Figure 6

Density curves, uncompensated for subjects and simulated for phantom activity distributions. (a) Density curves of the 14 examined healthy subjects: S1 to S4 (green) and S5 to S13 (black), together with the excluded subject (black dash-dott-dott-dotted) and the two patients (red). (b) Density curves based on the phantom lung activity distributions that were entirely uniform (solid black line), partly uniform/partly heterogeneous (dotted black line) (with equal activity concentration in the healthy, uniform regions), and entirely heterogeneous (red line).