Up to present, radiotherapy has been focused on external beam radiation, and externally applied radiation is prejudicial for sensitive components from normal cells.
目前,临床肿瘤放射治疗主要采用外照射放射治疗,但其会在射线杀伤肿瘤细胞的同时损伤周围正常细胞。
参考来源 - ~（18）氟—氟代脱氧葡萄糖诱导Lewis肺癌细胞凋亡的实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Radiation focused from a source outside the body is called external beam radiation.
射线聚焦来自体外称作外射线术的放射源。
Out of the group that chose radiation, approximately 30% had external beam radiation and 20% had implanted seeds.
而在其它选择放射治疗患者人群中，大约有30%使用外源性辐射治疗，20%使用植入式放射源治疗。
The combination of external beam irradiation with brachytherapy may decrease the dose of external irradiation, so the late radiation complication may be reduced.
采用外照射与腔内近距离放射治疗可以降低外照射剂量，减轻部分放射并发症。
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