Medical parameters extraction of heart sounds

doi:10.3778/j.issn.1002-8331.2011.03.063

Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (3): 214-217.DOI: 10.3778/j.issn.1002-8331.2011.03.063

• 工程与应用 • Previous Articles Next Articles

Medical parameters extraction of heart sounds

GUO Xingming¹，LIN Huijie1，XIAO Shouzhong^1，2

1.Chongqing Engineering Research Center for MET，College of Bioengineering，Chongqing University，Chongqing 400030，China
2.Bojing Medical Information Institute，Chongqing 400030，China

Received:2009-07-14 Revised:2009-11-09 Online:2011-01-21 Published:2011-01-21
Contact: GUO Xingming

心音中医学指标的提取

郭兴明¹，林辉杰¹，肖守中^1，2

1.重庆大学生物工程学院重庆市医疗电子技术工程研究中心，重庆 400030
2.重庆博精医学信息研究所，重庆 400030

通讯作者: 郭兴明

Abstract

Abstract: A method for medical parameters extraction from heart sounds is proposed based on the intrinsic property of heart sounds and empirical mode decomposition.The original signal is pre-processed，then Huang transform is applied to the pre-processed signal.Kinds of order of Intrinsic Mode Functions（IMFs） are acquired from Huang transform.The envelop of heart sounds is extracted from the Hilbert transform of first and second order of the IMFs.The location of the first and second heart sound is identified by explicit double threshold.In addition，heart rate，the amplitude ratio of the first and second heart sound（S1/S2） and the duration ratio of the diastolic and systolic（D/S） are detected which benefit the evaluation of cardiac reserve in clinics.

Key words: empirical mode decomposition, double threshold, heart rate, S1/S2, D/S

摘要： 根据心音信号自身的特点，结合经验模式分解，提出了一种从心音信号中提取医学指标的方法。对心音信号进行预处理，然后对预处理后的信号采用黄变换，获取各阶固有模态函数（IMFs），从中选取第一和第二阶IMF进行希尔伯特变换，得到心音的包络。利用双阈值法，并给出具体的阈值，实现了对第一心音（S1）和第二心音（S2）的定位，从心音信号中获取了心率S1和S2的幅值比（S1/S2）以及舒张期和收缩期的时限比（D/S），为临床上评估心脏储备提供了便利。

关键词: 经验模式分解, 双阈值法, 心率, S1和S2的幅值比, 舒张期和收缩期的时限比

CLC Number:

R318

GUO Xingming¹，LIN Huijie1，XIAO Shouzhong^1，2. Medical parameters extraction of heart sounds[J]. Computer Engineering and Applications, 2011, 47(3): 214-217.

郭兴明¹，林辉杰¹，肖守中^1，2. 心音中医学指标的提取[J]. 计算机工程与应用, 2011, 47(3): 214-217.

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Medical parameters extraction of heart sounds

心音中医学指标的提取

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