小波变换去噪方法在多谱勒胎儿心率提取中的应用研究  

The Doppler Fetal Heart Rate Detection with Wavelet Transform

作　　者：张榆锋[1] 曹毅[1] 章克信[2] 余炜[1] 施心陵[1] 

机构地区：[1]云南大学信息学院电子工程系,昆明650091 [2]昆明医学院第二附属医院,昆明650091

出　　处：《生物医学工程学杂志》2005年第2期339-342,共4页Journal of Biomedical Engineering

基　　金：云南省自然科学基金资助项目 (2 0 0 2 C0 0 0 2 Z);云南省科技计划资助项目 (2 0 0 2 PY10 )

摘　　要：为了从超声多谱勒胎音信号中提取胎音信号,获得平滑的胎心率曲线,并计算胎心率,必须去除信号提取过程中的各种干扰和噪声。对平均频移算法获得的多谱勒信号的平均频率曲线采用小波变换中的五层强制去噪方法,使后续的相关计算能得到平滑的胎音信号,从而方便计算胎儿的心率。通过对实际超声多谱勒胎音信号的处理,获得了较好的结果,提取出了稳定、平滑的胎心率曲线,较准确地计算出了胎心率。Various interference and noises should be eliminated while picking up the signal of fetal heart rate from the Doppler fetal signal in order to obtain smooth curve of the fetal heart Doppler signal and so to figure out the fetal heart rate. In this study,the mean frequency shift curve estimated from the Doppler fetal signals was smoothed using wavelet transform. The results showed that the fetal-heart rate obtained by computing from the autocorrelation waveform based on the smoothed mean frequency shift curve was more accurate than that based on unsmoothed curve.

关 键 词：多谱勒 胎心率 小波变换 小波消噪 超声多谱勒 胎儿心率 提取过程 去噪 平均频率 信号 

分 类 号：R318.0[医药卫生—生物医学工程]