Figure 7

Graphs comparing the different metrics for detecting emphysema. A: Percentage of image pixels with HU values below two standard deviations from the mean of the control group. B: Coefficient of variation (CoV). C: The average distance of each individual rat’s variogram from the mean of the control group. The x-axis labels are animal numbers: 100s are controls, 200s are full-lung-dose, and 300s are single-lobe-dose. 301 and 302 received the dose in the right caudal lobe, and 303 received the dose in the distal region of the left lobe (Figure 2C).