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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] Biograph mCT [46, 47] Celesteion [48,49,50]
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 @ 1 cm (mm) 4.1 4.7 4.0 4.8 4.8 4.3 4.4 5.1
Transverse resolution @ 10 cm (mm) 5.0 5.1 4.4 5.1 5.2 4.9 4.9 5.1
Axial resolution @ 1 cm (mm) 4.5 4.7 4.0 4.7 4.8 4.3 4.4 5.0
Axial resolution @ 10 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