宫颈癌后装治疗宫腔内补量照射剂量学研究

The dosimetry research of cervical carcinoma with brachytherapy for complementary intrauterine irradiation

目的:探寻宫颈癌后装治疗宫腔内补量照射方法与剂量学特点。方法:治疗过程划分为宫颈段,全子宫段与宫腔段三部分并做治疗计划,将宫颈段与宫腔段计划融合成为一新的合成计划,然后将合成计划与全子宫段计划反复比较后确定出宫腔段计划(即补量照射计划)。补量照射计划的最后确认用胶片剂量仪。结果:宫腔内补量照射计划与宫颈段计划融合成的合成计划等剂量曲线呈正梨形分布,与宫颈癌的常规治疗计划比较剂量曲线的分布与总驻留时间都非常接近。合成计划等剂量曲线经胶片剂量仪测定呈正梨分布,与宫颈癌的常规治疗计划等剂量曲线基本吻合。结论:宫腔内补量照射最终形成的等剂量曲线呈正梨型分布,能满足宫颈癌后装治疗的剂量学要求。

Purpose:To research the method and dosimetry of dose complementary irradiation with brachytherapy for cervical carcinoma.Method:The process of intracavitary irradiation for cervical carcinoma was devided into three portions of cervix,whole uterus and intrauterus,and treatment plan was done for each portion.Then to make plans of cervical portion and intrauterine portion into a new plan and named it as a fused plan.The intrauterine portion plan(complementary plan)was gotten after comparing the fused plan with whole uterus portion plan repeatedly.Finally the complementary plan was verified by film dosimetry.Result:The dose curve of fused plan was a standing pyriform distribution which was very closed to the routing treatment plan for cervical carcinoma in dose distribution,and its total stay time was quite closed to the routing treatment plan too.Conclusion:The isodose curve of fused plan came into being complementary intrauterine irradiation was a standing pyriform distribution and it could meet the requirement of dosimetry for afterloading of cervical carcinoma.