Comparison of short-time Fourier, wavelet and time-domain analyses of intracardiac sounds

J. R. Bulgrin, B. J. Rubal, C. R. Thompson, J. M. Moody

Research output: Chapter in Book/Report/Conference proceedingConference contribution

37 Scopus citations

Abstract

Heart sounds provide clinicians with valuable diagnostic and prognostic information. They are repetitive in nature, but reflect complex mechano-acoustical events which have been inadequately described by traditional digital signal processing methods. In this study, left ventricular and aortic intravascular phonocardiograms were obtained from six patients by catheter-mounted piezoelectric transducers. Phonocardiograms (PCGs) were bandpass filtered (50-500 Hz), digitized at 4kHz and analyzed by three separate techniques: (1) Short-Time Fourier Transform (STFT), (2) Fast Wavelet Transform (FWT), and (3) a pulse-counting time domain method based on an Order Statistic (OS) filter. The resulting time frequency distributions were employed to examine intra-patient and inter-patient acoustic variability. Results suggest that STFT and FWT provide comparable temporal and frequency resolution of cardiac acoustical events. However, the time-varying and multicomponent nature of heart sounds was poorly characterized by the OS technique employed in this study. This study suggests that improved localization of acoustic events during the cardiac cycle may prove useful in the development of automated auscultation devices.

Original languageEnglish (US)
Title of host publicationBiomedical Sciences Instrumentation
PublisherPubl by ISA Services Inc
Pages465-472
Number of pages8
Volume29
ISBN (Print)1556174578
StatePublished - Jan 1 1993
EventProceedings of the 30th Annual Rocky Mountain Bioengineering Symposium and the 30th International ISA Biomedical Sciences Instrumentation Symposium - San Antonio, TX, USA
Duration: Apr 2 1993Apr 3 1993

Other

OtherProceedings of the 30th Annual Rocky Mountain Bioengineering Symposium and the 30th International ISA Biomedical Sciences Instrumentation Symposium
CitySan Antonio, TX, USA
Period4/2/934/3/93

ASJC Scopus subject areas

  • Biophysics
  • Medical Laboratory Technology

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    Bulgrin, J. R., Rubal, B. J., Thompson, C. R., & Moody, J. M. (1993). Comparison of short-time Fourier, wavelet and time-domain analyses of intracardiac sounds. In Biomedical Sciences Instrumentation (Vol. 29, pp. 465-472). Publ by ISA Services Inc.