Table 4. Mean ± SD values of conventional 2D and dose-volume parameters by type of surgery and treatment technique .
| Variable | BCS | MRM | 2FRT | 3FRT |
| 2D parameters | ||||
| CLD (cm) | 2.8 ± 0.7 | 3.3 ± 0.5 | 2.9 ± 0.6 | 3.1 ± 0.6 |
| MLD (cm) | 3.0 ± 0.6 | 3.3 ± 0.5 | 3.1 ± 0.5 | 3.2 ± 0.6 |
| MHL (cm) | 7.3 ± 1.8 | 8.0 ± 1.4 | 7.8 ± 1.6 | 7.6 ± 1.7 |
| MHD (cm) | 2.4 ± 0.9 | 2.5 ± 0.5 | 2.3 ± 0.6 | 2.5 ± 0.8 |
| CWS (cm) | - | - | 23.1 ± 2.5 | 21.9 ± 3.3 |
| Dose-volume parameters for ipsilateral lung | ||||
| V5Gy (%) | 39.2 ± 8.6 | 40.5 ± 8.6 | 32.0 ± 5.5 | 43.8 ± 7.0 |
| V10Gy (%) | 27.3 ± 6.9 | 29.9 ± 6.7 | 23.7 ± 4.1 | 31.0 ± 6.7 |
| V20Gy (%) | 21.1 ± 6.0 | 23.8 ± 5.6 | 18.7 ± 3.7 | 24.3 ± 6.0 |
| Dmean (Gy) | 23.0 ± 6.4 | 24.6 ± 5.7 | 20.8 ± 5.8 | 25.3 ± 5.7 |
| Dose-volume parameters for heart | ||||
| V5Gy (%) | 18.0 ± 7.1 | 20.1 ± 6.7 | 18.7 ± 7.0 | 19.3 ± 7.0 |
| V10Gy (%) | 12.5 ± 6.0 | 15.2 ± 5.4 | 13.3 ± 5.8 | 14.1 ± 5.9 |
| V20Gy (%) | 10.1 ± 6.5 | 12.0 ± 4.7 | 10.3 ± 5.4 | 11.5 ± 5.9 |
| V25Gy (%) | 8.3 ± 5.5 | 10.8 ± 4.6 | 9.0 ± 5.3 | 9.8 ± 5.1 |
| Dmean (Gy) | 11.7 ± 5.0 | 13.7 ± 4.6 | 12.3 ± 4.9 | 12.9 ± 4.9 |
| Maximum dose of breast (%) | - | - | 108.5 ± 2.9 | 108.5 ± 2.6 |
2D: Two-dimensional; CLD: Central lung depth; MLD: Maximum lung depth; MHL: Maximum heart length; MHD: Maximum heart distance; CWS: Chest wall separation; Vx: Volume of lung or heart receiving xGy; Dmean: Mean dose; BCS: Breast-conserving surgery; MRM: Modified radical mastectomy; 2FRT: Two-field radiotherapy; 3FRT: Three-field radiotherapy