Table 1.
Comparisons of the mean dosimetric parameters (across the five cross-validation folds) between the baseline high-resolution anisotropic analytical algorithm (AAA) dose (with a 1 mm grid) and the low-resolution AAA dose (with 3 or 5 mm grids)/predicted high-resolution AAA dose in the planning target volume (PTV), bladder, and rectum.
| ROI | Parameters | AAA | ||||
|---|---|---|---|---|---|---|
| Baseline(1 mm grid) | 3 mm grid | Prediction AAA 3 model | 5 mm grid | Prediction AAA 5 model | ||
| PTV | Mean dose (Gy) | 73.3 (4.0) | 73.0 (4.1) | 73.3 (4.0) | 72.6 (4.1) | 73.3 (4.0) |
| Max. dose (Gy) | 79.7 (3.0) | 77.4 (3.7) | 79.3 (3.4) | 76.2 (4.1) | 78.6 (3.8) | |
| Min. dose (Gy) | 61.4 (5.0) | 61.6 (5.3) | 61.5 (4.9) | 62.0 (5.1) | 62.9 (3.9) | |
| V95% (%) | 98.9 (0.6) | 97.9 (0.9) | 99.0 (0.6) | 93.7 (3.0) | 98.9 (0.6) | |
| CI | 1.08 (0.03) | 1.04 (0.02) | 1.08 (0.03) | 0.97 (0.04) | 1.07 (0.03) | |
| HI | 0.09 (0.01) | 0.10 (0.01) | 0.09 (0.01) | 0.12 (0.02) | 0.09 (0.01) | |
| Bladder | Mean dose (Gy) | 17.1 (11.0) | 17.2 (11.1) | 17.1 (11.0) | 17.4 (11.1) | 17.1 (11.0) |
| Max. dose (Gy) | 78.7 (3.2) | 76.7 (3.8) | 78.1 (3.4) | 75.4 (4.2) | 77.1 (3.6) | |
| Min. dose (Gy) | 1.1 (1.0) | 1.1 (1.0) | 1.0 (1.0) | 1.2 (1.3) | 1.1 (1.1) | |
| V70% (%) | 12.9 (11.6) | 12.9 (11.5) | 12.9 (11.5) | 13.0 (11.5) | 13.1 (11.6) | |
| V50% (%) | 19.4 (15.9) | 19.7 (16.0) | 19.4 (15.9) | 20.0 (16.2) | 19.6 (16.0) | |
| V30% (%) | 27.6 (19.6) | 28.0 (19.7) | 27.6 (19.6) | 28.6 (20.0) | 27.8 (19.6) | |
| Rectum | Mean dose (Gy) | 28.8 (8.5) | 28.7 (8.5) | 28.8 (8.5) | 28.6 (8.4) | 28.7 (8.5) |
| Max. dose (Gy) | 76.5 (3.5) | 75.2 (3.7) | 76.0 (3.6) | 73.9 (3.9) | 75.0 (3.8) | |
| Min. dose (Gy) | 1.0 (0.7) | 1.1 (0.7) | 1.0 (0.6) | 1.2 (0.7) | 1.1 (0.7) | |
| V70% (%) | 15.4 (7.6) | 15.3 (7.5) | 15.4 (7.6) | 15.3 (7.5) | 15.3 (7.6) | |
| V50% (%) | 32.7 (15.1) | 32.4 (15.0) | 32.7 (15.2) | 32.2 (14.6) | 32.6 (15.0) | |
| V30% (%) | 61.6 (16.0) | 61.4 (16.0) | 61.5 (16.0) | 61.2 (16.0) | 61.3 (16.0) | |
The Vn% indicates the percentage of the volume irradiated by n% of the prescription dose. Values expressed in bold are not statistically significant (p-value of >0.05). The standard deviations are indicated in parentheses.
ROI, region of interest; HI, homogeneity index; CI, conformity index; AAA, anisotropic analytical algorithm.