Automated prediction of emphysema visual score using homology-based quantification of low-attenuation lung region
Fig 4
Representative results of HEQ at the 60 threshold levels ranging from −1000 HU to −700 HU.
Note: Results of Fig 4(A)–4(C) were obtained from CT images of Fig 1(A)–1(C), respectively. Abbreviation: HEQ, homology-based emphysema quantification; nb0, the zero-dimensional Betti number normalized by the total number of lung pixel; nb1, the one-dimensional Betti number normalized by the total number of lung pixel.