Comput Methods Programs Biomed - Assessment of time-frequency representation techniques for thoracic sounds analysis.


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A step forward in the knowledge about the underlying physiological phenomena of thoracic sounds requires a reliable estimate of their time-frequency behavior that overcomes the disadvantages of the conventional spectrogram. A more detailed time-frequency representation could lead to a better feature extraction for diseases classification and stratification purposes, among others. In this respect, the aim of this study was to look for an omnibus technique to obtain the time-frequency representation (TFR) of thoracic sounds by comparing generic goodness-of-fit criteria in different simulated thoracic sounds scenarios. The performance of ten TFRs for heart, normal tracheal and adventitious lung sounds was assessed using time-frequency patterns obtained by mathematical functions of the thoracic sounds. To find the best TFR performance measures, such as the 2D local ((mean)) and global () central correlation, the normalized root-mean-square error (NRMSE), the cross-correlation coefficient ((IF)) and the time-frequency resolution (res(TF)) were used. Simulation results pointed out that the Hilbert-Huang spectrum (HHS) had a superior performance as compared with other techniques and then, it can be considered as a reliable TFR for thoracic sounds. Furthermore, the goodness of HHS was assessed using noisy simulated signals. Additionally, HHS was applied to first and second heart sounds taken from a young healthy male subject, to tracheal sound from a middle-age healthy male subject, and to abnormal lung sounds acquired from a male patient with diffuse interstitial pneumonia. It is expected that the results of this research could be used to obtain a better signature of thoracic sounds for pattern recognition purpose, among other tasks.

Resumo Limpo

step forward knowledg under physiolog phenomena thorac sound requir reliabl estim timefrequ behavior overcom disadvantag convent spectrogram detail timefrequ represent lead better featur extract diseas classif stratif purpos among other respect aim studi look omnibus techniqu obtain timefrequ represent tfr thorac sound compar generic goodnessoffit criteria differ simul thorac sound scenario perform ten tfrs heart normal tracheal adventiti lung sound assess use timefrequ pattern obtain mathemat function thorac sound find best tfr perform measur d local mean global central correl normal rootmeansquar error nrmse crosscorrel coeffici timefrequ resolut restf use simul result point hilberthuang spectrum hhs superior perform compar techniqu can consid reliabl tfr thorac sound furthermor good hhs assess use noisi simul signal addit hhs appli first second heart sound taken young healthi male subject tracheal sound middleag healthi male subject abnorm lung sound acquir male patient diffus interstiti pneumonia expect result research use obtain better signatur thorac sound pattern recognit purpos among task

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