近距离放射治疗也称腔内和组织间放射治疗（内照射、后装治疗），远距离放射治疗即放射源置于体外的放射治疗（外照射）。由于近距离治疗技术的发展，近距离与远距离配合使用治疗肿瘤越来越受到重视。近距离治疗仅是远距离治疗的补充手段，使用的机会相对较少。考虑经济、放射 Brachytherapy is also known as intracavitary and inter-organizational radiotherapy (internal irradiation, afterloading treatment), long-distance radiotherapy is the radioactive source placed in vitro radiotherapy (external irradiation). Due to the development of brachytherapy, more and more attention has been paid to the treatment of tumors with close distance and long distance. Brachytherapy is only a supplement to tele-treatment, with fewer opportunities for use. Consider the economy, radiation