Fig. 4.

Axial surface of CT images and variations in CT images of different groups. (a) One case of COVID-19 group. The COVID-19-specific patterns of lung infections are denoted by blue boxes, including ground-glass opacities and consolidation. (b) One case of common pneumonia group. The increased and/or disordered lung marking is (denoted by blue boxes) the CT manifestations of early common pneumonia patients. (c) One case of normal control group. The black area is normal lung tissue, and the white dots are normal physiological structures such as blood vessels, bronchi, etc.