分次立体定向放射治疗 (fractionat-ed stereotatic radiation tnerapy,FSRT)是近年发展起来的新型放疗技术。其最大优点是可使肿瘤获得比常规放射治疗高得多的剂量 ,而肿瘤周围正常组织的照射剂量显著减少 ,且采用分次照射 ,既符合肿瘤放射生物学规律 ,又发挥了放射物理的优势 Fractionated-stereotactic radiation therapy (fractionat-ed stereotatic radiation tnerapy, FSRT) is a new radiotherapy technology developed in recent years. Its biggest advantage is that the tumor can get a much higher dose than conventional radiotherapy, and the radiation dose of the normal tissue around the tumor is significantly reduced, and the use of fractionated irradiation not only conforms to the law of tumor radiology, but also plays a radiophysical advantage