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Related Experiment Videos

Development of a cardiac acoustic mapping system.

M Cozic1, L G Durand, R Guardo

  • 1Laboratoire de génie biomédical, IRCM, Université de Montréal, Québec, Canada.

Medical & Biological Engineering & Computing
|April 13, 1999
PubMed
Summary

This study introduces a cardiac acoustic mapping system to visualize heart sound propagation. The system aids in locating heart sound sources and characterizing murmurs, potentially improving valvular dysfunction diagnosis.

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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Imaging

Background:

  • Phonocardiograms (PCG) provide valuable diagnostic information.
  • Traditional PCG analysis has limitations in spatial localization of heart sounds.
  • Understanding sound propagation is crucial for diagnosing cardiac conditions.

Purpose of the Study:

  • To develop and validate a cardiac acoustic mapping system.
  • To visualize the amplitude distribution of PCG signals across the thorax.
  • To assess the system's utility in localizing and characterizing heart sounds and murmurs.

Main Methods:

  • Acquisition of PCG signals from 22 thoracic sites.
  • Novel analogue circuit-based PCG envelope detection for simultaneous sampling.

Related Experiment Videos

  • Calibration for gain variations and coherent averaging to enhance signal-to-noise ratio.
  • 2D interpolation of averaged PCG envelopes to generate isoamplitude maps.

    • Main Results:

    • The system successfully generated 2D isoamplitude maps of cardiac acoustic signals.
    • Preliminary results demonstrate the ability to locate the source of heart sounds.
    • Characterization of radiation and propagation patterns of heart sounds and murmurs was achieved.

    Conclusions:

    • Cardiac acoustic mapping offers new insights into heart sound and murmur propagation.
    • The technique shows promise for improving the diagnosis of valvular dysfunctions.
    • This technology advances the study of the heart-thorax acoustic system.