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. 2020 Sep 15;297(3):675–684. doi: 10.1148/radiol.2020200302

Figure 4b:

Images show lung cancer screening CT scan in 57-year-old man. (a) Axial and (b) coronal images show right lower-lobe nodule (arrow) classified as Lung CT Screening Reporting and Data System (Lung-RADS) category 3 nodule by all readers using manual measurements and as Lung-RADS 2 nodule by all readers using volumetry. Manual average diameter is 7 mm as measured by two readers and 6 mm as measured by one reader; semiautomated average diameter is 6 mm as measured by two readers and 7 mm as measured by one reader; and semiautomated volume is 91 mm3, 96 mm3, and 99 mm3 as measured by each of three readers. Note the relatively flat nonspherical shape in b. Nodule remains stable on subsequent scans up to 2.5 years later.

Images show lung cancer screening CT scan in 57-year-old man. (a) Axial and (b) coronal images show right lower-lobe nodule (arrow) classified as Lung CT Screening Reporting and Data System (Lung-RADS) category 3 nodule by all readers using manual measurements and as Lung-RADS 2 nodule by all readers using volumetry. Manual average diameter is 7 mm as measured by two readers and 6 mm as measured by one reader; semiautomated average diameter is 6 mm as measured by two readers and 7 mm as measured by one reader; and semiautomated volume is 91 mm3, 96 mm3, and 99 mm3 as measured by each of three readers. Note the relatively flat nonspherical shape in b. Nodule remains stable on subsequent scans up to 2.5 years later.