Figure 5From: Quantification of lung surface area using computed tomography Hematoxylin and Eosin-stained Images of Tissue Samples A and B in Figures 2, 3. The tissue shown in A has a SA/V of 247 mm2/mm3 and a CT density of 0.14 g/ml while the area in B has a SA/V of 258 mm2/mm3 and a CT density of 0.24 g/ml. Thus despite comparable SA/V, there is a substantial difference in CT density due to the deposition of extracellular matrix in B. On the other hand, CT cluster analysis (i.e., value D), which relies solely on the size of the low attenuation areas, was comparable in these two regions (0.97 in A and 1.17 in B).Back to article page