Figure 1. Scatter plot of the fraction of CT voxels with attenuation values less than −950 Hounsfield Units (F-950) plotted on the X-axis and the right upper apical lobe bronchus wall area as a percentage of total airway area (WA%) plotted on the Y-axis.
Tertiles of F-950 and WA% are demarcated by the dotted vertical and horizontal lines within the scatter plot with the mean FEV1 percent predicted (FEV1%) values represented in the corresponding color-coded grid. No association exists between F-950 and WA% (r = −0.055, p = 0.40) and the severity of parenchymal emphysema and airway disease cannot be predicted based on FEV1 alone.