference of Y）.Three TM-based quantitative indexes,consisted of ratio of blank zone,density of points and TM Bitmap（TMB） were gotten.Results This approach could differentiate mental stress from non-stress,estimate arrhythmia,and could be used for personal identification.Conclusion TM is a useful way to obtain information from ECG,and has its value for further research.

关 键 词：心电图 相空间重构 KL变换 棋盘映射 

分 类 号：R318[医药卫生—生物医学工程]