Unenhanced chest CT scans were performed using a six-row multidetector CT scanner (SOMATOM Emotion 6; Siemens, Erlangen, Germany) with the following parameters: tube voltage, 130 kVp; effective current, 95mA; collimation, 6 x 2 mm, helical pitch, 1.4; field of view, 38 cm; matrix size, 512 x 512. A 1.0-mm thick slice with a 1.0-mm slice increment was reconstructed before analysis. Scanning was performed in the supine position at full inspiration. All patients underwent CT scan within 4 days after symptom onset for symptomatic patients, early to intermediate phase for radiologic manifestations of COVID-19 [14 (link)].
CT image analysis data was performed as per the previously published reports for the patients included in this study [13 (link)]. Evaluation included the following parameters [15 (link)]: the presence or absence of pure ground-glass opacity (GGO), crazy-paving pattern (GGO with inter- or intralobular septal thickening), consolidation, findings compatible with organizing pneumonia (i.e., consolidation with volume loss, subpleural curvilinear lines, and/or reversed halo sign) [16 (link)], and vascular enlargement inside the opacities. The number of affected lobes and anterior or posterior predominance was also recorded.
CT image analysis data was performed as per the previously published reports for the patients included in this study [13 (link)]. Evaluation included the following parameters [15 (link)]: the presence or absence of pure ground-glass opacity (GGO), crazy-paving pattern (GGO with inter- or intralobular septal thickening), consolidation, findings compatible with organizing pneumonia (i.e., consolidation with volume loss, subpleural curvilinear lines, and/or reversed halo sign) [16 (link)], and vascular enlargement inside the opacities. The number of affected lobes and anterior or posterior predominance was also recorded.
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