Population and CT image data acquisition
We retrospectively reviewed 139 cases that were collected from January
26 to February 10, 2020.Among them, 103 patients were confirmed as
COVID-19 patients by nose or throat swab sampling. The data
characteristics of all patients are shown in Table 1.Patients were
examined using the conventional CT(16-slice or 64-slice CT) machines.
Scanning parameters and tube voltage were set to automatic mode for
chest. Images were reconstructed using the best electronic voltage
measured, with 5 millimeter slice thickness, and 5 millimeter slice
interval. This study is approved by our Institutional Review Board,
which is waived the requirement for patients’ informed consent referring
to the CIOMS guideline.