| Dose limitations (Gy) | ||||||
---|---|---|---|---|---|---|---|
PTV margin to 1st shell | 1st shell to 2nd shell | 2nd shell to 3th shell | 3th shell to 4th shell | 4th shell to 5th shell | 5th shell to 6th shell | 6th shell to 7th shell | |
3-shell group | 26 | 17 | 9 | – | – | – | – |
5-shell group | 32 | 26 | 17 | 9 | 6 | – | – |
7-shell group | 32 | 26 | 21 | 17 | 9 | 6 | 5 |