基于小波变换分析阻抗胃动力信息

研究了基于小波变换提取胃运动信息的新方法,运用小波多分辨分析对采集的体表胃阻抗信号进行分解,去掉呼吸阻抗信号和血流阻抗信号,提取近似成份作为胃收缩信号.该方法能够提取胃运动的信号和同步胃电信号,可对提取信号的主频进行不同频带的分类,计算功率谱参数、描绘动态谱,从而研究胃动力情况.应用小波变换可以有效消除叠加到阻抗信号中的各种干扰,通过与同步胃电信号共同验证,该方法能完成阻抗信号提取,为临床胃动力信息研究提供一种体表无创伤新途径.

Analysis of bio-impedance gastric motility information based on wavelet transform

A new approach for extracting bio-impedance gastric motility information is studied. This approach uses wavelet multi-resolution analysis to decompose the signals from body surface, gets rid of breathing impedance signal and blood flowing impedance signal, and extracts approximate components as gastric contraction signal. The gastric motility information and the synchronous gastric slow waves can be observed by the approach, the signal can be classifted according to the dominant power and dominant frequency, and the gastric motility situation can be researched according to the signal extracted by wavelet transform. Wavelet transform can eliminate various interferences overlapped on impedance signal. Based on the synchronous electrogastrography and the impedance signal, this method can accomplish the extraction of impedance signal and provides a non-invasive method to investigate clinical gastric motility information.