B Liu1, L Dong1, X Wang2, T Han1, Q Lin3, M Liu1. 1. From the Department of Radiation Oncology, The First Hospital, Jilin University, 71 Xinmin Street, Changchun 130021, China. 2. Department of Otolaryngology, The First Hospital, Jilin University, 71 Xinmin Street, Changchun 130021, China. 3. Department of Nuclear Medicine, The First Hospital, Jilin University, 71 Xinmin Street, Changchun 130021, China.