Table 2 Performance parameters of the PET component of the PET/CT Vereos with or without an 8 mm PMMA biocontainment tube within the bore defined by NEMA NU2-2012 measurements including energy and timing resolution, spatial resolution, sensitivity, count rates and scatter fractions
Parameter | Without tube | With 8 mm tube | Manufacturer guidelines |
|---|---|---|---|
Energy resolution (%) | 11 | 11.03 | ≤ 13 |
Timing resolution (ps) | 311.82 | 312 | ≤ 390 |
Spatial resolution (FWHM) | |||
Transverse, 1 cm | 4.03 ± 0.11 | 3.96 ± 0.14 | < 4.9 |
Transverse, radial, 10 cm | 4.59 ± 0.09 | 4.62 ± 0.09 | < 5.5 |
Transverse, radial, 20 cm | 5.77 ± 0.04 | 5.8 ± 0.04 | < 7.2 |
Transverse, tangential, 10 cm | 4.33 ± 0.02 | 4.34 ± 0.03 | < 5.5 |
Transverse, tangential, 20 cm | 4.94 ± 0.05 | 4.89 ± 0.05 | < 7.2 |
Axial, 1 cm | 4.06 ± 0.46 | 4.29 ± 0 | < 4.9 |
Axial, radial, 10 cm | 4.29 ± 0.12 | 4.43 ± 0.10 | < 5.5 |
Axial, radial, 20 cm | 4.64 ± 0.07 | 4.7 ± 0.13 | < 7.2 |
Sensitivity (cps/GBq) | |||
Centered | 6.22 | 5.21 | ≥ 5.1 |
10 cm Off-centered | 6.17 | 5.34 | ≥ 5.1 |
Count rates and scatter fractions | |||
Peak true count rate (kcps) | 660 @51.7 kBq/mL | 595.59 @51.3 kBq/mL | > 675.000 |
Peak NECR rate (kcps) | 161,8 @51.75 kBq/mL | 173.63 @51.35 kBq/mL | > 148.000 |
Location of NECR peak (kBq/mL) | 51.75 | 51.35 | > 25.000 |
Scatter fraction (%) at low count | 31 @0.14 kBq/mL | 31,2 @0.14 kBq/mL | |
Scatter fraction (%) at NECR peak | 33.12 | 33 | ≤ 35.00 |
Max relative count rate error (%) | 6.01 | 5.06 | < 12.00 |
Image quality (%) | |||
10 mm 4:1 | 59.9 | 82.9 | > 26 |
13 mm 4:1 | 75.4 | 78.0 | > 40 |
17 mm 4:1 | 96.6 | 83.8 | > 50 |
22 mm 4:1 | 90.3 | 91.4 | > 60 |
28 mm cold | 84.1 | 79.5 | > 68 |
37 mm cold | 85.4 | 87.1 | > 70 |
Variability (%) | |||
10 mm 4:1 | 9.5 | 8.8 | < 11 |
13 mm 4:1 | 7.7 | 7.3 | < 9 |
17 mm 4:1 | 6.1 | 5.9 | < 8 |
22 mm 4:1 | 4.6 | 4.5 | < 8 |
28 mm cold | 3.3 | 3.5 | < 7 |
37 mm cold | 2.2 | 2.8 | < 7 |
Lung residual | 6.5 | 5.8 | ≤ 15 |