宫颈癌调强适形放疗中有孔泡沫板两种摆放位置对小肠受照射体积的影响研究

Effect of Two Kinds of Location on the Exposure Volume of Small Intestine in Cervical Cancer

目的：比较宫颈癌调强适形放疗中有孔泡沫板两种摆放位置对小肠受照射体积的影响。方法收集10例宫颈癌术后放疗患者，比较两种摆放位置计划中小肠受照的最高剂量和平均剂量，以及在10%～100%的处方剂量内以10%为剂量梯度来评价小肠的受照体积。结果两种体位下分别勾画的CTV、PTV总体积无差别，但在Location II小肠的体积小于Location I（P＜0.05）。结论宫颈癌手术后患者应用有孔泡沫板孔的下缘置于骶髂关节下缘（Location II）的体位，均可显著降低小肠的受照射总体积、各剂量水平下小肠受照体积及小肠受照平均剂量。

Objective To compare the effect of two kinds of placing position of the oriifce plate in the treatment of cervical carcinoma in the treatment of small intestine and the size of the small intestine. Methods 10 cases of cervical cancer patients treated with radiotherapy were collected, and the maximum dose and average dose of the small intestine were compared between two kinds of placement plan, and the dose gradient was 10%in the prescription dose of 10%~100%. Results there was no difference between CTV and PTV, but the volume of Location II was less than that of I Location （P〈0.05）. Conclusion In the patients with cervical cancer, the Location II can be used to reduce the total volume of the small intestine, and the average dose of small intestine by the exposure of the small intestine.