Structures Optimization objectives Optimization priorities PTV69.96 Gy Maximum dose <69.96 Gy High Minimum dose >69.96 Gy High PTV60 Gy - PTV69.96 Gy Maximum dose <60 Gy Low Minimum dose >60 Gy High PTV54 Gy- PTV69.96 Gy- PTV60 Gy Maximum dose <54 Gy Low Minimum dose >54 Gy High Cord Maximum dose <45 Gy High Brain stem Maximum dose <54 Gy High Lens Maximum dose <5 Gy Medium Inner ear Mean dose <45 Gy Low Oral cavity Mean dose <40 Gy Low Larynx Mean dose <45 Gy Low Mandible Maximum dose <70 Gy Medium

Table 1: The optimization parameter of PTV and OARs for treatment planning. Abbreviations: PTV: Planning Target Volume; OARs: Organs At Risk.