Fig. 2.

Three-dimensional volume-rendered reconstructive images showing auto-segmentation of the infected regions based on the quantitative method (anterior to posterior view, the movie is also available in the supplements. Regions in green color stand for ground glass opacity, those in red color stand for consolidation): A, 35 year-old female, with no obvious symptoms, received her first unenhanced chest CT scan 6 days after having contact with people from Wuhan. She was confirmed with COVID-19 pneumonia, and the pneumonia severity index (PSI) was grade I. The infection located in the S6 of the right lower lobe with the visual score of 3 and infection proportion to the whole lung of 0.3%. B, 67 year-old male, fever, cough and chest tightness for 8 days after exposure, received his first unenhanced chest CT scan and confirmed with COVID-19 pneumonia with the PSI of grade III. The infections scattered in all the segments with exception of S10 of the left lower lobe and S7 of the right lower lobe. The visual score was 44 and the infection proportion to the whole lung was 14.6%. C, 46 year-old male, fever, cough, phlegm and muscular ache for 6 days after exposure. He was confirmed with COVID-19 pneumonia with the PSI of grade II. The infections scattered in all the segments with exception of S7+8 of the left lower lobe and S3/S4 of the right upper and middle lobes. The visual score was 35 and the infection proportion to the whole lung was 21.4%. D, 62 year-old male, fever, cough and phlegm for 10 days after exposure. He was confirmed with COVID-19 pneumonia with the PSI of grade IV. The infections scattered in all the segments with exception of S7+8 of the left lower lobe. The visual score was 50 and the infection proportion to the whole lung was 26.6%.