Fig. 1From: Automated assessment of functional lung imaging with 68Ga-ventilation/perfusion PET/CT using iterative histogram analysisExample of functional volume delineation in the presence of an airway artifact. Whole lung volume is shown in blue. The aggregated, non-physiological uptake (red) is detected by histogram analysis, and a more representative peak uptake value is designated. The resultant functional volume from 30% threshold is shown in greenBack to article page