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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
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.
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.
- 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.