Skip to main content

Advertisement

Table 2 Comparison of non-coplanar techniques to the reference coplanar technique

From: Characteristics of non-coplanar IMRT in the presence of target-embedded organs at risk

   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 + + ++ ++
  1. Recommendations for the choice of technique, following Figs. 5 and 6, for types of PTV-OAR-topologies (Fig. 1)
  2. o equivalent, + better, ++ best choice, etc
  3. Techniques/beam sets:
  4. a) quasi-isotropic non-coplanar (Q4π)
  5. b) beams arranged in two orthogonal planes (2P)
  6. c) coplanar (Co; reference)
  7. d) coplanar + 1 orthogonal beam (Co + 1)
  8. “Min” refers to best and “Max” to the most unfavourable orientation of a given beam set (a, b, c, or d), respectively
  9. (++ in the “Max” column means: the worst result for the considered technique was much better than the most unfavourable result for the reference technique)