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Figure 2: Reconstructed CT coronal images (on 0.5-mm retro-reconstructed axial CT data set) show measurements of trachea (a), bronchi (b and c), and right upper lobe bronchus (d) diameters. Tracheal diameter was measured 5 cm above floor of carina; diameters of bronchi and right upper lobe bronchus were measured within 1-2 mm of their origin

Figure 2: Reconstructed CT coronal images (on 0.5-mm retro-reconstructed axial CT data set) show measurements of trachea (a), bronchi (b and c), and right upper lobe bronchus (d) diameters. Tracheal diameter was measured 5 cm above floor of carina; diameters of bronchi and right upper lobe bronchus were measured within 1-2 mm of their origin