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中华临床医师杂志(电子版) ›› 2017, Vol. 11 ›› Issue (21) : 2349 -2356. doi: 10.3877/cma.j.issn.1674-0785.2017.21.001

所属专题: 文献

临床论著

颈段和胸上段食管癌调强放射治疗计划的参数优化及模板建立
陈利1, 柳弥2,(), 李贤富1, 田维科2, 赵小庆3   
  1. 1. 637100 四川南充,川北医学院附属医院肿瘤科
    2. 637100 四川南充,川北医学院附属医院健康管理中心
    3. 637100 四川南充,川北医学院
  • 收稿日期:2017-03-23 出版日期:2017-11-01
  • 通信作者: 柳弥

Parameter optimization of intensity-modulated radiotherapy plan in cervical and upper thoracic esophageal cancer

Li Chen1, Mi Liu2,(), Xianfu Li1, Weike Tian2, Xiaoqing Zhao3   

  1. 1. Department of Oncology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637100, China
    2. Health Management Center, Affiliated Hospital of North Sichuan Medical College, Nanchong 637100, China
    3. North Sichuan Medical College, Nanchong 637100, China
  • Received:2017-03-23 Published:2017-11-01
  • Corresponding author: Mi Liu
  • About author:
    Corresponding author: Liu Mi, Email:
引用本文:

陈利, 柳弥, 李贤富, 田维科, 赵小庆. 颈段和胸上段食管癌调强放射治疗计划的参数优化及模板建立[J]. 中华临床医师杂志(电子版), 2017, 11(21): 2349-2356.

Li Chen, Mi Liu, Xianfu Li, Weike Tian, Xiaoqing Zhao. Parameter optimization of intensity-modulated radiotherapy plan in cervical and upper thoracic esophageal cancer[J]. Chinese Journal of Clinicians(Electronic Edition), 2017, 11(21): 2349-2356.

目的

探讨基于Monaco计划系统时颈段、胸上段食管癌予调强放射治疗(IMRT)的最佳优化模板。

方法

根据制定的标准选择2012年10月至2014年10月到川北医学院附属医院放疗科行放射治疗的11例患者,所有入组患者在规定条件下行CT模拟定位,修改、确认靶区后由物理师制作射野数目不同的IMRT计划,将不同计划肿瘤靶区、危及器官及正常组织相关评估参数进行统计并比较分析,从而得到更优的放疗计划。

结果

(1)PTV1体积参数中V95%(%)3野计划明显低于其他放疗计划(P<0.05)。(2)PTV2中各评估参数在各组调强计划中差异无统计学意义(P>0.05)。(3)危及器官中甲状腺、气管及脊髓在不同计划中未见明显区别。(4)肺V10、V20及V30 3野计划受照体积较其他放射野大(P<0.05)。(5)各放疗计划相比,9野计划的治疗时间最长,治疗效率最低(P<0.05)。(6)Patient中V20、V30、V40及V50照射时3野计划高于其他各组放疗计划(P<0.05),而其余参数无明显差异(P>0.05)。

结论

应用医科达Monaco 3.2调强计划系统,放疗计划子野参数限制条件为最小射野面积为4.000 cm2,最小变化面积3.000 cm2,叶片端面最小宽度为0.60 cm,最小跳数为6 MU,在颈段和胸上段食管癌IMRT中,5野及7野计划比较合适。

Objective

To optimize the parameters of Monaco planning system based intensity-modulated radiotherapy (IMRT) plan for cervical and upper thoracic esophageal cancer.

Methods

Eleven esophageal cancer patients treated at the Radiotherapy Department of Affiliated Hospital of North Sichuan Medical College were selected and included in this study. Under specified conditions, all the patients underwent CT simulation. The physicists set the optimization parameters, changed the number of radiation fields to establish different IMRT plans, and analyzed the data on tumor target volume, organs at risk, and normal tissue of different plans to obtain the optimal radiotherapy plan.

Results

The three-field radiotherapy plan had significantly lower V95% (a PTV1 volume parameter) than the other radiotherapy plans (P<0.05). The volume parameters and dose parameters of PTV2 in each IMRT plan had no significant difference (P>0.05). The thyroid gland, trachea, and spinal cord in different irradiation field plans had no significant difference in risk. The irradiated volume of the lungs was the largest in the V10, V20, and V30 three-field plan, and smaller in the five-, seven-, and nine-field plans (P<0.05). Among the IMRT plans, the nine-field plan had the longest therapy time and the poorest therapeutic effect (P>0.05). The undefined normal tissue was larger in the V20, V30, V40, and V50 three-field plan than in the other plans (P<0.05), and there was no significant difference between the plan at V5, V10, and V60, (P>0.05).

Conclusion

Using the Elekta Monaco 3.2 IMRT radiotherapy planning system and selecting the size of 4.000 cm2 as the minimum field, the area of 3.000 cm2 as the minimum change, 0.60 cm as the minimum width of leaf, and 6 MU as the minimum hop number, the five-field and seven-field plans are more suitable than the others in cervical and upper thoracic esophageal cancer.

表1 11例食管鳞癌基本资料
表2 不同照射野PTV1各参数比较(±s
表3 不同照射野PTV2各参数比较(±s
图1 甲状腺剂量体积直方图
表4 不同照射野各危及器官比较(±s
图2 脊髓剂量体积直方图
图3 不同照射野肺比较
图4 肺剂量体积直方图
图5 不同照射野肺的平均剂量比较
图6 不同照射野子野数比较
图7 不同照射野总机器跳数比较
表5 不同照射野未定义正常组织比较(%,±s
图8 不同照射野未定义正常组织比较
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