Figure 2

Examples of improved segment; (A,B) (a 61-year-old woman) and residual hypoperfused segment; (C,D) (a 51-year-old man). (A) Lung perfusion blood volume (LPBV) before treatment shows a perfusion decrease in the right S3. (B) The perfusion improved after treatment. (C) LPBV before treatment shows a perfusion decrease in the right S2. (D) Perfusion decrease remains even after treatment.