Figure 4.

The impact of rotational setup errors on dosimetric verification of 11 VMAT plans using ArcCHECK and ${\text{Delta}}^4$ phantoms in (a) pitch, (b) roll, and (c) yaw directions. The simulated rotational setup errors are 1°, 2°, ‐1°, and ‐2°, respectively. The decreased pass rates of γ analysis, compared to the original results, are assessed with the 3%/3 mm criteria.