APPLICATION OF THE MATCHING PURSUIT METHOD FOR STRUCTURAL DECOMPOSITION AND AVERAGING OF PHONOCARDIOGRAPHIC SIGNALS

Citation
H. Sava et al., APPLICATION OF THE MATCHING PURSUIT METHOD FOR STRUCTURAL DECOMPOSITION AND AVERAGING OF PHONOCARDIOGRAPHIC SIGNALS, Medical & biological engineering & computing, 36(3), 1998, pp. 302-308
Citations number
21
Categorie Soggetti
Engineering, Biomedical","Computer Science Interdisciplinary Applications","Medical Informatics
ISSN journal
01400118
Volume
36
Issue
3
Year of publication
1998
Pages
302 - 308
Database
ISI
SICI code
0140-0118(1998)36:3<302:AOTMPM>2.0.ZU;2-R
Abstract
The paper evaluates the performance of an automatic adaptive time-freq uency method to detect each cardiac cycle of a phonocardiogram (PCG) a nd extract average heart sounds and PCG cycles. The proposed method co mbines a global search of the PCG, in terms of the energy distribution of the most important components, with a local search relating to the specific events found within a cardiac cycle. The method is applied t o 100 PCG recordings from 50 patients with an aortic bioprosthetic val ve. The performance of the proposed method is compared with a commonly used semi-automatic method that is based on the combined analysis of an electrocardiogram (ECG) and the PCG signal. Results show that the p roposed method clearly outperforms the semiautomatic method, especiall y in the case of patients with malfunctioning bioprostheses. By elimin ating the need to record an ECG as the time-reference signal, this met hod reduces hardware overheads when analysis of PCG signals is the pri mary aim. It is also independent of subjective human judgment for sele ction of reference templates and threshold levels. Furthermore, the me thod is robust to artefacts, background noise and other kinds of signa l interferences. With minor modifications, the procedure described cou ld be applied to other types of biomedical signal in order to extract coherent transient components and identify specific events.