Document Detail


Comparison of short-time Fourier, wavelet and time-domain analyses of intracardiac sounds.
MedLine Citation:
PMID:  8329628     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
J R Bulgrin; B J Rubal; C R Thompson; J M Moody
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Biomedical sciences instrumentation     Volume:  29     ISSN:  0067-8856     ISO Abbreviation:  Biomed Sci Instrum     Publication Date:  1993  
Date Detail:
Created Date:  1993-08-17     Completed Date:  1993-08-17     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0140524     Medline TA:  Biomed Sci Instrum     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  465-72     Citation Subset:  IM    
Affiliation:
Brooke Army Medical Center, San Antonio, TX.
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MeSH Terms
Descriptor/Qualifier:
Adult
Algorithms
Fourier Analysis*
Heart Sounds*
Humans
Male
Middle Aged
Phonocardiography*
Reference Values
Signal Processing, Computer-Assisted*
Transducers

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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