Figure 2.
Emphysema subtyping with local histogram. Emphysema subtyping using the local histogram approach for a 61-year-old man with advanced emphysema (low-attenuation area percentage, 38.2%), FEV1 percent predicted of 26.7%, and body mass index of 16.6 kg/m2. The top panels show computed tomographic scans for axial and coronal views, and the bottom panels show emphysema subtype labels overlaid on top of the computed tomographic images. Nonemphysematous parenchyma is shown in red, mild centrilobular emphysema (CLE) in yellow, moderate CLE in cyan, confluent CLE in purple, and advanced destructive emphysema in dark blue.