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 | Â | 564,480 |
Bore/detector diameter | 70/81 | 68.6/78.6 |
Axial length (cm) | 70/140 | 194.8 |
Resolution (FWHM in mm) | Â | Â |
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 | Â | Â |
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) | Â | Â |
NU-2 -2012 (70-cm phantom) | >1200 kcps (for incomplete 70-cm system) | 1435 kcps@16.8 kBq/cc |
(175-cm phantom) | Â | 1718 kcps@8.0 kBq/cc |