Table 3.
Mean ± SD values of dosimetric parameters and differences between big model versus single-institution model.
| Case I | Case II | |||||
|---|---|---|---|---|---|---|
| Big model | Single-institution model | Difference (p-value) | Big model | Single-institution model | Difference (p-value) | |
| PTV | ||||||
| D98 | 71.2 ± 4.1 | 71.6 ± 4.2 | − 0.3 ± 0.8 (0.588) | 72.1 ± 3.5 | 72.2 ± 3.9 | 0.0 ± 0.8 (0.812) |
| D95 | 72.8 ± 4.2 | 72.9 ± 3.9 | − 0.2 ± 0.6 (0.584) | 74.3 ± 2.8 | 73.6 ± 3.4 | 0.7 ± 1.8 (0.789) |
| D50 | 79.0 ± 1.6 | 78.7 ± 0.5 | 0.3 ± 1.1 (0.416) | 78.9 ± 1.5 | 78.8 ± 0.5 | 0.1 ± 1.2 (1.0) |
| D2 | 81.5 ± 1.8 | 81.6 ± 2.0 | − 0.1 ± 1.5 (0.812) | 81.2 ± 1.7 | 81.3 ± 1.6 | 0.0 ± 1.5 (0.786) |
| HI | 0.13 ± 0.06 | 0.13 ± 0.07 | 0.00 ± 0.03 (1.0) | 0.12 ± 0.05 | 0.12 ± 0.07 | 0.00 ± 0.03 (1.0) |
| Rectum | ||||||
| V90 | 6.6 ± 4.0 | 8.4 ± 3.6 | − 1.8 ± 1.6 (0.0625) | 4.3 ± 2.7 | 6.0 ± 3.4 | − 1.7 ± 1.9 (0.0625) |
| V80 | 12.0 ± 3.9 | 16.8 ± 1.5 | − 4.8 ± 3.7 (0.0625) | 9.3 ± 2.7 | 13.7 ± 1.8 | − 4.3 ± 2.7 (0.0625) |
| V50 | 32.4 ± 3.8 | 46.6 ± 15.4 | − 14.1 ± 13.8 (0.0625) | 30.4 ± 3.9 | 42.5 ± 14.1 | − 12.1 ± 15.2 (0.125) |
| Bladder | ||||||
| V90 | 13.8 ± 1.8 | 13.3 ± 4.3 | 0.5 ± 3.3 (1.0) | 7.2 ± 1.0 | 7.0 ± 2.3 | 0.2 ± 1.9 (1.0) |
| V80 | 19.4 ± 1.6 | 18.7 ± 4.1 | 0.7 ± 3.7 (1.0) | 10.1 ± 0.8 | 10.0 ± 2.0 | 0.2 ± 1.8 (1.0) |
| V50 | 39.9 ± 2.0 | 38.4 ± 5.2 | 1.5 ± 5.6 (0.812) | 21.5 ± 0.9 | 21.2 ± 2.6 | 0.3 ± 3.0 (0.855) |
D98, D95, D50, and D2 Minimum dose in Gy to 2%, 50%, 95%, and 98% of the PTV; HI Homogeneity index; V90, V80, and V50 Volume ratio receiving 90%, 80%, and 50% of the prescribed dose.