3．照射方式：同等剂量照射，一次照射(single dose)比分次照射(fractionated dose)效应强；同样，全身照射比局部照射效应强。 （二）机体因素 1．种系差异：一般说，生物进化程度愈高，辐射敏感性愈高。
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fractionated dose schedule 分次照射时间表
partial fractionated dose sequence 分割剂量排列顺序
fractionated high dose 分次大剂量
dose fractionated 剂量分次
Radiotherapy dose fractionated 放射剂量分割
Low-dose continuously fractionated X-rays irradiation X射线多次辐射
Objective To study the effect of post mastectomy radiotherapy with different fractionated dose schemes for early breast cancer.
目的探讨早期乳腺癌根治术后或改良根治术后不同剂量分割放射方案的疗效。
Objective To evaluate the clinical effects of low dose fractionated irradiation on spleen combined with radiotherapy in patients with esophageal cancer.
目的分析低剂量分次照射脾脏联合放射治疗食管癌的临床疗效和失败原因。
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