Published ahead of print on October 29, 2004, doi:10.1164/rccm.200407-874OC
American Journal of Respiratory and Critical Care Medicine Vol 171. pp. 142-146, (2005)
© 2005 American Thoracic Society
doi: 10.1164/rccm.200407-874OC
The Prediction of Small Airway Dimensions Using Computed Tomography
Yasutaka Nakano,
Jonathan C. Wong,
Pim A. de Jong,
Lilliana Buzatu,
Taishi Nagao,
Harvey O. Coxson,
W. Mark Elliott,
James C. Hogg and
Peter D. Paré
Department of Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan; James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, St. Paul's Hospital; and Department of Radiology, Vancouver General Hospital, University of British Columbia, Vancouver, British Columbia, Canada
Correspondence and requests for reprints should be addressed to Peter D. Paré, M.D., James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Room 166, Vancouver, BC, V6Z 1Y6 Canada. E-mail: ppare{at}mrl.ubc.ca
Chronic obstructive pulmonary disease is characterized by destruction of the lung parenchyma and/or small airway narrowing. To determine whether the dimensions of relatively large airways assessed using computed tomography (CT) reflect small airway dimensions measured histologically, we assessed these variables in nonobstructed or mild to moderately obstructed patients having lobar resection for a peripheral tumor. For both CT and histology, the square root of the airway wall area (Aaw) was plotted versus lumen perimeter to estimate wall thickness. The wall area percentage was calculated as wall area/lumen area + wall area x 100. Although CT overestimated Aaw, the slopes of the relationships between the square root of Aaw and internal perimeter (Pi) measured with both techniques were related (CT slope = 0.2059 histology slope + 0.1701, R2 = 0.32, p < 0.01). The mean wall area percentage measured by CT for airways with a Pi of greater than 0.75 cm predicted the mean dimensions of the small airways with an internal diameter of 1.27 mm (R2 = 0.57, p < 0.01). We conclude that CT measurements of airways with a Pi of 0.75 cm or more could be used to estimate the dimensions of the small conducting airways, which are the site of airway obstruction in chronic obstructive pulmonary disease.
Key Words: bronchioles bronchiolitis chronic obstructive pulmonary disease emphysema small airways
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