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Validation and characterization of the computerized laryngeal analyzer (CLA) technique
Linköping University, Department of Neuroscience and Locomotion, Oto-Rhiono-Laryngology and Head & Neck Surgery. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Neuroscience and Locomotion, Oto-Rhiono-Laryngology and Head & Neck Surgery. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
1999 (English)In: Dysphagia (New York. Print), ISSN 0179-051X, E-ISSN 1432-0460, Vol. 14, no 4, 191-195 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the response characteristics of the Computerized Laryngeal Analyzer (CLA) and the validity of the noninvasive CLA method to detect swallowing-induced laryngeal elevation correctly. Two healthy adults and two experimental models were used in the study. The CLA technique identified all swallowing events but was unable to discriminate between swallowing and other movements of the tongue or the neck. The computer program produced a derivated response to a square wave signal. Stepwise bending increments of the sensor displayed a linear amplitude response. The degree of laryngeal elevation could not be estimated with the CLA technique, and it was not possible to draw any reliable conclusions from the recordings as to whether the larynx was moving upward or downward.

Place, publisher, year, edition, pages
1999. Vol. 14, no 4, 191-195 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-32932DOI: 10.1007/PL00009605Local ID: 18883OAI: oai:DiVA.org:liu-32932DiVA: diva2:253755
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-01-02
In thesis
1. Bioacoustic principles used in monitoring and diagnostic applications
Open this publication in new window or tab >>Bioacoustic principles used in monitoring and diagnostic applications
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The idea behind this work is linked to the experience gained from the long use of the stethoscope, and to the fact that sound originating from the body is a mechanical fingerprint, reflecting the human body functions.

The aims of this thesis have been to develop bioacoustic systems using modern medical signal processing in three applications. The first was to develop a method for monitor the respiration, the second was to develop a detection method for the third heart sound and, the third was to study a swallowing detection technique and look into the potential of bioacoustic development in this area.

Respiratory monitoring is of vital importance in several clinical situations. A bioacoustic signal analysis approach has been developed for monitoring of respiration. This approach includes strategies to differentiate between inspiration and expiration. In two different patient groups, the method has managed to detect 98% of the respiratory cycles.

The third heart sound has been found to be related to heart failure. A tailored wavelet technique has been developed fur detection of the third heart sound. The method has been used in children and in patients with heart failure. The wavelet metod detected 87% of the third heart sounds and only 2% were classified as false positive.

An investigation of an existing method for swallowing detection, computerized laryngeal analyser (CLA), was performed toghether with a pilot study involving swallowing sounds for the detection. The CLA technique was found to be inadequate for swallowing detection. The bioacoustic approach showed promise for detection of swallows.

We expect in the future that bioacoustics will be an important medical field, for diagnosis, monitoring, rehabilitation and education. The methods show potential for increased use, both in hospital and primary care.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2002. 72 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 778
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-24564 (URN)6729 (Local ID)91-7373-438-1 (ISBN)6729 (Archive number)6729 (OAI)
Public defence
2002-11-08, Aulan, Administrationshuset, Universitetssjukhuset, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-01-02

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Danbolt, ChristinaHult, PeterAsk, Per

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Danbolt, ChristinaHult, PeterAsk, Per
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Oto-Rhiono-Laryngology and Head & Neck SurgeryFaculty of Health SciencesDepartment of Biomedical EngineeringThe Institute of Technology
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Dysphagia (New York. Print)
Medical and Health Sciences

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