关键词: 放射性脑病, 诊断, 影像学, 头颈部恶性肿瘤

Abstract: ［Abstract］ Radiotherapy is the most commonly used treatment for head and neck malignant tumors， especially nasopharyngeal cancer. In recent years， due to the improvement of radiotherapy technology， the incidence of complications after radiotherapy has decreased significantly， but it still can not be completely avoided. Radiation encephalopathy caused by radiotherapy has a far greater impact on the quality of life of patients than the tumor itself， and patients pay more and more attention to the quality of their life， so radiation encephalopathy is increasingly concerned， seeking for early detection， diagnosis and treatment. The diagnosis of radiation encephalopathy mainly depends on clinical manifestations and imaging examinations. This paper will review the pathogenesis and imaging diagnosis methods of radiation encephalopathy， including CT， MRI and molecular imaging techniques.

Key words: radiation encephalopathy, diagnosis, imaging, head and neck malignant tumor