Fig. 2From: Agreement between low-dose and ultra-low-dose chest CT for the diagnosis of viral pneumonia imaging patterns during the COVID-19 pandemicExamples of false positive read-out in ultra-low-dose protocol (upper row-right image) which was due to scan in expiratory-phase resulted in accentuated air-trapping and pseudo-ground glass appearance and was normal in same section of low-dose protocol (upper row-left image). Similar artifact is present in ultra-low-dose images of another case with false read-out of ground glass patch in right lung base (lower row-right image) which was mild atelectasis in low-dose section (lower row-left image)Back to article page