As of February 13, the journal Radiology has published several articles on the imaging features of COVID-19 [9–12], but all of them are descriptive analyses. In February 2020, the Chinese Society of Radiology issued the radiologic diagnosis of pneumonia with COVID-19. CT plays an important role in the screening and diagnosis of COVID-19. The first edition of the experts [13] divided CT manifestations into three stages: early, progressive, and severe according to the extent and features of the pulmonary abnormalities. However, it did not clarify the relationship between the extent of inflammation and the clinical presentation of the patient. In this study, we used a simple convenient method to quantify the imaging findings.