基于MIMI模体对Truebeam加速器影像系统的质量保证

发布时间：2018-05-26 00:00

本文选题：放射治疗计划 + 计算机辅助　；参考：《中国医学影像学杂志》2015年07期

【摘要】：目的通过MIMI模体对Truebeam加速器影像系统进行常规的质量保证,验证Truebeam加速器影像验证系统几何中心及治疗床移床的准确性。资料与方法将MIMI模体通过CT扫描得到其参考图像,并将参考图像传至治疗计划系统,制作简单的影像验证计划,然后将MIMI模体摆位到加速器上分别执行MV曝光、KV曝光和锥形束CT扫描,将曝光和扫描后得到的影像分别与其参考图像进行配准,得出影像系统的几何位置误差。结果通过持续6个月的测量验证,Truebeam加速器影像系统几何中心各方向上误差和治疗床移床误差均值未超过1 mm,测量验证的稳定性也比较满意。根据美国医学物理学家协会第142号报告的建议,开展立体定向放射治疗手术和体部立体定向放射治疗的加速器影像系统几何中心误差和治疗床移床误差应小于1 mm。结论 Truebeam加速器影像系统的几何中心及治疗床的移床精度安全可靠,建议Truebeam加速器影像系统几何中心及治疗床移床误差的质量保证可以每月进行一次测量验证,不需要每周都进行测量验证。
[Abstract]:Objective to verify the accuracy of the geometric center of the Truebeam accelerator image verification system and the accuracy of the bed moving bed for the treatment bed of the Truebeam accelerator imaging system through the conventional quality assurance of the Truebeam accelerator imaging system. The reference images were obtained by the CT scanning of the MIMI model body and the reference images were passed to the treatment plan system to make a simple image test. To verify the plan, the MIMI model body is placed on the accelerator to perform MV exposure, KV exposure and conical beam CT scanning respectively. The images obtained from the exposure and scanning are registered with the reference images respectively, and the geometric position error of the image system is obtained. The results are verified by 6 months' measurement, and the geometric center of the Truebeam accelerator imaging system is different. The mean value of the direction error and the bed moving bed error is not more than 1 mm, and the stability of the test verification is satisfactory. According to the recommendation of the American medical physicist Association 142nd report, the geometric center error of the accelerator imaging system and the bed shifting bed error of the stereotactic radiotherapy operation and body stereotactic radiotherapy should be carried out. The geometric center of the Truebeam accelerator imaging system and the bed shifting precision of the treatment bed are safe and reliable. It is suggested that the quality assurance of the geometric center of the Truebeam accelerator imaging system and the bed moving bed error of the treatment bed can be verified once a month, and it does not need to be tested every week for the measurement of the Truebeam.
【作者单位】：汕头大学医学院附属肿瘤医院放射治疗科;
【分类号】：R730.55

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