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A physical approach to the automated classification of clinical percussion sounds a
a
Portions of this work were presented at the ONR conferences between 2008 and 2010, Arlington, VA, 28–29 July 2008.
J. Acoust. Soc. Am. Volume 131, Issue 1, pp. 608-619 (2012); (12 pages)
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Add to FacebookChest percussion is a traditional technique used for the physical examination of pulmonary injuries and diseases. It is a method of tapping body parts with fingers or small instruments to evaluate the size, consistency, borders, and presence of fluid/air in the lungs and abdomen. Percussion has been successfully used for the diagnosis of such potentially lethal conditions as traumatic and tension pneumothorax. This technique, however, has certain shortcomings, including limitations of the human ear and the subjectivity of the administrator, that lead to overall low sensitivity. Automation of the method by using a standardized percussion source and computerized classification of digitized signals would remove the subjective factor and other limitations of the technique. It would also enable rapid on-site diagnostics of pulmonary traumas when thorough clinical examination is impossible. This paper lays the groundwork for an objective signal classification approach based on a general physical model of a damped harmonic oscillator. Using this concept, critical parameters that effectively subdivide percussion signals into three main groups, historically known as “tympanic,” “resonant,” and “dull,” are identified, opening the possibility for automated diagnostics of air/liquid inclusions in the thorax and abdomen. The key role of damping in forming the character of the percussion signal is investigated using a 3D thorax phantom. The contribution of the abdominal component into the complex multimode spectrum of chest percussion signals is demonstrated.
© 2012 Acoustical Society of America
ACKNOWLEDGMENT
This work is supported by the U.S. Office of Naval Research SBIR Grant No. N00014-07-C-0366.
Article Outline
- INTRODUCTION
- Acoustic methods for medical diagnostic
- Auscultation
- Percussion
- Auscultatory percussion.
- “Classical percussion.”
- Acoustic methods for medical diagnostic
- THEORETICAL AND PHYSICAL MODELS FOR THE PERCUSSION RESPONSE OF THE BODY
- Clinical percussion and types of percussion signals
- Physical origin of percussion signals
- Abdominal percussion
- Chest percussion
- Laboratory chest phantom
- EXPERIMENTAL SETUP FOR COLLECTION OF PERCUSSION SIGNALS FROM VOLUNTEERS
- SIMPLIFIED MODEL FOR THE PERCUSSION RESPONSE OF THE HUMAN CHEST AND ABDOMEN
- Overview and time domain analysis
- Exploring the damping of the modes by spectral analysis
- STATISTICAL ANALYSIS
- INPUT SIGNAL DECONVOLUTION
- CONCLUSIONS
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History
Received 27 Oct 2010
Accepted 07 Nov 2011
Revised 30 Oct 2011
Accepted 07 Nov 2011
Revised 30 Oct 2011
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