Table 2.
Dose constraints for breast volumetric modulated arc therapy planning.
| Parameter | 1st Criteria | 2nd Criteria | |
|---|---|---|---|
| Target Volume | PTV (for manual flash plan) V95% | ≥95% | - |
| CTV (for robust optimized plan) V95% | ≥95% | - | |
| PTV (for manual flash plan) V100% | ≥90% | - | |
| CTV (for robust optimized plan) V100% | ≥90% | - | |
| Organs at Risk | Lung (ipsilateral) V500cGy | ≤65% | ≤70% |
| Lung (ipsilateral) V1000cGy | ≤50% | ≤60% | |
| Lung (ipsilateral) V2000cGy | ≤30% | ≤35% | |
| Lung (contralateral) V500cGy | ≤10% | ≤15% | |
| Heart (for left breast cancer) V1500cGy | ≤30% | ≤35% | |
| Heart (for left breast cancer) V2500cGy | ≤5% | - | |
| Heart (for left breast cancer) V3000cGy | - | ≤5% | |
| Heart Dmean | ≤400 cGy | ≤500 cGy |
CTV, clinical target volume; Dmean, average dose received by structure; PTV, planning target volume; V95%/100%, volume of structure receiving more than 95%/100% of prescribed dose, respectively; V500/1000/1500/2000/2500/3000cGy, volume of structure receiving 500/1000/1500/2000/2500/3000 cGy dose, respectively.