Table 3 NEMA data on PET scanners available on the market
From: Performance characteristics of silicon photomultiplier based 15-cm AFOV TOF PET/CT
GE Healthcare | Siemens Healthcare | Philips Healthcare | ||||||
|---|---|---|---|---|---|---|---|---|
Parameter | Discovery MI 3 PET/CT (this work) | Discovery MI 4 PET/CT [3] | Signa PET/MR [14] | Discovery 690/710 PET/CT [6] | Biograph mCT Flow PET/CT [9] | Biograph mMR PET/MR [16] | Vereos Digital PET/CT [17] | Ingenuity TF 128 PET/CT [10] |
Axial FOV (cm) | 15 | 20 | 25 | 15.7 | 22.1 | 25.8 | 16.4 | 18 |
Transverse FOV (cm) | 70 | 70 | 60 | 70 | 70 | 59.4 | 67.6 | 67.6 |
Detector ring diameter (cm) | 74.4 | 74.4 | 62.4 | 81 | 84.2 | 65.6 | 76.4 | 90 |
Crystal thickness (mm) | 25 | 25 | 25 | 25 | 20 | 20 | 19 | 22 |
Spatial resolution FWHM (FBP) | ||||||||
Radial, 1 cm | 4.69 | 4.1 | 4.46 | 4.70a | 4.33a | 4.3a | 4.11a | 4.84a |
Tangential, 1 cm | 4.08 | 4.19 | 4.08 | 4.70a | 4.33a | 4.3a | 4.11a | 4.84a |
Axial, 1 cm | 4.68 | 4.48 | 5.35 | 4.74 | 4.25 | 4.3 | 3.96 | 4.73 |
Radial, 10 cm | 5.58 | 5.47 | 5.81 | 5.34 | 5.16 | 5.2 | NA | 5.25 |
Tangential, 10 cm | 4.64 | 4.49 | 4.44 | 4.79 | 4.72 | 4.8 | NA | 5.01 |
Axial, 10 cm | 5.83 | 6.01 | 6.75 | 5.55 | 5.85 | 6.6 | NA | 5.23 |
Radial, 20 cm | 7.53 | 7.53 | 8.42 | NA | 5.55 | NA | 5.79 | NA |
Tangential, 20 cm | 5.08 | 4.9 | 5.27 | NA | 6.48 | NA | 5.79 | NA |
Axial, 20 cm | 5.47 | 6.1 | 7.3 | NA | 7.8 | NA | 6.2 | NA |
Sensitivity at centre of FOV (cps/kBq) | 7.258 | 13.7 | 22.9 | 7.4 | 9.6 | 15 | 5.7 | 7.39 |
Counting rate statistics | ||||||||
Peak NECR (kcps) | 102.3 | 193.4 | 214.8 | 139.1 | 185 | 184 | 171 | 124.1 |
Peak NEC activity (kBq/ml) | 23 | 21.9 | 17.6 | 29 | 29 | 23.1 | 50 | 20.3 |
Peak NEC scatter fraction (%) | 41.2 | 40.6 | 42.5 | 37 | 33.5 | 37.9 | 30 | 36.7 |
Maximum absolute error (%) | 3.88 | 3.14 | 3.5 | 2.09 | 3.7 | 5.5 | NA | NA |
Contrast recovery in spheres | ||||||||
10 mm | 47.4 | 53.7 | 36.5 | 44 | 28.5 | 32.5 | 62 | 17 |
13 mm | 59.3 | 64 | 50.6 | 56 | 42.3 | 50 | NA | 46 |
17 mm | 67.0 | 73.1 | 60 | 65 | 58.4 | 62.9 | NA | 58 |
22 mm | 77.0 | 82.7 | 68.6 | 75 | 71.7 | 70.8 | 88 | 63 |
28 mm | 82.5 | 86.8 | 80.7 | 87 | 70.1 | 65.1 | 86 | 68 |
37 mm | 85.1 | 90.7 | 88.6 | 89 | 78.3 | 72.3 | 89 | 68 |
Timing resolution (ps) | 375.6 | 375.4 | 390 | 544.3 | 555b | 2930 | 316 | 502 |
Energy resolution (%) | 9.3 | 9.4 | 10.5 | 12.4 | NA | 14.5 | 11.1 | 11.1 |