Percentage Contrast, Background Variability, and Average Lung Residual for n = 8
Sphere size (mm) | Contrast (%) | Background variability (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
2i × 8s* | 4i × 16s† | FBP (relative deviation) | 2i × 8s* | 4i × 16s† | FBP | |||||
10 | 15 | 25 | 25 (3.3) | 5.1 | 7.4 | 8.7 | ||||
13 | 24 | 34 | 32 (2.3) | 5.0 | 6.6 | 7.2 | ||||
17 | 36 | 43 | 42 (4.0) | 4.8 | 6.0 | 6.0 | ||||
22 | 48 | 53 | 51 (1.7) | 4.7 | 5.5 | 5.4 | ||||
28 | 46 | 62 | 71 (3.5) | 4.6 | 5.2 | 4.9 | ||||
37 | 44 | 55 | 56 (11) | 4.5 | 4.9 | 4.2 | ||||
Lung (average relative error) | 32 | 13 | 0 |