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