放疗与手术、化疗一起,为癌症的三大治疗手段,是癌症治疗中经常用到的方式。放疗利用X线、γ射线或高能电子束等放射线穿透人体组织照射在肿瘤病灶处,由于高能放射线的生物学作用,大量的杀伤、杀死癌细胞,破坏癌组织,使肿瘤缩小,达到治疗肿瘤的目的。利用电子直线加速器,使用不同的射线照射方法,放疗本着提高肿瘤靶区剂量,降低正常组织受量的原则,放疗方法不断更新,从普通 Radiotherapy and surgery, chemotherapy together, for the three major cancer treatment, cancer treatment is often used in the way. Radiotherapy using X-ray, γ-ray or high-energy electron beam and other radiation penetrate the human body tissue irradiation at the tumor lesions, due to the biological role of high-energy radiation, a large number of kill, kill cancer cells, destroy cancer, the tumor shrink, to treatment The purpose of the tumor. The use of electronic linear accelerator, the use of different methods of radiation, radiotherapy in the target dose to improve the tumor target, reduce the normal tissue by the principle of radiotherapy methods continue to update, from the ordinary