Fig. 5

A 49-year-old. a NECT scan showing few GGO, the illustrated one was seen at the right upper lobe, clinical and laboratory diagnosis of chest infection, with disappearance of nodule after 2 weeks. b CT histogram for the segmented GGO showed mean density: − 637.2 HU, maximum density: − 308 HU, minimum density: − 880 HU, STD: 110.1, skewness was zero, kurtosis was zero, one peak with peak frequency 30%, and visual assessment of CT histogram of ROI was type