1. Validation of two-dimensional and three-dimensional measurements of subpleural alveolar size parameters by optical coherence tomography

    Validation of two-dimensional and three-dimensional measurements of subpleural alveolar size parameters by optical coherence tomography

    Optical coherence tomography (OCT) has been increasingly used for imaging pulmonary alveoli. Only a few studies, however, have quantified individual alveolar areas, and the validity of alveolar volumes represented within OCT images has not been shown. To validate quantitative measurements of alveoli from OCT images, we compared the cross-sectional area, perimeter, volume, and surface area of matched subpleural alveoli from microcomputed tomography (micro-CT) and OCT images of fixed air-filled swine samples. The relative change in size between different alveoli was extremely well correlated ( r > 0.9 , P < 0.0001 ), but OCT images underestimated absolute sizes compared to micro-CT by 27 ...

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