Table 6.
Dosimetric evaluation of the targets for the SEB-HFWBI or SIB-HFWBI treatment plan in the supine and prone positions (median).
| Parameters | Supine | Prone | Z-value | P-value |
|---|---|---|---|---|
| SEB-HFWBI | ||||
| PTVTB | ||||
| Dmean (Gy) | 53.11 (51.78–54.79) | 53.57 (51.42–54.24) | − 2.478 | 0.013 |
| V100% | 99.35 (95.80–99.97) | 99.30 (92.00–99.90) | − 0.577 | 0.564 |
| PTVWB | ||||
| V100% | 98.10 (96.40–99.60) | 98.30 (86.50–100.00) | − 0.748 | 0.455 |
| CI | 0.63 (0.47–0.75) | 0.69 (0.50–0.82) | − 3.340 | 0.001 |
| PTVWB-PTVTB | ||||
| V100% | 12.65 (4.00–25.70) | 20.4 (5.20–32.40) | − 3.908 | 0.000 |
| SIB-HFWBI | ||||
| PTVTB | ||||
| Dmean (Gy) | 51.04(49.77–52.66) | 51.95 (50.13–57.98) | − 2.036 | 0.021 |
| V100% | 98.55 (95.50–99.80) | 98.40 (93.70–99.90) | − 0.068 | 0.946 |
| PTVWB | ||||
| V100% | 96.55 (86.30–98.50) | 96.55 (95.10–98.40) | − 0.216 | 0.829 |
| CI | 0.66 (0.50–0.77) | 0.72 (0.52–0.83) | − 3.501 | 0.000 |
| PTVWB-PTVTB | ||||
| V100% | 8.60 (2.60–14.70) | 13.55 (3.80–36.20) | − 4.165 | 0.000 |
TB tumor bed, PTVTB planning target volume for TB, WB whole breast, PTVWB planning target volume for WB, PTVWB-PTVTB the target volume obtained by subtracting the PTVTB from the PTVWB, SIB simultaneous integrated boost, SEB sequential integrated boost, HFWBI hypofractionated whole-breast irradiation, CI conformal index, Dmean mean dose, V100% the PTV coverage percent of the 100% prescribed dose line including PTVTB, PTVWB, PTVWB-PTVTB in the treatment plan under supine and prone positions.