Fig. 1

CT images using CareDose 4D combined with Karl 3D technology in the low dose for the follow-up of COVID-19. (A-B) CT images of a 43-year old female. Follow-up with low-dose CT (Fig. A) showed that the lower lobe of the lungs is scattered with thin GGO and the edges are blurred. Tube voltage is 12 0 kV and tube current is 29 mA. After 5 days, follow-up with conventional dose CT (Fig. B), showed slightly absorbed sub-pleural GGO compared to Fig. A. Tube voltage is 120 kV and tube current is 20 mA. (C-D) CT images of a 81-year old female. Follow-up with conventional dose CT (tube voltage of 120KV and tube current of 131 mA) curved grid-like shadows can be seen under the pleura of both lungs, showing crazy-paving pattern (Fig. C), followed by low-dose CT (tube voltage of 20 kV and tube current of 31 mA) follow-up 2 weeks (Fig. D), The symptoms are not obvious, and the arc GGO changes. (E) CT image of a 64-year old male. Low-dose CT follow-up of clearly showed that the lower lobe subpleural crazy-paving pattern and the right lower lung was partially consolidated. (F) CT image of a 38-year old female. Tube voltage 120 kV, tube current 43mAs. Follow-up with low-dose CT showed flaky consolidation in lower lobe of right lung. Dissipative GGO was seen in the surrounding area. Tube voltage is 120 kV and tube current is 33 mA