
Keywords: HU، واحد hounsfield; Chest CT; Cystic fibrosis; Trapped air; Reversibility; Quantitative measuresCF, cystic fibrosis; CT, computed tomography; FEF75, forced expiratory flow at 75% of vital capacity; HU, Hounsfield unit; MMEF, maximum mid-expiratory flow; MRSA, methicillian-re