Fig. 7

Evolution of the local strain as related to global inflation pressures and volumes. Four intermediate stages of a representative pig lung at 15 BPM inflated to 1350 ml (A) was presented as qualitative strain contours (B) and quantitative histograms (C). Increasing global lung pressure and volumes corresponded to increasing local strain maximum and mean values as well as a larger range of experienced strains. The transition from a right skewed distribution at stage 1 to a more distributed spread of strain values for stages 2–4 was observed and illustrated greater surface heterogeneity