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. 2020 Dec 17;159(5):1833–1842. doi: 10.1016/j.chest.2020.12.007

Figure 1.

Figure 1

A-D, Case example of a suitable patient with COPD for bronchoscopic lung volume reduction with the use of one-way endobronchial valves. A, Inspiration chest CT scan shows lower lobe predominant heterogeneous emphysema; B, expiration chest CT scan shows predominant air trapping in the left lower lobe; C, perfusion scan confirms the left lower lobe target by absence of perfusion; D, quantitative CT analysis shows percentage of emphysematous destruction (at −950 Hounsfield Units), lobar volumes, and fissure integrity.