一概论放射治疗是当前治疗肿瘤的重要手段之一。放射治疗的原则在于尽可能多地破坏肿瘤组织和尽可能少地损伤正常组织。因此,要提高放射治疗的疗效,必须考虑到两个方面:即在不增高正常组织损伤的前提下。提高破坏肿瘤的程度,或在不减弱对肿瘤破坏的前提下减轻正常组织的损伤程度。这就是提高治疗比率(肿瘤致死效应与组织损伤效 An overview of radiation therapy is one of the most important means for the treatment of cancer. The principle of radiation therapy is to destroy the tumor tissue as much as possible and damage normal tissue as little as possible. Therefore, to improve the efficacy of radiation therapy, we must consider two aspects: that is, without increasing the damage of normal tissue. Increase the degree of destruction of the tumor, or reduce the extent of normal tissue damage without weakening the damage to the tumor. This is to increase the treatment rate (tumor lethal effect and tissue damage effect