4R理论
课程介绍
放射生物学中的“4R”分别指亚致死性损伤修复、细胞周期再分布、再增殖、再氧合，是分割照射的理论基础，当把剂量分成多次可以保护正常组织，因为在照射间隔中正常组织发生了亚致死性损伤修复和再增殖，剂量分割能加重肿瘤损伤，因为发生了细胞周期再分布和再氧合，但过度延长时间会使肿瘤发生再增殖。本次课我们将系统讲解“4R”的机制。
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