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ID:17489019
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时间:2018-09-02
《非小细胞肺癌不同放射治疗计划的剂量学研究.doc》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、非小细胞肺癌不同放射治疗计划的剂量学研究【摘要】目的研究比较非小细胞肺癌(NSCLC)不同照射方法的优劣。方法应用Topslane三维治疗计划系统,对经病理证实的30例NSCLC患者均设计四种放射治疗计划:常规放疗、常规加三维适形放疗、三维适形选择性淋巴结照射(ENI)和三维适形累及野照射(IFI)。各计划总放疗剂量均为66Gy。通过剂量体积直方图(DVH)、靶区适形指数(CI)、肿瘤控制概率(TCP)正常组织并发症概率(NTCP)评价各治疗计划效果。结果常规放疗、常规加适形放疗、ENI和IFI的CI分别为0.09、0.15、0.21、0.27;TCP分别为94.7%、96.9%、97
2、.1%、97.5%;全肺接受≥20Gy照射体积百分比(V20)分别为25.7%、25.1%、23.6%、21.8%;NTCP分别为7.8%、7.9%、6.8%、5.6%;食管接受≥45Gy照射体积百分比(V45)分别为31.3%、31.0%、23.2%、19.7%;心脏受照射平均剂量分别为25.7Gy、24.7Gy、15.1Gy、14.3Gy;脊髓受照射的最大剂量分别为42.6Gy、42.1Gy、39.4Gy、38.4Gy。结论三维适形放射治疗较常规放射治疗提高了靶区的照射剂量和肿瘤控制概率,可降低正常组织受照剂量和正常组织并发症的概率。【关键词】非小细胞肺癌;放射疗法;适形;剂量体积
3、直方图 Abstract:ObjectiveUsingthreedimensionaltreatmentplanningsystem,toassessthedosimetricofdifferentradiationtherapyplanningandtoobtainabettertechniqueinthetreatmentofnon-smallcelllungcancer.MethodsUsingtheTopslanetreatmentplanningsystem,thirtypathologicallyprovedpatientsofnon-smallcelllungcance
4、rwereselectedinthisstudy.Fourdifferentmethodsofradiotherapyplanningwereusedforeachcase,whichwereconventionalradiation,conventionalplusconformalradiation,electivenodalirradiation(ENI)andinvolved-fieldirradiation(IFI).Thetotalradiationdosewas66Gy.Dosevolumehistogram(DVH),nomaltissuecomplicationpro
5、bability(NTCP),tumorcontrolprobability(TCP)andconformityindex(CI)wereusedtoassessthetargetvolumedosimetricdistributionandNTCP.ResultsTCPofconventionalradiation,conventionalplusconformalradiation,ENIandIFIgroupswere94.7%,96.9%,97.1%,97.5%;CIwere0.09,0.15,0.21,0.27,respectively;thetotallungvolumer
6、eceivedradiation20Gy(V20)were25.7%,25.1%,23.6%,21.8%;NTCPwere7.8%,7.9%,6.8%,5.6%,respectively.Thetotalesophagealvolumereceivedradiation45Gy(V45)were31.3%,31.0%,23.2%,19.7%.Themeandoseattheheartwere25.7Gy,24.7Gy,15.1Gy,14.3Gy.Themaximumdoseatthespinalcordwere42.6Gy,42.1Gy,39.4Gy,38.4Gy.Conclusion
7、Comparedwiththeconventionalradiotherapy,3DCRTincreasesthedoseattargetandTCP,anddecreasesthedoseatthenormaltissue、NTCP.IFIcanprotectnormaltissueeffectively,whichmakeitpossipletoincreasethedoseat5targetandTCP.IFIshouldbehelpfu
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