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Detection of the 3rd Heart Sound using Recurrence Time Statistics
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
2006 (English)In: Proc. 31st IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse, France, 2006, 2006, 1040-1043 p.Conference paper, Published paper (Other academic)
Abstract [en]

The 3rd heart sound (S3) is normally heard during auscultation of younger individuals, but it is also common in many patients with heart failure. Compared to the 1st and 2nd heart sounds, S3 has low amplitude and low frequency content, making it hard to detect (both manually for the physician and automatically by a detection algorithm). We present an algorithm based on a recurrence time statistic which is sensitive to changes in a reconstructed state space, particularly for detection of transitions with very low energy. Heart sound signals from ten children were used in this study. Most S3 occurrences were detected (98 %), but the amount of false extra detections was rather high (7% of the heart cycles). In conclusion, the method seems capable of detecting S3 with high accuracy and robustness.

Place, publisher, year, edition, pages
2006. 1040-1043 p.
Series
IEEE International Conference on Acoustics, Speech and Signal Processing. Proceedings, ISSN 1520-6149
Keyword [en]
acoustic, signal detection, bioacoustics, signal reconstruction, statistics, heart sound, auscultation, heart failure, reconstructed state space, recurrence time statistics
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-14058OAI: oai:DiVA.org:liu-14058DiVA: diva2:22546
Available from: 2006-10-09 Created: 2006-10-09 Last updated: 2009-04-21
In thesis
1. Processing of the Phonocardiographic Signal: methods for the intelligent stethoscope
Open this publication in new window or tab >>Processing of the Phonocardiographic Signal: methods for the intelligent stethoscope
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Phonocardiographic signals contain bioacoustic information reflecting the operation of the heart. Normally there are two heart sounds, and additional sounds indicate disease. If a third heart sound is present it could be a sign of heart failure whereas a murmur indicates defective valves or an orifice in the septal wall. The primary aim of this thesis is to use signal processing tools to improve the diagnostic value of this information. More specifically, three different methods have been developed:

• A nonlinear change detection method has been applied to automatically detect heart sounds. The first and the second heart sounds can be found using recurrence times of the first kind while the third heart sound can be found using recurrence times of the second kind. Most third heart sound occurrences were detected (98 %), but the amount of false extra detections was rather high (7 % of the heart cycles).

• Heart sounds obscure the interpretation of lung sounds. A new method based on nonlinear prediction has been developed to remove this undesired disturbance. High similarity was obtained when comparing actual lung sounds with lung sounds after removal of heart sounds.

• Analysis methods such as Shannon energy, wavelets and recurrence quantification analysis were used to extract information from the phonocardiographic signal. The most prominent features, determined by a feature selection method, were used to create a new feature set for heart murmur classification. The classification result was 86 % when separating patients with aortic stenosis, mitral insufficiency and physiological murmurs.

The derived methods give reasonable results, and they all provide a step forward in the quest for an intelligent stethoscope, a universal phonocardiography tool able to enhance auscultation by improving sound quality, emphasizing abnormal events in the heart cycle and distinguishing different heart murmurs.

Place, publisher, year, edition, pages
Institutionen för medicinsk teknik, 2006. 75 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1253
Keyword
Bioacoustics, phonocardiographic, signal processing, heart sound, lung sound, nonlinear dynamics
National Category
Biomedical Laboratory Science/Technology
Identifiers
urn:nbn:se:liu:diva-7538 (URN)LiU-TEK-LIC-2006:34 (Local ID)91-85523-59-3 (ISBN)LiU-TEK-LIC-2006:34 (Archive number)LiU-TEK-LIC-2006:34 (OAI)
Presentation
2006-05-31, IMT1, Campus US, Linköpings universitet, Linköping, 00:00 (English)
Opponent
Supervisors
Available from: 2006-10-09 Created: 2006-10-09 Last updated: 2010-01-14Bibliographically approved

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Ahlström, ChristerHult, PeterAsk, Per

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