| | | Type I | Type II |
|---|
| | | Fluence (Fig. 5) | 120 segments (Fig. 6a) | 64 segments (Fig. 6a) | Fluence (Fig. 5) |
|---|
| | | A | C | A | C | A | C | B |
|---|
| | | | Min | Max | | | | | Min | Max |
|---|
9-10 beams | a | − | + | ++ | − − | − − | − − | − − | ++ | + |
b | + | + | + | − | − | − | Ο | +(+) | − |
c | Ο | Ο | Ο | Ο | Ο | Ο | Ο | Ο | Ο |
d | ++ | ++ | ++ | Ο | ++ | Ο | ++ | ++ | ++ |
15-16 beams | a | + | + | ++ | Ο | Ο | Ο | Ο | ++ | ++ |
b | ++ | − | +(+) | Ο | Ο | + | + | +(+) | + |
c | Ο | Ο | Ο | Ο | Ο | Ο | Ο | Ο | Ο |
d | + | ++ | + | Ο | Ο | + | + | ++ | ++ |
- Recommendations for the choice of technique, following Figs. 5 and 6, for types of PTV-OAR-topologies (Fig. 1)
- o equivalent, + better, ++ best choice, etc
- Techniques/beam sets:
- a) quasi-isotropic non-coplanar (Q4π)
- b) beams arranged in two orthogonal planes (2P)
- c) coplanar (Co; reference)
- d) coplanar + 1 orthogonal beam (Co + 1)
- “Min” refers to best and “Max” to the most unfavourable orientation of a given beam set (a, b, c, or d), respectively
- (++ in the “Max” column means: the worst result for the considered technique was much better than the most unfavourable result for the reference technique)
