胸部肿瘤调强放疗中摆位误差的原因与控制  

Set-up Error Analysis and Quality Control of Chest Tumor Cases With IMRT

作　　者：上官小玲[1] 张强克[1] 徐建国[1] 

机构地区：[1]浙江省肿瘤医院,浙江杭州310022

出　　处：《中国医学物理学杂志》2011年第4期2716-2717,2732,共3页Chinese Journal of Medical Physics

摘　　要：目的:测定胸部肿瘤在调强放射治疗中的摆位偏差,分析计划设计中从临床靶区到计划靶区的外扩边界。方法:随机抽取115名胸部肿瘤患者,在治疗时用电子射野影像装置拍摄射野片,将射野片和计划系统中的数字重建射野图像片进行误差比较。结果:在左右、头脚、腹背方向的摆位误差分别是(-0.46±0.24)cm,(-0.37±0.08)cm,(-0.42±0.19)cm,外扩边界分别是0.7 cm,0.45 cm,0.61 cm。结论:对于胸部调强放疗的患者,CTV到PTV的外放边界在左右方向需要2.5 mm,头脚方向和腹背方向需要2 mm。Objective: To measure set-up error of chest cases in intensity modulated radiation therapy(IMRT).The results can be used to determine the margin from clinical target volume(CTV) to planning target volume(PTV) in treatment planning.Methods: 115 chest tumor cases were randomly chosen,each of them was checked with electronic portal imaging device(EPID).These images were compared with digital reconstructed radiography(DRR) which were generated from treatment planning system.Results: The set-up error in left-right,superior-inferior,anterior-posterior was(-0.46±0.24)cm,(-0.37±0.08)cm,(-0.42±0.19)cm,separately.And the margin in these three directions should be 0.7 cm,0.45cm,0.61cm.Conclusions: For chest cases in radiotherapy,the margin from CTV to PTV should be 2.5 mm in left-right direction and 2mm in both superior-inferior and anterior-posterior directions.

关 键 词：胸部肿瘤 摆位误差 电子射野影像装置 数字重建图像 

分 类 号：R312[医药卫生—基础医学]