Fig 1.
Inclusion chart of patients.
Fig 2.
Automated lobe segmentation process and quantification of emphysema per lobe in a 45-year-old woman with COVID-19 pneumonia.
(a./b./d.) Sequential segmentation of airways, lungs, and lobes. (c) Results of volumetric measurement of emphysema in both lungs, each lung, and each lobe (attenuation threshold of voxels, <-950 HU). Emphysematous voxels are shown in red. Reprinted under a CC BY license, with permission from Philips Healthcare, original copyright [2021].
Fig 3.
Manual ROI measurements in the left upper lobe of a 45-year-old woman with COVID 19 pneumonia at initial CT scan (a.) and at follow-up CT scan after 45 days (b.), a decreasing in attenuation values by -27 HU can be seen between initial scan and follow-up.
Table 1.
Demographic characteristics of n = 32 patients with RT-PCR proven coronavirus disease.
Table 2.
Demographic characteristics and quantitative measurements of n = 32 patients with RT-PCR proven coronavirus disease categorized by follow-up interval </> 30 days.
Fig 4.
Automated measured significantly higher amount of emphysema volume in follow-up CT scans >30 days as compared to the initial CT scan.
Fig 5.
Boxplot for attenuation values.
Manually measured attenuation values by ROIs in unaffected lung areas show no differences in the groups >30 days and < 30 days between initial CT scan (white) and follow-up CT scans (grey).