Imperial College London
Alternate

DrSimonPadley

Faculty of Medicine, National Heart & Lung Institute

Professor of Practice (Diagnostic & Interventional Radiology
 
 
 
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Contact

 

+44 (0)20 7351 8381s.padley

 
 
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Location

 

CT ReportingSydney StreetRoyal Brompton Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Ng:1999:10.1080/00005382-199910000-00008,
author = {Ng, CS and Desai, SR and Rubens, MB and Padley, SPG and Hansell, DM and Wells, AU},
doi = {10.1080/00005382-199910000-00008},
pages = {279--285},
title = {Visual quantitation and observer variation of signs of small airways disease at inspiratory and expiratory CT},
url = {http://dx.doi.org/10.1080/00005382-199910000-00008},
year = {1999}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - Areas of decreased pulmonary attenuation representing small airways disease can be identified on computed tomography (CT). The objective was to quantify differences between inspiratory and expiratory CT for the detection of signs of small airways disease by four observers. Observer variation and the superiority of a fine versus a coarse grading system were also evaluated. Inspiratory and expiratory CT scans of 106 patients with conditions characterized by small airways disease and 19 healthy individuals were assessed by four observers. The extent of decreased attenuation was scored on a fine scale to the nearest 5% and also semiquantitatively on a coarser 5-point scale. Decreased attenuation was more extensive on expiratory CT (median, 6.7%; 0-76.7%) than on inspiratory CT (median, 3.8%; 0-81.7%). The fine scoring system had unacceptable interobserver variation (coefficient of variation, 80% for inspiratory CT, 70% for expiratory CT). The semiquantitative system had acceptable interobserver agreement (inspiratory CT kw = 0.64; expiratory CT, kw = 0.69) and good intra-observer agreement (inspiratory CT, kw = 0.80; expiratory CT, kw = 0.64). The major CT sign of small airways disease is more confidently quantified on expiratory CT. A fine scoring system is associated with unacceptable observer variation, and a coarse semiquantitative system is more suitable for quantitative studies of small airways disease. © 1999 Lippincott Williams and Wilkins, Inc.
AU  - Ng,CS
AU  - Desai,SR
AU  - Rubens,MB
AU  - Padley,SPG
AU  - Hansell,DM
AU  - Wells,AU
DO  - 10.1080/00005382-199910000-00008
EP  - 285
PY  - 1999///
SN  - 0883-5993
SP  - 279
TI  - Visual quantitation and observer variation of signs of small airways disease at inspiratory and expiratory CT
UR  - http://dx.doi.org/10.1080/00005382-199910000-00008
ER  -
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