射波刀金标追踪仰卧位与俯卧位治疗照射精度的对比  

Comparison of the radiation precision of metal marker tracing of Cyberknife between supine and prone position treatment

作　　者：丁俊强 朴俊杰 徐慧军 孙静 王佳 王东方 段学章 

机构地区：[1]解放军总医院第五医学中心肿瘤放射治疗中心,北京100071

出　　处：《中国医学装备》2019年第1期36-39,共4页China Medical Equipment

基　　金：首都特色基金(Z151100004015002)"首都特色-原发性肝癌的立体定向放射治疗剂量优化及疗效研究"

摘　　要：目的:通过比对第5代射波刀金标追踪仰卧位与俯卧位治疗的照射精度,为射波刀金标追踪采用俯卧位治疗的可行性提供理论依据。方法:分别扫描仰卧位与俯卧位两种体位下的头颈模体,在射波刀治疗计划系统中设计模体验证计划,在头颈部模体中安装胶片并执行该计划,仰卧位与俯卧位各重复测量5次,得到仰卧位与俯卧位治疗的两组胶片,通过软件分析对比两种体位的照射精度。结果:仰卧位和俯卧位两种体位下模体误差结果分别为(0.3980±0.11212)mm和(0.2660±0.11437)mm,两组数据的均值比较差异有统计学意义(t=2.963,P<0.05),而俯卧位的误差均值低于仰卧位,且均小于射波刀安全治疗要求(0.90 mm),符合美国医学物理家协会(AAPM)TG-135报告中的要求。结论:射波刀金标追踪采用俯卧位治疗具有可行性。Objective: To compare the radiation precision of metal marker tracing of G5 Cyberknife between supine and prone position treatment so as to provide theoretical foundation for the feasibilities of prone treatment by using metal marker tracing of Cyberknife. Methods: A head-neck phantom under supine and prone position were scanned by CT, respectively. The verifying plans of the phantom were designed in CyberKnife treatment planning system and these plans were executed with films set up in the phantom. And the phantom of supine and prone position were repeatedly measured 5times, respectively. And then, the films of two groups of supine and prone position were obtained. The radiation precision of two kinds of positions were analyzed by software. Results: The difference of average error between the supine(0.3980±0.11212mm) and prone(0.2660±0.11437mm) positions were significantly(t=2.963, P<0.05). And the average error of prone group was significantly lower than that of supine group, and both of them were lower than the requirement(0.90 mm) of safety treatment of Cyberknife. Therefore, they conformed to the requirement of(AAPM)TG-135 report. Conclusion: It is feasible that prone position treatment is adopted by metal marker tracing of CyberKnife.

关 键 词：射波刀 金标追踪 仰卧位 俯卧位 照射精度 

分 类 号：R815.2[医药卫生—放射医学]