单双弧体部立体定向放射治疗计划对早期肺癌治疗剂量、效率的预测效果比较  

Comparison of therapeutic dose and efficacy between single arc and double arc stereotactic body radiotherapy for early lung cancer patients

作　　者：张基永[1] 洪丹丽[2] 吴丽丽[1] 陆佳扬[1] 

机构地区：[1]汕头大学医学院附属肿瘤医院,广东汕头515000 [2]汕头大学医学院第一附属医院

出　　处：《山东医药》2016年第39期47-49,共3页Shandong Medical Journal

基　　金：汕头市医疗科技计划项目[2015123号];广东省医学科研基金资助项目(B2016048)

摘　　要：目的比较无均整滤过器模式单、双弧体部立体定向放射治疗计划对早期肺癌的剂量和效率的预测结果。方法选取18例早期肺癌患者,先行胸部CT检查,将CT影像导入Eclipse10.0计划系统,分别设计无均整滤过器模式6 MV X射线双弧体部立体定向放射治疗计划(D-RA)和单弧体部立体定向放射治疗计划(S-RA),处方剂量48 Gy,12 Gy/次,照射4次。比较D-RA、S-RA计划95%的处方剂量覆盖靶区体积的百分数(V95%)、90%的处方剂量覆盖靶区体积的百分数(V90%)、105%的处方剂量覆盖靶区体积的百分数(V105%)、适形指数(CI)、均匀指数(HI)、危机器官(OAR)受照剂量、计划设计时间(PT)、机器跳数(MU)、治疗时间(TT)。结果 D-RA、S-RA的V90%、V95%、V105%间比较,P均>0.05。D-RA、S-RA的CI、TT间比较,P<0.05。D-RA、S-RA各OAR受照剂量比较差异无统计学意义,P均>0.05。D-RA、S-RA的PT、MU间比较P均>0.05。结论无均整滤过器模式DRA、S-RA计划的照射剂量均能覆盖早期肺癌患者的肿瘤靶区,各OAR受照剂量均满足限量要求。D-RA和S-RA计划的靶区覆盖情况及各OAR受照剂量差异较小。D-RA的适形性和均匀性均优于S-RA,S-RA治疗时间短、机器跳数少。Objective To compare the therapeutic dose and efficacy between the single arc and double arc stereotactic body radiotherapy plans for early lung cancer patients with flattening filter free patterns. Methods Eighteen patients with lung cancer of the early stage were selected in this study,and each patient was arranged single arc stereotactic body radiotherapy（ S-RA） and double arc stereotactic body radiotherapy（ D-RA） plans using the Eclipse 10. 0 treatment planning system with 6 MV flattening filter-free（ FFF） photon beams. The prescription dose was 48 Gy,12 Gy/time and for 4times. Comparisons between D-RA and S-RA plans in the target volume received 95% prescription dose（ V95%）,the target volume received 90% prescription dose（ V90%）,the target volume received 105% prescription dose（ V105%）,conformity index（ CI）,homogeneity index（ HI）,organs at risk（ OARs） doses,planning time（ PT）,monitor units（ MU）and treatment time（ TT） were conducted. Results No significant difference was found in V90%,V95%,and V105%;in PT and MU between D-RA and S-RA,all P 0. 05. Significant difference was found in CI and TT between D-RA and SRA,all P 〈0. 05. For the OAR,there was no significant difference between the D-RA and S-RA,P 〉0. 05. Conclusions D-RA and S-RA provids a superior PTV coverage,and all OAR dose meets the constraint level of RTOG 0915 protocol.S-RA shows no significantly difference in PTV coverage and OAR as compared with D-RA. The CI and HI of D-RA are better than those of S-RA. S-RA shows shorter treatment time and less MU number as compared with D-SA.

关 键 词：单弧体部立体定向放射治疗 双弧体部立体定向放射治疗 无均整滤过器模式 肺癌 肺肿瘤 

分 类 号：R734.2[医药卫生—肿瘤]