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A new method for objective identification and measurement of airway lumen in paediatric flexible videobronchoscopy

Masters, Ian B., Eastburn, M., Wootton, R., Ware, Robert S., Francis, Paul V., Zimmerman, Paul V. and Chang, Anne B. (2005). A new method for objective identification and measurement of airway lumen in paediatric flexible videobronchoscopy. Thorax,60(8):652-658.

Document type: Journal Article
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IRMA ID 10491xPUB117
Title A new method for objective identification and measurement of airway lumen in paediatric flexible videobronchoscopy
Author Masters, Ian B.
Eastburn, M.
Wootton, R.
Ware, Robert S.
Francis, Paul V.
Zimmerman, Paul V.
Chang, Anne B.
Journal Name Thorax
Publication Date 2005
Volume Number 60
Issue Number 8
ISSN 0040-6376   (check CDU catalogue open catalogue search in new window)
Start Page 652
End Page 658
Total Pages 7
Place of Publication London, UK
Publisher BMJ Publishing Group
Field of Research 1103 - Clinical Sciences
HERDC Category C1 - Journal Article (DEST)
Abstract BACKGROUND: Accurate measurements of airway and lesion dimensions are important to the developmental progress of paediatric bronchoscopy. The malacia disorders are an important cause of respiratory morbidity in children, but no methods are currently available to measure these lesions or the airway lumen accurately. A new measurement technique is described here. METHODS: The magnification power of a paediatric videobronchoscope was defined and a simple and user friendly computer based program (Image J) was used to develop an objective technique (colour histogram mode technique, CHMT) for measurement of the airway lumen. RESULTS: In vivo intra-observer and inter-observer repeatability coefficients for repeated area measurements from 28 images using the Bland-Altman method were 0.9 mm2 and 1.6 mm2, respectively. The average intraclass correlation coefficient for repeated measurements of area was 0.93. In vitro validation measurements using a 2 mm diameter tube resolved radii measurements to within 0.1 mm (coefficient of variability 8%). An "acceptable result" was defined in 92% of 734 images completed with the CHMT alone and 8% with its modification. The success rate for two of three images being within 10% of each other's area was 100%. Measurements of cricoid cross sectional areas from 116 patients compared with expected airway areas for age derived from endotracheal tube sizes were comparable. CONCLUSIONS: The CHMT method of identifying and measuring airway dimensions is objective, accurate, and versatile and, as such, is important to the future development of flexible videobronchoscopy.
Keywords airway
lumen
measurement
paediatric
videobronchoscopy
DOI http://dx.doi.org/10.1136/thx.2004.034421   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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