Abstract: Objective  To analyze the CT manifestation of the chest thinlayer CT of patients with Coronavirus Disease 2019(COVID19),  analyze its evolution process,  familiarize with the CT manifestations of the lungs,  and to understand the characteristics of the course of the disease. Methods  The data of 64 patients diagnosed with COVID19 by nucleic acid detection in our hospital from January 2020 to March 2020 were collected,  and the chest thinlayer CT manifestation was analyzed. All 64 patients underwent 5 chest CT scans,  4 cases of which showed no abnormalities in lung CT,  and the CT evolution characteristics of the other 60 patients were studied. Results  The CT findings of Covid19 were variable,  and the main manifestations were asymmetric distribution of both lungs,  consolidation under pleura or ground glass density shadow. At first,  the paving stone sign was more common,  and then it changed to the blur shadow and the strip shadow. In this group of patients,  lung lesions increased significantly in the first and second weeks after the onset of symptoms. Subsequently,  the CT scores of the lungs gradually decreased,  and the CT scores of the lower lobes of both lungs were higher,  followed by the upper lobe of the right lung,  and the upper lobe of the left lung had the lowest CT score. Conclusion  In most cases of COVID19,  the lung lesions disappeared completely in about 28 days,  but we needed  to follow up with large samples for a long time to observe whether the lungs would have irreversible damage.

Key words: pneumonia, , viral；novel coronavirus pneumonia, thinlayer CT