| 段文越,吴华健,赵耿昊,等.伽马刀SBRT与直线加速器SBRT治疗肺部肿瘤的剂量学对比研究[J].中华放射医学与防护杂志,2024,44(6):482-488.Duan Wenyue,Wu Huajian,Zhao Genghao,et al.Dosimetric comparison between gamma knife SBRT and linear accelerator-based SBRT for lung tumors[J].Chin J Radiol Med Prot,2024,44(6):482-488 |
| 伽马刀SBRT与直线加速器SBRT治疗肺部肿瘤的剂量学对比研究 |
| Dosimetric comparison between gamma knife SBRT and linear accelerator-based SBRT for lung tumors |
| 投稿时间：2023-08-06 |
| DOI：10.3760/cma.j.cn112271-20230806-00033 |
| 中文关键词: 立体定向放射治疗 伽马刀 肺部肿瘤 剂量分布 |
| 英文关键词:Stereotactic body radiation therapy Gamma knife Lung tumors Dose distribution |
| 基金项目:辽宁省科学技术计划项目(2021JH1/10400051);大连市高端人才项目(2021RD02);国家重点研发计划(2022YFC2407104) |
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| 中文摘要: |
| 目的 比较分析伽马刀立体定向放射治疗(SBRT)与基于直线加速器的X射线SBRT治疗肺部肿瘤的剂量学差异,为治疗策略的选择提供理论依据。方法 选取2022年1月至2023年5月在大连大学附属中山医院肿瘤中心接受肺部SBRT的患者7位,针对其13个病灶,分别设计伽马刀SBR T(γ_SBRT)计划与加速器SBRT(X_SBRT)计划,将同一患者位置邻近的病灶设计在同一计划中,得到γ_SBRT与X_SBRT计划各10个,处方剂量为30~50 Gy/5~10次。比较分析两种计划的剂量参数,包括:计划靶区(PTV)的靶区覆盖率,梯度指数(GI),适形指数(CI),最大剂量(Dmax),平均剂量(Dmean),最小剂量(Dmin);20 Gy(V20)、10 Gy(V10)、5 Gy(V5)剂量线包绕的体积,100%处方剂量(V100%)、50%处方剂量(V50%)剂量线包绕的体积;患侧肺Dmean、20 Gy剂量线包绕的肺体积占该侧肺体积的百分比(Lung_V20)、5 Gy剂量线包绕的肺体积占该侧肺体积的百分比(Lung_V5),健侧肺Dmean、Lung_V5,食管、脊髓以及心脏的Dmax。结果 γ_SBRT计划在GI,V20、V10、V5、V50%,患侧肺Dmean、Lung_V20、Lung_V5,健侧肺Dmean、Lung_V5,以及食管和心脏Dmax方面均优于X_SBRT计划(z=-2.81~-1.99,P＜0.05)。γ_SBRT计划中,PTV的Dmax以及Dmean高于X_SBRT计划(z=-2.80、-2.80,P<0.05);靶区覆盖率、CI、脊髓Dmax在二者间差异无统计学意义(P＞0.05);γ_SBRT计划的治疗时间长于X_SBRT计划(z=-2.70,P＜0.05)。结论 伽马刀SBRT计划在靶区外剂量跌落方面优于加速器SBRT计划,在肺部肿瘤治疗中有望减少靶区周围低剂量区以及正常肺组织受照剂量,但治疗时间显著增加。 |
| 英文摘要: |
| Objective To analyze the dosimetric differences between gamma knife stereotactic body radiation therapy (SBRT) and linear accelerator-based SBRT for lung tumors by comparison to provide a theoretical basis for the selection of treatment strategies. Methods Seven patients who underwent SBRT for lung tumors in the Cancer Center of Affiliated Zhongshan Hospital of Dalian University from January 2022 to May 2023 were enrolled. Plans of gamma knife SBRT (γ_SBRT) or linear accelerator-based SBRT plans (X_SBRT) were designed for the 13 lesions in the patients, with adjacent lesions in the same patient sharing one plan. As a result, 10 γ_SBRT plans and 10 X_SBRT plans were obtained. All lesions received 30-50 Gy of radiation in 5-10 fractions. Then, dosimetric parameters were analyzed and compared between γ_SBRT and X_SBRT plans, including the target coverage, gradient index (GI), conformity index (CI), maximum dose (Dmax); mean dose (Dmean), and minimum dose (Dmin) of planning target volumes (PTVs); lung volumes receiving 20 Gy or more (V20), 10 Gy or more (V10), 5 Gy or more (V5), 100% of the prescription dose (V100%), and 50% of the prescription dose (V50%); Dmean and the percentages of lung volume receiving doses of 20 Gy or more (Lung_V20) and 5 Gy or more (Lung_V5) of ipsilateral lung; Dmean and Lung_V5 of contralateral lung; and Dmax values of the esophagus, spinal cord, and heart. Results Compared to X_SBRT plans, γ_SBRT plans exhibited superior GI, V20, V10, V5, V50%, the Dmean, Lung_V20, and Lung_V5 of ipsilateral lung, the Dmean and Lung_V5 of the contralateral lung, and the Dmax of esophageal and heart (z = -2. 81 to -1. 99, P＞0. 05), higher Dmax and Dmean of PTVs (z = -2. 80, -2. 80, P＞0. 05), and longer delivery time (z=-2. 70, P<0. 05). Meanwhile, there was no significant difference in target coverage, CI, and Dmax of the spinal cord (P＞0. 05). Conclusions Gamma knife SBRT plans can achieve sharper dose falloff outside target volumes than linear accelerator-based SBRT plans. Gamma knife radiosurgery is expected to reduce the radiation dose to low-dose areas around PTVs and normal lung tissue in SBRT for lung tumors. However, it significantly prolongs the delivery time. |
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