SPECT Activity Quantification Accuracy (% Error) with Different Calibration Geometries
| Target | Point source calibration | Hot-sphere calibration | Uniform tank calibration | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VOI radius = 2 pixels | VOI radius = 4 pixels | ||||||||||||
| HE | UHE | HE | UHE | HE | UHE | HE | UHE | ||||||
| 7-mL tumor | 34.3 | 36.5 | 41.5 | 42.4 | 40.8 | 38.5 | 47.7 | 40.7 | |||||
| 16-mL tumor | −0.3 | 5.1 | 10.7 | 13.9 | 9.6 | 8.0 | 20.1 | 11.4 | |||||
| 59-mL tumor | −3.4 | 7.0 | 8.0 | 15.6 | 6.9 | 9.9 | 17.6 | 13.2 | |||||
| 135-mL tumor | −11.7 | −4.1 | 0.5 | 5.5 | −0.6 | −0.9 | 11.0 | 2.8 | |||||
| Liver | −20.8 | −1.1 | −7.5 | 8.3 | −8.8 | 2.0 | 3.8 | 5.6 | |||||
| Kidney | −1.8 | 6.2 | 9.3 | 14.8 | 8.3 | 9.1 | 18.9 | 12.4 | |||||
| Spleen | −12.3 | 0.1 | 0.0 | 9.3 | −1.2 | 3.2 | 10.5 | 6.7 | |||||