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. 2022 Jan 25;17(1):e0263158. doi: 10.1371/journal.pone.0263158

Fig 2. Pneumonia mask and ventilation defect on CT images.

Fig 2

The cohort is categorized into (a) normal, (b) COVID-19 asymptomatic, (c) symptomatic without dyspnea and (d-e) symptomatic with dyspnea groups. The middle and right columns show pneumonia mask (green-colored layer) and FAN modeled ventilation defect (red-colored layer) on a transverse plane, respectively.