Table 2 Proposed radiation tolerance of organs at risk for reirradiation
Maximum cumulative BED2Gy (RT interval < 2 years) | Maximum cumulative BED2Gy (RT interval ≥ 2 years) | Comment | |
|---|---|---|---|
Brain stem (α/β = 2) | 60 | 78 (≙ + 30%) | Maximum (surface) |
Optic chiasm (α/β = 3) | 54 | 64.8 (≙ + 20%) | Maximum |
Optic nerves (α/β = 3) | 54 | 64.8 (≙ + 20%) | Maximum |
Spinal cord (α/β = 2) | 45 | 54 (≙ + 20%) | Maximum |
Other organs at risk | ALARA* | / | |