Figure 7.

Surgical and interventional therapies in advanced emphysema. Homogeneous emphysema was defined as a <10% difference in emphysematous destruction between the targeted and ipsilateral nontargeted lobe undergoing lung reduction as measured using quantitative chest CT imaging. By contrast, a greater than 10% difference between the targeted and nontargeted lobe is considered a heterogeneous pattern of emphysematous destruction. CT = computed tomography. Reprinted with permission of www.goldcopd.org from Reference 1.