Simultaneous Integrated Boost in Carbon Ion Radiotherapy for Head and Neck Adenoid Cystic Carcinoma

"CIRT Treatment will be delivered in 16 fractions, 4 fractions per week. Treatment plans will be calculated with a Simultaneous Integrated Boost Approach (SIB).~The HR-CTV will receive a total dose of 65.6 GyRBE (4.1 GyRBE/fraction). The LR-CTV will simultaneously receive a total dose of 54.4 GyRBE (3.4 GyRBE/fraction) or 48 GyRBE (3 GyRBE/fraction) at discretion of Radiation Oncologist depending on the prognostic factors (54.4 GyRBE in case of macroscopical perineural invasion or positive margin along the nerve, 48.0 Gy(RBE) in case of elective perineural irradiation or microscopic focal intratumor perineural invasion)."