Conclusion
The proportion of clinical mild-type patients with COVID-19 was relatively high, screening for COVID-19 with chest CT alone can lead to misdiagnosis in some patients, which would lead to a potential infection risk, so CT was not suitable as an independent screening tool. Visual quantitative analysis based on CT images has high consistency and high diagnostic ability, which can reflect clinical classification; it is expected to accurately assess the clinical severity of COVID-19 and guide the clinical treatment by combining with the clinical information.