医用加速器TrueBeam剂量输出长期稳定性研究.pdf

学术论著 中国医学装备2014年6月第11卷第6期 China Medical Equipment 2014 June Vol.11 NO.6 医用加速器TrueBeam剂量输出长期稳定性研究* ① ① ① 吴丽丽 林 浩 陈 泓 [文章编号] 1672-8270(2014)06-0034-04 [中图分类号] R144.1 [文献标识码] A [摘要] 目的： 方 分析并研究瓦里安公司新型直线加速器TrueBeam型号光子束的长期稳定性。 法：采用Standard Imaging公司的QA BeamChecker Plus采集TrueBeam系统6 MV光子线长期 日检数据，并进行系统性分析，评价参数包括中心轴剂量、平坦度及对称性。结果：18个月的日 检数据分析结果显示，6 MV的X射线中心轴剂量偏差为(0.0%±0.7%)，仅1次检测结果＞2%；平 坦度稳定性好，偏差为(0.1%±0.1%)；轴向对称性偏差和横向对称性偏差测量结果均在±1%以 内。结论：TrueBeam医用加速器系统的6 MV光子束具有非常稳定的剂量输出特性。 [关键词] 日检质量控制设备；稳定性；剂量 DOI: 10.3969/J.ISSN.1672-8270.2014.06.011 Evaluation of dose delivery stability of a new linear accelerator TrueBeam/WU Li-li, LIN Hao, CHEN Hong// China Medical Equipment,2014,11(6):34-37. 作者简介 [Abstract] Objective: To study the long-term stability of 6MV photon beam on TrueBeam, which is a new linear accelerator introduced by Varian Medical System. Methods: QA BeamChecker 吴丽丽,女,(1982- ), Plus (QABC+, Standard Imaging Inc., Middleton, USA) was used to measure 6MV X-ray on 硕士，主管技师，医学 TrueBeam linac as daily quality assurance (Daily QA). Dosimetric parameter, including output 物理师。汕头大学医学 Constancy, flatness and symmetry, were employed to evaluate the dose delivery stability of TrueBeam linac. Results: Daily QA results of 18 months showed the dose output delta was 院附属肿瘤医院放疗 (0.0%±0.7%), only once out of tolerance of 2%. The constancy of Flatness was excellent with 科，从事放射治疗设备 the delta of (0.1%±0.1%). The symmetric of axial and transverse varied within 1%. Conclusion: 质量控制和肿瘤放射治 The output constancy of TrueBeam with 6MV is very stable, as well as flatness an