Figure 1.

An illustration of the (a) planning target volumes: PTV1 (blue‐green), PTV2 (orange), and PTV3 (two light blue‐green sections at top) in the transverse slice, and (b) normal structures delineated using the ${\text{Pinnacle}}^3$ treatment planning system such as mandible (red), oral cavity (blue‐green top), oropharynx (taupe), superior pharyngeal constrictor (blue), left parotid (blue‐green right), brainstem (purple), brain (blue‐gray), and right parotid (violet).