Table 2.
Specifications of the developed human total body PET systems in the Explorer project
| System | Penn PET Explorer | uExplorer |
|---|---|---|
| Scintillator | LYSO | LYSO |
| Readout | SiPM (digital) | SiPM |
| Scintillator size (mm3) | 3.86 × 3.86 × 19 | 2.76 × 2.76 × 18.1 |
| Total number of detector pixels | 564,480 | |
| Bore/detector diameter | 70/81 | 68.6/78.6 |
| Axial length (cm) | 70/140 | 194.8 |
| Resolution (FWHM in mm) | ||
| Transaxial | 4.0 | 3.0 |
| Axial | 4.0 | 3.0–3.5 |
| Energy res. (%) | 10 | 11.7 |
| Energy window | 440-660 | 430-645 |
| Scatter fraction (%) | ||
| NU2-2012 | 32 | 35.8 |
| Sensitivity | ||
| kcps/MBq NU-2 | 55 | 191.5 (@0 cm) |
| Coincidence window (ns) | 5 ns | 4.5-6.9 ns (ring difference dependent) |
| TOF resolution (in ps) | 250 ps | 505 ps |
| Peak NEC (kcps) | ||
| NU-2 -2012 (70-cm phantom) | >1200 kcps (for incomplete 70-cm system) | 1435 kcps@16.8 kBq/cc |
| (175-cm phantom) | 1718 kcps@8.0 kBq/cc | |