射波刀金标追踪仰卧位与俯卧位照射精度的对比

36 ZHONGGUO

YIXUEZHUANGBEI

学术论著

收稿日期：2018-10-10

*基金项目：首都特基金(Z151100004015002)“首都特-原发性肝癌的立体定向放射剂量优化及疗效研究”①解放军总医院第五医学中心肿瘤放射中心北京 100071*通信作者：duanxuezhang2006@163

作者简介：丁俊强，男，(1991- )，本科学历，技师，从事物理师工作。

[文章编号] 1672-8270(2019)01-0036-04 [中图分类号] R815.2 [文献标识码] A

Comparison of the radiation precision of metal marker tracing of Cyberknife between supine and prone position treatment/DING Jun-qiang, PIAO Jun-jie, XU Hui-jun, et al//China Medical Equipment,2019,16(1):36-39.

[Abstract] Objective: T o 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.

[Key words] CyberKnife; Metal marker tracking; Supine position; Prone position; Radiation precision

[First-author’s address] Center of Radiotherapy for Carcinoma, The 5th Medical Center, General Hospital of PLA, Beijing 100071, China.

[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的照射精度，为射波刀金标追踪采用俯卧位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具有可行性。

塑料水嘴[关键词] 射波刀；金标追踪；仰卧位；俯卧位；照射精度DOI: 10.3969/J.ISSN.1672-8270.2019.01.010

丁俊强① 朴俊杰① 徐慧军① 孙静① 王佳① 王东方① 段学章①*

射波刀金标追踪仰卧位与俯卧位

照射精度的对比

射波刀[1]是由美国斯坦福大学John Adler [2]教授所研发，并于2001年获得美国食品药品监督管理局(Food and Drug Administration，FDA)认证，可用于全身各部位肿瘤的新型立体定向放射设备，具有影像引导，实时追踪等功能。患者时，两个与水平面成45°夹角的X射线机发出X射线穿过人体，经地面的

平板探测器采集所得影像重建后与患者前数字化重建影像(digitally reconstructed radiograph，DRR)

进行配准来引导摆位，借由6 D颅骨追踪、脊柱追踪、金标追踪、呼吸追踪以及肺追踪五种追踪方式[3]来，并通过6轴机械臂[库卡(KUKA)多关节工业机器人]实时修正误差，从而实现精准放射[4]。

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