[1]李大明,吴琰,谢金森,等.电子射野影像装置实施医用电子直线加速器晨检的可行性研究[J].中国医学物理学杂志,2025,42(1):14-19.[doi:DOI:10.3969/j.issn.1005-202X.2025.01.003]
　LI Daming,WU Yan,et al.Feasible study on implementing daily quality assurance for linear accelerator with electronic portal imaging device[J].Chinese Journal of Medical Physics,2025,42(1):14-19.[doi:DOI:10.3969/j.issn.1005-202X.2025.01.003]
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电子射野影像装置实施医用电子直线加速器晨检的可行性研究()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
42
期数:
2025年第1期
页码:
14-19
栏目:
医学放射物理
出版日期:
2025-01-19

文章信息/Info

Title:
Feasible study on implementing daily quality assurance for linear accelerator with electronic portal imaging device
文章编号:
1005-202X（2025）01-0014-06
作者:
李大明1; 2; 吴琰3; 谢金森1; 彭照明2; 杨鹏飞2; 张哲2; 刘雅洁2
1.南华大学核科学技术学院， 湖南 衡阳 421001； 2.北京大学深圳医院放射治疗科， 广东 深圳 518036； 3.深圳市第三人民医院设备科， 广东 深圳 518112
Author(s):
LI Daming1;  2;  WU Yan3;  XIE Jinsen1;  PENG Zhaoming2;  YANG Pengfei2;  ZHANG Zhe2;  LIU Yajie2
1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China 2. Department of Radiation Oncology, Peking University Shenzhen Hospital, Shenzhen 518036, China 3. Department of Medical Equipment, Shenzhen Third Peoples Hospital, Shenzhen 518112, China
关键词:
电子射野影像装置; 平坦度; 对称性; 晨检; 直线加速器
Keywords:
Keywords: electronic portal imaging device flatness symmetry daily quality assurance linear accelerator
分类号:
R318；R815
DOI:
DOI:10.3969/j.issn.1005-202X.2025.01.003
文献标志码:
A
摘要:
目的：通过对电子射野影像装置（EPID）在机械和剂量响应方面性能的研究，探讨其作为晨检设备的可行性。方法：首先对Trilogy直线加速器的EPID进行机械到位重复性、剂量线性响应测试；其次编辑一组模拟射野平移和对称性偏移的射野，检测EPID和MyQA Daily晨检仪对平移和对称性偏移的响应，并比较设置值和测量值之间的线性相关性；最后用EPID和MyQA Daily晨检仪连续30 d对加速器晨检，分析其测量结果及耗时。结果：EPID位置重复性最大偏差0.4 mm；剂量响应线性相关（R2>0.999）。在对称性偏移测试中，均能有效检测0.2%偏移且设置值和测量值之间线性相关（R2>0.995）；平移测试中，EPID线性略优于晨检仪（R2=0.992 vs R2=0.976）。晨检任务中两者所有测量结果均在允许范围内，Y方向对称性和平坦度结果显示EPID和晨检仪测量值相差可达1.00%以上，其他数据表现相近。耗时结果表明EPID平均用时（129.97±4.16） s，比MyQA Daily晨检仪平均用时（184.53±4.23） s节省超过50 s。结论：EPID可以作为一种可靠、省时的晨检设备执行日常加速器晨检工作，但是不能作为加速器性能判断标准。
Abstract:
Abstract: Objective To analyze the performances of electronic portal imaging device (EPID) in mechanical and dosimetry responses, and to investigate the feasibility of adopting EPID as a daily quality assurance (QA) equipment. Methods The EPID of Trilogy linear accelerator was tested for mechanical position repeatability and dose linear response. Then, a group of special fields were edited manually for simulations of field translation and symmetry deviations, and the sensitivities of EPID and MyQA Daily to field translation and symmetry deviations were evaluated, and moreover, the linear correlation between the set value and the measured value was analyzed. Finally, daily QA was conducted with EPID and MyQA Daily for 30 consecutive days, and the measurement results and time consumption were analyzed. Results The maximum deviation of EPID position repeatability was 0.4 mm, and the dose response was linearly correlated (R2>0.999). The symmetry deviation test results showed that both of EPID and MyQA Daily were capable to effectively detect the 0.2% offset in symmetry, and a linear correlation was demonstrated between the set value and the measured results (R2>0.995). In translation test, the linear correlation of EPID was more explicit than that of MyQA Daily (R2=0.992 vs R2=0.976). In daily QA, all the measured results of EPID and MyQA Daily were within the clinic acceptance tolerance. Moreover, the mean value of Y-directional symmetry and flatness measured by EPID was approximately 1.00% larger than MyQA Daily. The average time required by EPID was 50 s less than MyQA Daily ［(129.97±4.16) s vs (184.53±4.23) s］. Conclusion EPID can be served as a reliable and efficient daily QA equipment for linear accelerator. However, it is not capable to be used as a criterion for evaluating linear accelerator performance.

相似文献/References:

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备注/Memo

备注/Memo:
【收稿日期】2024-08-26 【基金项目】湖南省自然科学基金（2022JJ30481） 【作者简介】李大明，工程师，研究方向：医学物理，E-mail: lidaming1005@163.com 【通信作者】刘雅洁，博士，主任医师，研究方向：肿瘤放射治疗，E-mail: Anthea1966@163.com
更新日期/Last Update: 2025-01-19