Phase coupling analysis of gastric pressure activity via wavelet packet based diagonal slice spectra

被引:14
作者
Yan, Ronqquo [1 ]
Yan, Guozheng
Zhang, Wenqiang
Zhang, Genfu
机构
[1] Shanghai Jiao Tong Univ, Dept Informat Measurement Technol & Instruments, Shanghai 200030, Peoples R China
[2] Peoples Hosp Pudong New District Shanghai, Shanghai 201200, Peoples R China
关键词
gastric pressure activity; quadratic phase coupling (QPC); diagonal slice spectrum; wavelet packet transform;
D O I
10.1016/j.cmpb.2006.07.004
中图分类号
TP39 [计算机的应用];
学科分类号
081203 [计算机应用技术]; 0835 [软件工程];
摘要
We propose a new analysis method to detect quadratic phase coupling (QPC) behavior of human gastric interdigestive pressure activity that has been acquired by a telemetric capsule-like mini-robot. The method is referred to as diagonal slice spectra. They are the Fourier transforms of the diagonal slices of the triple correlations, and can actually detect the phase coupling and coupled components respectively by expanding the real process into the complex counterpart through Hilbert transform. In order to learn more about the QPC structure in a certain frequency band that we are mostly interested in and obtain a higher frequency resolution, the method, named the wavelet packet based diagonal slice spectrum, is introduced. It shows that the nonlinear QPC behavior occurs during gastric contractions (phase II), whereas no distinct phase coupling occurs during gastric motor quiescence (phase 1). It is the nonlinear cell-to-cell coupling mechanisms, existence of fast and slow waves and their interactions that nonlinear QPC structure of the gastric pressure activity occurs. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:198 / 204
页数:7
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