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 | |||||||