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Indexed by:期刊论文

Date of Publication:2005-10-01

Journal:IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:52

Issue:10

Page Number:1692-1701

ISSN No.:0018-9294

Key Words:empirical mode decomposition; esophageal motility; gastroesophageal reflux disease; lower esophageal sphincter

Abstract:The Empirical Mode Decomposition (EMD) is a general signal processing method for analyzing nonlinear and nonstationary time series. The central idea of EMD is to decompose a time series into a finite and often small number of intrinsic mode functions (IMFs). An IMF is defined as any function having the number of extrema and the number of zero-crossings equal (or differing at most by one), and also having symmetric envelopes defined by the local minima, and maxima respectively. The decomposition procedure is adaptive, data-driven, therefore, highly efficient. In this contribution, we applied the idea of EMD to develop strategies to automatically identify the relevant IMFs that contribute to the slow-varying trend in the data, and presented its application on the analysis of esophageal manometric time series in gastroesophageal reflux disease. The results from both extensive simulations and real data show that the EMD may prove to be a vital technique for the analysis of esophageal manometric data.