TABLE I:
The average(± standard deviation) MAE(%) and NRMSE(%) across 3 noise realizations of 177Lu XCAT phantoms.
| MAE(%) | ||||
| Lesion/Organ | OSEM | Sequential | Truncation | End2end |
| Lesion 1 (67mL) | 12.5 ± 0.6 | 6.7 ± 1.8 | 2.8 ± 0.9 | 2.1 ± 1.1 |
| Lesion 2 (10mL) | 20.2 ± 0.9 | 11.5 ± 4.1 | 10.8 ± 0.9 | 9.7 ± 1.1 |
| Lesion 3 (9mL) | 25.6 ± 0.6 | 18.8 ± 0.4 | 15.2 ± 0.9 | 12.8 ± 1.0 |
| Lesion 4 (5mL) | 43.0 ± 0.6 | 40.0 ± 1.2 | 38.8 ± 0.8 | 38.7 ± 0.7 |
| Liver | 6.4 ± 0.7 | 6.2 ± 1.5 | 4.6 ± 1.1 | 3.7 ± 1.2 |
| Lung | 2.4 ± 0.7 | 2.2 ± 0.4 | 0.7 ± 0.6 | 0.9 ± 0.5 |
| Spleen | 14.2 ± 0.9 | 12.6 ± 2.4 | 8.9 ± 0.7 | 9.3 ± 1.5 |
| Kidney | 15.9 ± 1.0 | 15.1 ± 1.2 | 14.4 ± 1.4 | 13.6 ± 1.6 |
| NRMSE(%) | ||||
| Lesion/Organ | OSEM | Sequential | Truncation | End2end |
| Lesion 1 (67mL) | 27.3 ± 0.3 | 21.7 ± 1.3 | 18.9 ± 0.6 | 18.3 ± 0.6 |
| Lesion 2 (10mL) | 26.8 ± 0.6 | 19.2 ± 2.2 | 16.4 ± 0.4 | 16.3 ± 0.8 |
| Lesion 3 (9mL) | 28.4 ± 0.4 | 22.8 ± 0.8 | 18.3 ± 0.7 | 16.3 ± 0.7 |
| Lesion 4 (5mL) | 43.5 ± 0.5 | 41.1 ± 1.3 | 40.0 ± 0.7 | 40.2 ± 0.6 |
| Liver | 28.5 ± 0.1 | 25.0 ± 0.8 | 24.3 ± 0.3 | 24.5 ± 0.3 |
| Lung | 32.1 ± 0.1 | 31.2 ± 1.1 | 29.5 ± 0.3 | 30.4 ± 0.4 |
| Spleen | 25.7 ± 0.3 | 22.8 ± 1.1 | 20.4 ± 0.4 | 19.9 ± 0.6 |
| Kidney | 40.8 ± 0.3 | 39.7 ± 0.4 | 39.7 ± 0.2 | 39.2 ± 0.3 |