金属内支架与食管癌IMRT靶区和危及器官剂量分布关系

Dose distribution relationship between metallic esophageal stent and target and organs at risk with IMRT of esophageal carcinoma

目的分析金属内支架与食管癌调强放射治疗(IMRT)靶区及危及器官剂量分布关系。方法 6例食管癌患者分为支架组和非支架组,行增强模拟定位CT扫描,在TPS计划系统勾画靶区和危及器官,设置7野IMRT计划。放射线为6MV-x线。结果适型指数(CI)和均匀性指数(HI)、靶区和危及器官剂量支架组与非支架组间无明显差异(P>0.05)。结论食管内支架采用IMRT技术,可获得无支架的剂量分布。

Objective To evaluate the dose distribution relationship between metallic esophageal stent and target and organ at risk（OAR）with Intensity Modulation Radiated Therapy（IMRT）of esophageal carcinoma.Methods 6 patients were divided into stent and nonstent group and treated with enhanced simulation CT scan,described target and OAR and designed 7 fields-radiation plan.The energy of radioactive ray was 6 MV-x-ray.Results There was no significant difference for target conformity index（CI）and homogeneity index（HI）,target and OAR volume dose for stent and nonstent group（P〉0.05）.Conclusion It can gain the similar dose distribution with non-stent to use IMRT technique for metallic esophageal stent.