Table 2 Comparison of system characteristics across manufacturer PET/CT systems
From: Performance evaluation of the next generation solid-state digital photon counting PET/CT system
Manufacture | GE | GE | Philips | Philips | Philips | Siemens | Siemens | Toshiba |
|---|---|---|---|---|---|---|---|---|
PET/CT model | Discovery MI (4-ring) [51] | Discovery 690 [43] | Vereos (this work) | Ingenuity TF [44] | Gemini T [42] | Biograph mCT flow [45] | ||
Photo detector | SiPM | PMT | SiPM | PMT | PMT | PMT | PMT | PMT |
Number of detectors | 9792 | 256 | 23,040 | 420 | 560 | 768 | 768 | 480 |
Scintillator | LYSO | LYSO | LYSO | LYSO | LYSO | LSO | LSO | LYSO |
Number of crystals | 19,584 | 13,824 | 23,040 | 28,336 | 28,336 | 32,448 | 32,448 | 30,720 |
Crystal size (mm3) | 3.95 × 5.3 × 25 | 4.2 × 6.3 × 25 | 3.86 × 3.86 × 19 | 4 × 4 × 22 | 4 × 4 × 22 | 4 × 4 × 20 | 4 × 4 × 20 | 4 × 4 × 12 |
Ring diameter (cm) | 74.4 | 81.0 | 76.4 | 90.0 | 90.3 | 84.2 | 84.2 | 88.0 |
Axial FOV (cm) | 20.0 | 15.7 | 16.4 | 18.0 | 18.0 | 22.1 | 22.1 | 19.6 |
Plane spacing (mm) | n/a | n/a | 1, 2, or 4 | 2 or 4 | 2 or 4 | 2 | 2 | 2 |
TOF Timing resolution (ps) | 375 | 544 | 322 | 502 | 585 | 555 | 527 | 410 |
Sensitivity (cps/kBq) | 13.7 | 7.4 | 5.7 | 7.3 | 6.6 | 9.6 | 9.7 | 4.0 |
Transverse resolution @ 1Â cm (mm) | 4.1 | 4.7 | 4.0 | 4.8 | 4.8 | 4.3 | 4.4 | 5.1 |
Transverse resolution @ 10Â cm (mm) | 5.0 | 5.1 | 4.4 | 5.1 | 5.2 | 4.9 | 4.9 | 5.1 |
Axial resolution @ 1Â cm (mm) | 4.5 | 4.7 | 4.0 | 4.7 | 4.8 | 4.3 | 4.4 | 5.0 |
Axial resolution @ 10Â cm (mm) | 6.0 | 5.6 | 4.8 | 5.2 | 4.8 | 5.9 | 5.7 | 5.4 |
Peak NECR (kcps @ kBq/mL) | 193.4 @ 21.9 | 139.1 @ 29.0 | 171 @ 50.5 | 124.1 @ 20.3 | 125 @ 17.4 | 185 @ 29 | 156 @ 31.1 | ≥51 @ n/a |
Energy resolution (%) | 9.4 | 12.4 | 11.2 | 11.1 | 11.5 | n/a | 11.5 | 11.3 |
Scatter fraction at peak NECR (%) | 40.6 | 37 | 30.8 | 36.7 | 27 | 33.4 | 32.7 | 42.7 |