Specimen CT scan | | | | |
Total lung volume L | 1.4 (1.1–1.5)### | 2.3 (2.0–2.5) | 3.4 (3.0–3.6) | <0.0001 |
Lung mass g | 459 (368–591) | 348 (319–395) | 442 (400–471) | 0.11 |
Density g·L−1 | 358 (313–400) ###, ¶¶ | 165 (134–188) | 127 (116–138) | 0.0001 |
Micro-CT | | | | |
Terminal bronchioles n·mL−1 | 2.5 (2.3–2.9) ###, ¶¶ | 5.4 (4.5–6.8) | 5.7 (5.6–6.4) | 0.0004 |
Cross-sectional area of terminal bronchioles mm² | 0.125 (0.100–0.142) ¶ | 0.171 (0.147–0.190) | 0.149 (0.141–0.174) | 0.043 |
Diameter of terminal bronchioles µm | 307 (260–396) | 354 (342–387) | 364 (346–400) | 0.38 |
Total number of terminal bronchioles per lung n | 3071 (2618–3592) ###, ¶¶ | 11165 (10291–16559) | 15864 (11941–20132) | 0.0003 |
Total cross sectional area of terminal bronchioles | 381 (335–408) ##, ¶¶ | 1957 (1691–2857) | 2521 (1815–3189) | 0.0005 |
Mean linear intercept µm | 273 (237–307) | 242 (222–287) | 277 (262–285) | 0.61 |
Tissue % | 42.8 (36.4–54.5) ###, ¶ | 27.8 (23.3–29.2) | 23.5 (22.9–24.4) | 0.0002 |