Fig. 3From: Lung function imaging methods in Cystic Fibrosis pulmonary diseasePhase contrast X-Ray based images of the airway surface liquid layer before (a), 3Â min (b) and 6Â min (c) after hypertonic saline treatment. Projected ASL thickness estimated from image C (d). Reprinted with permission from Morgan et al. PLoS ONE 2013;8(1):e55822 [69]Back to article page