Radiation-induced glymphatic dysfunction in patients with nasopharyngeal carcinoma: a study using diffusion tensor image analysis along the perivascular space oleh Xingyou Zheng, Jianchun Peng, Qing Zhao, Qing Zhao, Li Li, Jian-ming Gao, Keyang Zhou, Bei Tan, Lingling Deng, Youming Zhang, Youming Zhang