微信公众号

官网二维码

中国癌症防治杂志 ›› 2012, Vol. 4 ›› Issue (1): 53-56.doi: 10.3969/j.issn.1674-5671.2012.01.13

• 临床研究 • 上一篇    下一篇

非小细胞肺癌自适应放疗剂量学研究

  

  1. 广西医科大学附属肿瘤医院放疗科;广西医科大学研究生学院
  • 出版日期:2012-03-25 发布日期:2012-04-16
  • 通讯作者: 陈龙 E-mail:chenlong810@yahoo.com.cn
  • 基金资助:

    广西自然科学基金资助项目(2011jjA40272;桂科基0448065)

Dosimetry study of adaptive radiotherapy in non-small cell lung cancer

  • Online:2012-03-25 Published:2012-04-16

摘要: 目的 在非小细胞肺癌中,评估及比较大分割三维适形放疗计划(CT-3DCRT)及应用CBCT图像设计自适应放疗计划(CBCT-ART)在剂量学上的变化,为临床选择最佳治疗策略提供依据。方法 对我院2010年6月至2011年10月收治的10例应用大分割3DCRT的非小细胞肺癌患者,每次放疗前进行一次CBCT验证,并应用CBCT图像设计与治疗前(CT-3DCRT)相似的CBCT-ART计划,通过剂量体积直方图评价二者对靶区及正常组织受照剂量的影响。结果 在CBCT-ART计划中,患侧肺V20为(9.5±3.45)%,脊髓Dmax为(25±12.7)Gy,而在CT-3DCRT计划中分别为(11.5±3.5)%、(27±13.2)Gy,自适应放疗计划较三维适形放疗计划可明显降低正常组织受量(P<0.05)。结论 根据分次CBCT图像所示靶区变化进行再计划,可以明显减少周围正常组织器官受量,从而可进一步提高靶区剂量,提高局部控制率。  

关键词: 锥形束CT, 自适应放射治疗, 三维适形放疗

Abstract: Objective To evaluate and compare the dosimetry achieved using three-dimensional conformal radiotherapy(CT-3DCRT) with that achieved using cone-beam computer tomography adaptive radiotherapy(CBCT-ART) in patients with non-small cell lung cancer,in order to provide a basis for selecting the best clinical treatment strategy.Methods Ten patients with non-small cell lung cancer were treated in our hospital between June 2010 and October 2011,first using hypofractionated CT-3DCRT,with CBCT verifi-cation performed before each fraction,and then using CBCT-ART. Dosimetry of target and normal tissue was compared between the two CT approaches using dose-volume histograms.Results In the CBCT-ART approach,V20 of the affected side of the lung was(9.5±3.45)% and the Dmax of the spinal cord was (25±12.7) Gy,while the corresponding values in the CT-3DCRT approach were(11.5±3.5)% and(27±13.2) Gy(P<0.05). Adaptive radiotherapy can significantly reduce the radiation exposure of normal tissue compared with three-dimensional conformal radiotherapy.Conclusion Using target volume changes in each CBCT image to adjust the dosing regime can significantly reduce the radiation exposure of adjacent normal tissue,which may allow use of a higher target dose and sub-sequent improvement in local control.

Key words: Conebeam CT, Adaptive radiotherapy, Three-dimensional conformal radiotherapy