Table 4 Image quality data of the NIM PET/CT phantom on three PET/CT systems
PET/CT system | Sphere size (mm) | Contrast (%) | Background variability (%) | Residual error (%) |
|---|---|---|---|---|
A | 37 | 80.27 | 2.78 | 7.46 |
28 | 74.14 | 3.18 | ||
22 | 78.28 | 3.52 | ||
17 | 74.59 | 3.82 | ||
13 | 63.12 | 4.17 | ||
10 | 39.95 | 4.5 | ||
7 | 5.61 | 4.78 | ||
4 | – | – | ||
B | 37 | 82.61 | 1.9 | 8.45 |
28 | 76.75 | 2.42 | ||
22 | 72.8 | 2.98 | ||
17 | 72.3 | 3.68 | ||
13 | 61.9 | 4.53 | ||
10 | 43.26 | 5.5 | ||
7 | 24.38 | 6.78 | ||
4 | – | – | ||
C | 37 | 93.26 | 2.09 | 3.24 |
28 | 87.21 | 2.69 | ||
22 | 81.12 | 3.05 | ||
17 | 78.54 | 3.76 | ||
13 | 72.08 | 5.01 | ||
10 | 71.27 | 6.49 | ||
7 | 20.06 | 7.3 | ||
4 | 3.22 | 10.01 |