Table 1.
Clinical goals for head and neck planning
| Structure | Dosimetric goal | Dosimetric parameter |
|---|---|---|
| PTV HR | ≥6000 cGy | V95% |
| PTV HR | ≥5550 cGy | V99% |
| PTV HR | 0.75 | Conformity indexa |
| PTV SR | ≥5400 cGy | V95% |
| PTV SR | ≥5022 cGy | V99% |
| PTV SR | 0.75 | Conformity indexa |
| Brainstem + 3 mm | ≥5400 cGy | Dose to 0.1 cc |
| Cochlea + 3 mm (applies to both cochleas) | ≥4500 cGy | Mean dose |
| Cord + 3 mm | ≥5000 cGy | Dose to 0.1 cc |
| Larynx + 3 mm | ≥4100 cGy | Mean dose |
| Larynx + 3 mm | ≥6000 cGy | D24% |
| Normal Tissue (skin minus PTV SR) | ≥5940 cGy | D1% |
| Contralateral Parotid + 3 mm | ≥2600 cGy | Mean dose |
| Contralateral Parotid + 3 mm | ≥3000 cGy | D50% |
| Contralateral Submandibular + 3 mm | ≥3500 cGy | Mean dose |
a
Defined as volume of the associated PTV divided by the volume of the prescription isodose line.