Table 1. Specific activities and sphere-to-background-ratios used in PET-measurements.
| Measurement 1 | Measurement 2 | Measurement 3 | Measurement 4 | Measurement 5 | ||
| Asphere [kBq/ml] | 462 | 49.3 | 41.0 | 31.3 | 25.6 | |
| F-18 | ABG [kBq/ml] | 0 | 0 | 2.2 | 2.2 | 2.1 |
| S∶BG | – | – | 18.6∶1 | 14.2∶1 | 12.2∶1 | |
| Asphere [kBq/ml] | 570 | 60.1 | 44.2 | 32.5 | 23.9 | |
| Ga-68 | ABG [kBq/ml] | 0 | 0 | 2.2 | 2.2 | 2.4 |
| S∶BG | – | – | 20.1∶1 | 14.8∶1 | 9.9∶1 | |
| Asphere [kBq/ml] | 475 | 39.4 | 39.2 | 28.8 | 20.7 | |
| I-124 | ABG [kBq/ml] | 0 | 0 | 1.9 | 1.9 | 2.1 |
| S∶BG | – | – | 20.4∶1 | 15.3∶1 | 9.9∶1 | |
| Purpose | SNR | RC; Comparison of Sinograms | RC and contrast; Comparison of Sinograms | RC and contrast; Comparison of Sinograms | RC and contrast; Comparison of Sinograms |
(SNR: Signal-to-noise ratio, RC: recovery coefficient).