

Materials and methods: Seventeen patients consecutively treated with UHF-RT on a 1.5-T MR-linac were recruited. Objective: To quantitatively characterize the dosimetric effects of long on-couch time in prostate cancer patients treated with adaptive ultra-hypofractionated radiotherapy (UHF-RT) on 1.5-Tesla magnetic resonance (MR)-linac. 4Department of Urology and State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.3GCP Center/Clinical Research Center, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.2Department of Urology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.1Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.Lin-Rui Gao 1†, Yuan Tian 1†, Ming-Shuai Wang 2†, Wen-Long Xia 1, Shi-Rui Qin 1, Yong-Wen Song 1, Shu-Lian Wang 1, Yu Tang 3, Hui Fang 1, Yuan Tang 1, Shu-Nan Qi 1, Ling-Ling Yan 1, Yue-Ping Liu 1, Hao Jing 1, Bo Chen 1, Nian-Zeng Xing 4*, Ye-Xiong Li 1* and Ning-Ning Lu 1*
