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RenyiBS: Renyi entropy basis selection from wavelet packet decomposition tree for phonocardiogram classification

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Abstract

Wavelet packet transform (WPT) is a powerful mathematical tool for analyzing nonlinear biomedical signals, such as phonocardiogram (PCG). WPT decomposes a PCG signal into a full binary tree of details and approximation coefficients. Appropriate nodes of the tree could be selected as a basis for generating features. Motivated by this, we propose the Renyi entropy basis selection (RenyiBS) method. In RenyiBS method, we use the Renyi entropy as an information measure to choose the best basis of the wavelet packet tree of PCG signals for feature selection and classification. The Renyi entropy estimates the spectral complexity of a signal, which is vital for characterizing nonlinear signals such as PCGs. After selecting the best basis, we define features on the coefficients of the selected nodes. Then, we classify PCGs using the support vector machine (SVM) classifier. In the simulation, we examine a set of 820 heart sound cycles, including normal heart sounds and three types of heart murmurs. The three murmurs examined include aortic regurgitation, mitral regurgitation, and aortic stenosis. We achieved the promising result of 99.74% accuracy, confirming the ability of Renyi entropy to select an appropriate basis of the wavelet packet tree and extracting the nonlinear behavior of particular heart sounds. Besides, the superiority of our proposed information measure in comparison with other information measures reported before is shown.

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Acknowledgements

The authors gratefully acknowledge the financial and other supports of this research, provided by the Islamic Azad University, Islamshahr Branch, Tehran, Iran.

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Authors and Affiliations

  1. Department of Computer Engineering, Islamic Azad University, Islamshahr Branch, Tehran, Iran

    Fatemeh Safara

  2. Cardiology Department, Serdang Hospital, Serdang, Jalan Puchong, 43000, Kajang, Selangor Darul Ehsan, Malaysia

    Asri Ranga Abdullah Ramaiah

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  1. Fatemeh Safara
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  2. Asri Ranga Abdullah Ramaiah
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Correspondence to Fatemeh Safara.

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Safara, F., Ramaiah, A.R.A. RenyiBS: Renyi entropy basis selection from wavelet packet decomposition tree for phonocardiogram classification. J Supercomput 77, 3710–3726 (2021). https://doi.org/10.1007/s11227-020-03413-9

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  • DOI: https://doi.org/10.1007/s11227-020-03413-9

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