Table 2.
The dose objectives for PTV and dose constraints for OARs.
| Structures | Parameters | Dose objectives | |
|---|---|---|---|
| PTV1 | |||
| BCS | D95% | ≥50 Gy | |
| MRM | D95% | ≥50 Gy | |
| PTVtb2 | |||
| BCS | D95% | ≥10 Gy | |
| Ipsilateral lung | |||
| V20 Gy | ≤25% ∼ 28% | ||
| V5 Gy | ≤50% ∼ 60% | ||
| MLD3 | ≤15 Gy | ||
| Heart | |||
| Dmean | ≤4 Gy ∼ 8 Gy | ||
| V5 Gy | ≤30% ∼ 40% | ||
| Contralateral lung | |||
| V5 Gy | ≤20% | ||
| Contralateral breast | |||
| V5 Gy | ≤20% | ||
| Thyroid gland | |||
| Dmean | ≤20 Gy | ||
| Spinal cord | |||
| Dmax | ≤20 Gy ∼ 30 Gy | ||
1
BCS, breast-conserving surgery; MRM, modified radical mastectomy; 2tb, tumor bed; 3MLD, mean lung dose.