Percentage of PDAs in Collimators with Different Crystal Pixel Sizes, Hole Diameters, and Septal Lengths
| Type of collimator | Hole diameter (mm) | Pixel size (mm2) | ||
| 1 | 4 | 9 | ||
| High sensitivity | 0.5 | 26.69 | 66.63 | 80.34 |
| 1 | 9.13 | 28.62 | 51.95 | |
| 1.5 | 3.41 | 12.62 | 25.27 | |
| General purpose | 0.5 | 41.81 | 80.62 | 85.06 |
| 1 | 16.41 | 46.85 | 75.57 | |
| 1.5 | 6.76 | 23.86 | 44.48 | |
| High resolution | 0.5 | 56.84 | 81.05 | 88.57 |
| 1 | 28.03 | 65.33 | 87.33 | |
| 1.5 | 11.55 | 37.83 | 65.27 | |
Septal thickness of collimators was 0.2 mm.