基于最小一乘估计的心电图ST段长度提取策略  

Extracting Strategy for Interval of ST Segment in ECG Based on Least Absolute Deviation Estimation

作　　者：王大雄[1] 徐耕[2] 

机构地区：[1]湖州师范学院信息与工程学院,浙江湖州313000 [2]浙江大学医学院附属二院,浙江杭州310006

出　　处：《航天医学与医学工程》2011年第5期357-360,共4页Space Medicine & Medical Engineering

基　　金：国家自然科学基金资助项目(60872057);浙江省自然科学基金项目(R1090244;Y1101237;Y1110944);浙江省教育厅科研项目(20070478)

摘　　要：目的提出1种基于最小一乘估计(LADE)提取ST段长度的新策略。方法检测出QRS波群并确定1点在QRS波群内,以所确定的点为基点,向后逐段求出线段参数的LADE并求出线段的偏离度,根据线段参数的LADE和偏离度确定基线,在此基线上再应用假设检验的方法得出QRS波群的终末点,再将QRS波群后的T波根据LADE分成4类,在不同的类中用不同的条件确定Q点和Q回归直线,根据心电数据和Q回归直线在Q点后的偏离程度确定T波起始点,从而提取了ST段长度。结果应用具有广泛认可度的MIT-BIH数据库的QT数据库的所有具有T波起始点标记的数据文件验证算法,在专家标记的1412个ST段长度上获得了2.4 ms的平均误差。结论基于LADE提取ST段长度的策略是可行的。Objective To propose a new strategy basing on least absolute deviation estimation（LADE） for extracting the interval of ST segment in ECG.Methods Based on the detected position inside QRS complexes,the LADE and deviation of linear segments from this point was calculated backward and a basic linear segment was checked out.Upon this,the offset of QRS complex was determined by hypothesis testing.The T wave afterwards was classified into 4 groups under LADE.Q point and Q regression line were decided according to different criterion under different groups.After Q point,the deviation between ECG data and Q regression line determined the onset of T wave.Thus the interval of ST segment was extracted.Results The strategy was verified by all the records from QT database,in which the T wave onset was marked by cardiologists,and reached the average error of 2.4 ms on 1412 ST segment marked by cardiologists.Conclusion The strategy of LADE-based interval extraction for ST segment is feasible.

关 键 词：心电图 最小一乘估计 ST段长度 多导联分析 

分 类 号：R319[医药卫生—基础医学] R540.4