Applying cybernetic technology to diagnose human pulmonary sounds

Mei Yung Chen, Cheng Han Chou

Research output: Contribution to journalArticle

Abstract

Chest auscultation is a crucial and efficient method for diagnosing lung disease; however, it is a subjective process that relies on physician experience and the ability to differentiate between various sound patterns. Because the physiological signals composed of heart sounds and pulmonary sounds (PSs) are greater than 120 Hz and the human ear is not sensitive to low frequencies, successfully making diagnostic classifications is difficult. To solve this problem, we constructed various PS recognition systems for classifying six PS classes: vesicular breath sounds, bronchial breath sounds, tracheal breath sounds, crackles, wheezes, and stridor sounds. First, we used a piezoelectric microphone and data acquisition card to acquire PS signals and perform signal preprocessing. A wavelet transform was used for feature extraction, and the PS signals were decomposed into frequency subbands. Using a statistical method, we extracted 17 features that were used as the input vectors of a neural network. We proposed a 2-stage classifier combined with a back-propagation (BP) neural network and learning vector quantization (LVQ) neural network, which improves classification accuracy by using a haploid neural network. The receiver operating characteristic (ROC) curve verifies the high performance level of the neural network. To expand traditional auscultation methods, we constructed various PS diagnostic systems that can correctly classify the six common PSs. The proposed device overcomes the lack of human sensitivity to low-frequency sounds and various PS waves, characteristic values, and a spectral analysis charts are provided to elucidate the design of the human-machine interface.

Original languageEnglish
Number of pages1
JournalJournal of Medical Systems
Volume38
Issue number6
DOIs
Publication statusPublished - 2014 Jun 1

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Cybernetics
Respiratory Sounds
Acoustic waves
Technology
Auscultation
Neural networks
Heart Sounds
Wavelet Analysis
Aptitude
Haploidy
ROC Curve
Lung Diseases
Ear
Pulmonary diseases
Thorax
Vector quantization
Learning

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Information Systems
  • Health Informatics
  • Health Information Management

Cite this

Applying cybernetic technology to diagnose human pulmonary sounds. / Chen, Mei Yung; Chou, Cheng Han.

In: Journal of Medical Systems, Vol. 38, No. 6, 01.06.2014.

Research output: Contribution to journalArticle

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