Image Quality Measurements Reconstructed with OSEM-TOF Using 8 Iterations and 5 Subsets or Using 4 Iterations and 5 Subsets
| 4: 1 sphere-to-background ratio | 8: 1 sphere-to-background ratio | |||
|---|---|---|---|---|
| Sphere diameter | Contrast recovery (%) | Background variability (%) | Contrast recovery (%) | Background variability (%) |
| 8 iterations, 5 subsets | ||||
| 10 | 60.11 | 3.19 | 64.07 | 2.73 |
| 13 | 64.52 | 2.58 | 70.88 | 2.37 |
| 17 | 74.33 | 1.87 | 82.60 | 1.85 |
| 22 | 78.02 | 1.52 | 84.45 | 1.41 |
| 28 | 82.83 | 1.27 | 87.88 | 1.01 |
| 37 | 85.23 | 0.99 | 91.05 | 0.87 |
| Average lung residual error (%) | 2.41 | 2.55 | ||
| 4 iterations, 5 subsets | ||||
| 10 | 56.35 | 2.46 | 61.95 | 2.14 |
| 13 | 61.52 | 2.04 | 68.99 | 1.88 |
| 17 | 72.26 | 1.54 | 80.94 | 1.51 |
| 22 | 76.33 | 1.28 | 83.09 | 1.2 |
| 28 | 81.35 | 1.1 | 86.69 | 0.91 |
| 37 | 84.24 | 0.9 | 90.16 | 0.81 |
| Average lung residual error (%) | 4.89 | 5.13 | ||