Image-guided radiation therapy using magnetic resonance imaging (MRI) is a new technology that has been widely studied and developed in recent years. The technology combines the advantages of MRI imaging, and can offer online real-time tracking of tumor and adjacent organs at risk, as well as real-time optimization of radiotherapy plan. In order to provide a comprehensive understanding of this technology, and to grasp the international development and trends in this field, this paper reviews and summarizes related researches, so as to make the researchers and clinical personnel in this field to understand recent status of this technology, and carry out corresponding researches. This paper summarizes the advantages of MRI and the research progress of MRI linear accelerator (MR-Linac), online guidance, adaptive optimization, and dosimetry-related research. Possible development direction of these technologies in the future is also discussed. It is expected that this review can provide a certain reference value for clinician and related researchers to understand the research progress in the field.
利用磁共振成像（MRI）进行图像引导放射治疗（简称：放疗）是近年来受到广泛关注并取得一定研究进展的新技术。该技术结合了 MRI 成像的优点，具有在线实时追踪肿瘤和临近危及器官以及实时优化放疗计划方案的功能。为了能对该技术的研究有全方位的认识和了解，对国际上在此方面开展的研究进展和动态有所掌握，本文对相关研究进行了综述和概括，以便于让该领域的研究者和医师对此技术的近况有所了解，并展开相应研究。本文就 MRI 的优点、核磁加速器的研究发展、剂量学相关研究进展和在线引导、自适应优化研究进展等方面进行综述，同时也探讨了这些技术今后可能的发展方向，期望本文综述能为临床医生和相关研究人员了解领域内的研究进展提供一定的参考。.
Keywords: adaptive radiation therapy; image-guided radiation therapy; magnetic resonance imaging; magnetic resonance imaging guided radiation therapy; utrecht model.