Figure 1From: Can HRCT be used as a marker of airway remodelling in children with difficult asthma?Outer and inner bronchial diameters. Magnified area of an axial HRCT of a child with difficult asthma showing a circular bronchus that was quantified. 1a) outer (Do = 0.5 cm) and 1b) inner (Di = 0.3 cm) bronchial diameters were measured as outlined.Back to article page