MR-based synthetic CT image for intensity-modulated proton treatment planning of nasopharyngeal carcinoma patients. - Chen, Shupeng; Peng, Yinglin; Qin, An; Liu, Yimei; Zhao, Chong; Deng, Xiaowu; Deraniyagala, Rohan; Stevens, Craig; Ding, Xuanfeng (Acta Oncologica, 2022)