Airway dimensions measured from micro-computed tomography and high-resolution computed tomography

J. R. Dame Carroll, A. Chandra, A. S. Jones, N. Berend, J. S. Magnussen, G. G. King*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Volume averaging results in both over- and underestimation of airway dimensions when they are measured by high-resolution computed tomography (HRCT). The current authors calibrated computerised measurements of airway dimensions from HRCT against a novel three-dimensional micro-computed tomography (CT) standard, which has a 50-fold greater resolution, as well as against traditional morphometry. Inflation-fixed porcine lung cubes were scanned by HRCT and micro-CT. A total of 59 lumen area (Ai), 30 wall area (Aaw) and 11 lumen volume (Vi) measurements were made. Ai was measured from the cut surface of 11 airways by morphometry. Airways in scanned images were matched using branching points. After calibration, the errors of Ai, Aaw and Vi HRCT measurements were determined. The current authors found a systematic, size-dependent underestimation of Ai and over-estimation of Aaw from HRCT measurements. This was used to calibrate an HRCT measurement algorithm. The 95% limits of agreement of subsequent measurements were ±3.2 mm2 for Ai, ±4.3 mm2 for Aaw, and ±11.2 mm3 for Vi with no systematic error. Morphometric measurements agreed with micro-CT (±2.5 mm2) without systematic error. In conclusion, micro-computed tomography image data from inflation-fixed airways can be used as calibration standards for three-dimensional lumen volume measurements from high-resolution computed tomography, while morphometry is acceptable for two-dimensional measurements. The image dataset could be used to validate other developmental three-dimensional segmentation algorithms.

Original languageEnglish
Pages (from-to)712-720
Number of pages9
JournalEuropean Respiratory Journal
Volume28
Issue number4
DOIs
Publication statusPublished - Oct 2006
Externally publishedYes

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