Table 3.
Comparison of the CI and HI for the targets between SEB-HFWBI and SIB-HFWBI plans in the same position (mean).
| Parameters | SEB-HFWBI | SIB-HFWBI | T-value | P-value |
|---|---|---|---|---|
| Supine | ||||
| PTVSupine-TB | ||||
| CI | 0.48 ± 0.06 | 0.58 ± 0.07 | − 8.114 | 0.000 |
| HI | 0.09 ± 0.01 | 0.10 ± 0.01 | − 6.552 | 0.000 |
| PTVSupine-WB | ||||
| CI | 0.63 ± 0.07 | 0.66 ± 0.06 | − 13.356 | 0.000 |
| PTVSupine-WB-PTVSupine-TB | ||||
| HI | 0.31 ± 0.02 | 0.19 ± 0.02 | 34.467 | 0.000 |
| Prone | ||||
| PTVProne-TB | ||||
| CI | 0.46 ± 0.08 | 0.54 ± 0.09 | − 8.114 | 0.000 |
| HI | 0.09 ± 0.02 | 0.10 ± 0.01 | − 6.552 | 0.000 |
| PTVProne-WB | ||||
| CI | 0.68 ± 0.07 | 0.71 ± 0.07 | − 13.356 | 0.000 |
| PTVProne-WB-PTVProne-TB | ||||
| HI | 0.31 ± 0.02 | 0.21 ± 0.02 | 34.467 | 0.000 |
TB tumor bed, PTVTB planning target volume for the TB, WB whole breast, PTVWB planning target volume for the WB, SIB simultaneous integrated boost, SEB sequential integrated boost, HFWBI hypofractionated whole-breast irradiation, CI conformal index, HI homogeneity index, PTVsupine-WB-PTVsupine-TB the target volume obtained by subtracting the PTVTB from the PTVWB in supine position, PTVprone-WB-PTVprone-TB the target volume obtained by subtracting the PTVTB from the PTVWB in prone position.