Calibration Factors for Kidneys (CFK), Spheres (CFS), and Reference
| Isotope | VOI | Newborn | 1-y-old | 5-y-old | Adult | Reference |
| 99mTc | CFK (MBq−1s−1) | 170.32 | 178.97 | 181.83 | 186.32 | 186.29 ± 2.26 |
| ∆K-Ref (%) | 8.6 | 3.9 | 2.4 | 0.018 | ||
| CFS (MBq−1s−1) | 169.16 | 178.20 | 182.06 | 186.34 | ||
| ∆S-Ref (%) | 9.2 | 4.3 | 2.3 | 0.029 | ||
| ∆S-K (%) | 0.69 | 0.43 | 0.13 | 0.011 | ||
| 177Lu | CFK (MBq−1s−1) | 25.01 | 25.63 | 26.14 | 26.96 | 26.94 ± 0.08 |
| ∆K-Ref (%) | 7.2 | 4.8 | 3.0 | 0.089 | ||
| CFS (MBq−1s−1) | 24.77 | 25.59 | 26.12 | 26.95 | ||
| ∆S-Ref (%) | 8.0 | 5.0 | 3.0 | 0.068 | ||
| ∆S-K (%) | 0.96 | 0.17 | 0.052 | 0.021 | ||
| 131I | CFK (MBq−1s−1) | 82.24 | 86.22 | 88.57 | 90.54 | 90.17 ± 0.59 |
| ∆K-Ref (%) | 8.8 | 4.4 | 1.8 | 0.41 | ||
| CFS (MBq−1s−1) | 81.33 | 85.76 | 88.28 | 90.40 | ||
| ∆S-Ref (%) | 9.8 | 4.9 | 2.1 | 0.26 | ||
| ∆S-K (%) | 1.1 | 0.53 | 0.33 | 0.16 |
∆K-Ref = kidney percentage difference from attenuation-free reference; ∆S-Ref = sphere percentage difference from attenuation-free reference; ∆S-K = deviation between CFS and CFK.