Fig. 2

Morphological parameters of bronchiectasis. A Outer diameter, B Inner diameter. In the patients with IPF, the outer and inner diameters decreased linearly toward the distal part of the bronchus. In contrast, some bronchi were larger at the distal part, and the outer and inner diameter measurements of a generation of the bronchi were largely different between the patients with NTM. C WA%, D T/D ratio. WA% and T/D ratio in most of the NTM patients increased linearly toward the distal part of the bronchus although the values were diverse between the subjects. In the patients with IPF, larger values of WA% and T/D ratio were observed at the distal part