Comparison of Design of Selected Small-Animal PET Systems
| Category | Quad-HIDAC (14,15) | microPET II (11) | VISTA (16) | Inveon (10) | NanoPET/CT |
| Detector | |||||
| Crystal material | Avalanche chamber detector | Lutetium oxyorthosilicate | LYSO:Ce and GSO dual-layer | LSO | LYSO:Ce |
| Crystal size (mm) | 0.4-hole size | 0.975 × 0.975 × 12.5 | 1.45 × 1.45 × 7 LYSO:Ce; 1.45 × 1.45 × 8 GSO | 1.51 × 1.51 × 10 | 1.12 × 1.12 × 13 |
| Crystal pitch (mm) | 0.5-hole pitch | 1.15 | 1.55 | 1.59 | 1.17 |
| Packing fraction | 80% | 72% | 88% | 90% | 92% |
| Crystal array | 311 × 188 holes | 196 (14 × 14) | 169 (13 × 13) | 400 (20 × 20) | 3,159 (81 × 39) |
| System | |||||
| No. of detector blocks/module | 4 | 90 | 36 | 64 | 12 |
| No. of crystals | 233,872 holes | 17,640 | 6,084 × 2 | 25,600 | 37,908 |
| No. of rings | 311 | 42 | 26 | 80 | 81 |
| No. of crystals per ring | 752 | 420 | 234 | 320 | 468 |
| Ring diameter (cm) | 17 | 16 | 11.8 | 16.1 | 18.1 |
| Gantry aperture (cm) | 17 | 15.3 | 8 | 12 | 16.0 |
| Axial FOV (cm) | 28 | 4.9 | 4.8 | 12.7 | 9.48 |
| Transaxial FOV (cm) | 17 | 8 | 6.7 | 10.0 | 12.3 |
| Solid angle/4 π | 0.75 | 0.16 | 0.23 | 0.62 | 0.32 |
| Dataset | |||||
| No. of sinograms | |||||
| 3D | NA | 1764 | NA | 6,400 | 6,561 |
| 2D | NA | 83 | 61 | 159 | 161 |
| Sinogram size | NA | 140 × 210 | 128 × 175 | 128 × 160 | 410 × 240 |
| Sampling distance (mm) | 0.1–1 | 0.575 | NA | 0.815 | 0.3 |
NA = not applicable.