Fig. 3

3D views (from Eclipse 15.6) of the geometric-transform-based method to introduce the rotational setup error of − 10° in three directions into an IMRT plan for glioblastoma (a: the reference plan; b: the modified plan). (Setup error of − 10° here is to make the difference of the patient orientations between (a) and (b) obvious and does not mean that it happened in clinical scenes.)