In COVID-19 patients, considerable variation was found in the QCTmass (72.4±120.8 g; range, 0.7-420.7 g) and relative 3D opacity extent on CT (3.2±5.8% of lung area; range, 0.1-19.8%). 2. Chest radiographs in patients under investigation for COVID-19 provided a sensitivity of 25% (5/20) and specificity of 90% (18/20) for COVID-19-related opacities. 3. The QCTmass (p<.001) and the 3D opacity volume on CT (p<.001) significantly affected the visibility of COVID-19-related opacities on radiographs. I n p r e s s Summary Statement Quantitative opacity mass and 3D opacity volume on CT were quantifiable metrics affecting the visibility of COVID-19-related opacities on chest radiographs.

This erratum corrects an error in the software listed for automatic generation of a volumetric mask of the lungs, lobes, intrapulmonary vessels, and airways. In Quantitative CT analysis, first paragraph, first sentence, the software should be listed as follows: "After uploading CT images from each patient to commercially available segmentation software (MEDIP PRO v2.0.0.0, MEDICALIP Co. Ltd., Seoul, Korea), a deep neural network (Deep Catch v1.0.0.0, MEDICALIP Co. Ltd., Seoul, Korea), automatically generated a volumetric mask of the lungs, lobes, intrapulmonary vessels, and airways. The change was made online on April 6, 2020.

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