Document Detail


Development of a cardiac acoustic mapping system.
MedLine Citation:
PMID:  10198525     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The authors describe a cardiac acoustic mapping system designed to acquire, analyse, and display the amplitude distribution of a phonocardiogram (PCG) recorded from 22 sites on the thorax. A new PCG envelope detection approach, implemented by analogue circuits, enables simultaneous sampling of PCG envelopes from the 22 sites at a rate of 250 Hz/channel. A calibration procedure removes channel-to-channel gain variations, and a coherent averaging of each PCG envelope over several cardiac cycles improves the signal-to-noise ratio. Time congruent samples from the 22 averaged PCG envelopes are then interpolated in 2D to generate the isoamplitude maps. Preliminary results show that the acoustic maps can help locate the source of heart sounds and murmurs, and characterise their radiation and propagation patterns. Cardiac acoustic mapping opens up new avenues for the study of the propagation of heart sounds and murmurs through the heart-thorax acoustic system. This technique could contribute to improvements in the diagnosis of valvular dysfunctions.
Authors:
M Cozic; L G Durand; R Guardo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  36     ISSN:  0140-0118     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1999-04-19     Completed Date:  1999-04-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  431-7     Citation Subset:  IM    
Affiliation:
Laboratoire de génie biomédical, IRCM, Université de Montréal, Québec, Canada.
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MeSH Terms
Descriptor/Qualifier:
Calibration
Heart Murmurs / diagnosis*
Humans
Phonocardiography / methods*
Signal Processing, Computer-Assisted*

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


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