RESULTS
Of these 139 cases, 103 cases were confirmed for COVID-19 and 36cases
were confirmed other diseases(including other pneumonia, pulmonary
hemorrhage, pulmonary edema and traumatic wet lung). The sensitivity,
specificity and accuracy of CT are 83.33%, 20.39%, 80.58%, Of the 103
COVID-19 cases, 82(79.61%) cases were typical cases and
21(20.39%)cases were atypical cases. 65(63.11% ) cases were in the
early or advanced stage, 26(25.24%) cases were in the severe or
recovery stage, and 12(11.65%)were in multiple stages. Two radiologists
scored the imaging signs of secondary pulmonary lobular structure of
COVID-19 and other diseases. By comparing the image features of typical
cases and atypical cases, there was statistical difference between the
size <3cm, the density of GGO and consolidation, but there was
no statistical difference between the size > 3cm and the
density of mixed GGO, there is significant statistical difference
between typical cases and atypical cases of distribution and location.
The scores of secondary pulmonary lobular structure in typical COVID-19
(3.42±1.25) were significant different compared with atypical COVID-19
(1.51±1.34, P<0.001). The inter-observer agreement for the
score of secondary pulmonary lobular structure was excellent (kappa =
0.863, P<0.05). The diagnosis of typical CT features (Fig. 3)
and atypical CT features (Fig. 4) in COVID-19 are shown in table 2.The
evaluation results of dynamic multi-stage images (Fig. 5) and
differential diagnosis with non- COVID-19(Fig. 6) based on the image
signs of secondary pulmonary lobular structure are shown in and table 3.