摘要
目的:测定头颈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(CTV)到计划靶区(PTV)的外扩边界.方法:随机抽取76名头颈部肿瘤患者,在治疗时用电子射野影像装置(EPID)拍摄射野片,将射野片和计划系统中的数字重建射野(DRR)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(-0.62±1.46)mm,(-0.41±1.54)mm,(-0.31±1.67)mm,外扩边界分别是2.27mm,1.87mm,1.98mm.结论:对于头颈部调强治疗的患者,CTV到PTV的外放边界在左右方向需要2.5mm,头脚方向和腹背方向需要2mm.并且随着治疗时间的递进,摆位误差没有规律性的变化.
AIM： To measure the setup error in the intensity modulated radiation therapy （IMRT） for head-neck neoplasms, and to analyze the margin between the clinical target volume （ CTV ） and planning target volume （ PTV ）. METHODS ： Seventy-six patients with head-neck neoplasms were choosed at random. The portal films were screened using the electronic portal imaging device （ EPID）, and the error was analyzed through comparing the portal film with the digitally reconstruced radiographs （DRR） in the treatment planning system （TPS）. RESULTS： The setup errors were （ -0. 62 ± 1.46） mm, （ -0. 41 ± 1.54） mm, （ -0.31 ± 1.67） mm and the margins were 2.27 mm, 1.87 mm, 1.98 mm in lateral, cranial-caudal and ventral-dorsal directions respectively. CONCLUSION： For the patients with headneck neoplasms undergoing the IMRT, the margins between the CTV and the PTV should be 2.5 mm in the lateral direction, and 2 mm in cranial-caudal and ventral-dorsal directions. Moreover, with the treatment time goes by, the error varied irregularly.
出处
《第四军医大学学报》
北大核心
2006年第12期1147-1149,共3页
Journal of the Fourth Military Medical University
基金
江苏省医学重点学科135工程项目
"鼻咽癌调强放射治疗的研究"资助项目(H200140)
关键词
头颈部肿瘤
摆位误差
电子射野影像装置
数字重建图像
head and neck neoplasms
setup error
electronic portal imaging device （ EPID ）
digital reconstructedly radiograph （DRR）
