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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。
Objective: To explore the method and dose characteristics of uterine cavity replacement therapy after posterior cervical cancer treatment. Methods: The course of treatment was divided into three parts: the cervical segment, the whole uterine segment and the uterine segment, and the treatment plan was made. The cervical segment and the uterine segment were merged into a new synthetic plan, and then the composite plan and the uterine segment plan were repeatedly compared After determining the uterine segment plan (that is, supplementary dose plan). The final confirmation of the supplemental irradiation program uses a film dosimeter. RESULTS: The isodal distribution curve of the compound plan, which was integrated with the cervical intracavitary plan, and the dose distribution curve of the dose curve compared with the routine treatment plan of cervical cancer were very close to the total dwell time. The isodose curve of the synthetic plan showed positive pear distribution as measured by film dosimeter and was basically consistent with the isodose curve of routine treatment plan of cervical cancer. Conclusion: The final islet dose curve of uterine cavity volume supplementation shows a positive pear-shaped distribution, which can meet the dosimetry requirements of post-treatment of cervical cancer.