Dosimetric parameters predictive of nasolacrimal duct obstruction after carbon-ion radiotherapy for head and neck carcinoma

Nobuteru Kubo^*, Yoshiki Kubota, Hidemasa Kawamura, Takahiro Oike, Makoto Sakai, Takuya Kumazawa, Yuhei Miyasaka, Shohei Okazaki, Daijiro Kobayashi, Hiro Sato, Tatsuji Mizukami, Atsushi Musha, Katsuyuki Shirai, Jun ichi Saitoh, Satoshi Yokoo, Kazuaki Chikamatsu, Tatsuya Ohno, Takashi Nakano