Percent Contrast, Background Variability, and Average Lung Residual for L/B = 8
| Sphere size (mm) | Contrast (%) | Background variability (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2i × 8s* | 4i × 14s† | FBP (relative deviation) | 2i × 8s* | 4i × 14s† | FBP | |||||
| 10 | 30 | 52 | 46 (1.0) | 2.7 | 4.3 | 5.5 | ||||
| 13 | 45 | 60 | 55 (1.4) | 2.4 | 3.4 | 3.5 | ||||
| 17 | 63 | 73 | 68 (1.5) | 2.2 | 3.2 | 2.4 | ||||
| 22 | 72 | 77 | 74 (0.7) | 2.1 | 3.3 | 2.0 | ||||
| 28 | 51 | 66 | 69 (5.4) | 2.1 | 3.6 | 1.9 | ||||
| 37 | 52 | 70 | 72 (5.6) | 2.0 | 3.5 | 1.6 | ||||
| Average residual (%) over lung insert | 34 | 16 | 16 | |||||||