Figure 4

Volumes (left y-axis) of delineated CTVs of the participating institutes (small symbols) in comparison to the master CTVs (large symbol and dashed lines). The second symbols on the x-axis indicate mean volumes with standard deviation of the participating institutes (cross and solid lines) and median volumes of the participating institutes (gray symbols). The right y-axis indicates the mean virtual radius of the volumes. From the difference of the mean virtual radius of the institute’s volumes to the dashes lines one can estimate the average distance of the institute’s delineations to the master delineation. (A) CTV66 Gy (circle) (N = 23) and GTV-pt (diamond) (N = 22) Colour of GTV-pt symbols indicates grade (green = acceptable, yellow = borderline, red = unacceptable). (B) CTV52.8 Gy (N = 23). (C) CTV59.4 Gy (N = 22). (D) PTV66 Gy-Exact (N = 23). (E) PTV59.4 Gy-Exact (N = 20). (F) PTV52.8 Gy-Exact (N = 18). Colour of centres (A-W) indicates overall grade.