基于Varian加速器MPC模块与晨检仪的加速器束流稳定性研究
1. 厦门大学附属翔安医院, 肿瘤放疗科, 福建厦门 361100
2. 厦门大学附属翔安医院, 病案室, 福建厦门 361100
| 摘 要： | 背景：我院自2020年12月开始使用瓦里安VitalBeam直线加速器，精准放疗中加速器束流稳定性的日常质量控制至关重要，本文对两种监测方式在加速器束流稳定性上做比较分析。目的：利用机器性能检测（Machine Performance Check，MPC）以及晨检仪分析研究VitalBeam加速器射线的长期稳定性。方法：选取瓦里安直线加速器（VitalBeam）最常用于患者治疗的6MV、10MV X线能量进行分析比较，首先用剂量仪对直线加速器（Vital Beam）6MV、10MV X线能量进行绝对剂量的校正，建立基准值。收集2021年11月-2022年5月的晨检仪监测加速器（VitalBeam）的日检数据：中心轴输出剂量（CAX）偏移量、对称性（SYM）和平坦度（FLAT）偏移数据，做好统计并记录；同时收集相应时间MPC日检数据：束流输出量改变、均匀度改变和中心偏移量数据，做好统计并记录。对射束输出变化做统计学分析，其他数据做稳定性分析。结果：晨检仪和直线加速器（VitalBeam）MPC模块能准确检测出加速器束流性能的改变，检测数值稳定并都在容差范围内，晨检仪与MPC的6MV、10MV射束输出比较均具有统计学意义（P<0.05）。结论：MPC和晨检仪的日检工作都能满足加速器质检要求，射束输出监测上晨检仪具有优势，但是MPC比晨检仪具有更快的执行效率，根据单位实际需求选择使用。 |
| 关 键 词： | 晨检仪; MPC; 直线加速器; 束流稳定性; 日常检测 |
| DOI： | 10.57237/j.se.2023.02.001 |
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收稿日期: 2022-11-08
接受日期: 2023-03-07
在线出版日期: 2023-03-28
The Beam Stability Study of Varian Linear Accelerator Based on MPC and Morning Check
1. Department of Oncology and Radiotherapy, Xiang’an Hospital Affiliated to Xiamen University, Xiamen 361100, China
2. Department of Medical Records, Xiang’an Hospital Affiliated to Xiamen University, Xiamen 361100, China
| Abstract: | Background: Our hospital has been using Varian VitalBeam linear accelerator since December 2020. Daily quality control of accelerator beam stability in precision radiotherapy is very important. In this paper, we compare and analyze the beam stability of the accelerator with two monitoring methods. Objective: The long-term stability analyze and study of VitalBeam linear accelerator by using machine Machine Performance Check (MPC) and Morning Check. Methods: The energies of 6MV and 10MV x-ray most commonly used by Varian Linear accelerator (VitalBeam) for patient treatment were analyzed and compared，Firstly, the absolute dose of 6MV and 10MV X-ray energies of VitalBeam was calibrated. Collected and analyzed the morning checking data of VitalBeam from November 2021 to May 2022, including the CAX, SYM and FLAT offset data; the MPC daily data was collected and analyzed at the same time, which include beam output change, uniformity change and beam center shift data. The beam output changes were statistically analyzed, and the stability of other data was analyzed. Results: The Morning Check and MPC can accurately detect the change of accelerator beam performance, and the measured values are stable and within the tolerance range，The comparison of 6MV and 10MV beam outputs between the morning detector and MPC was statistically significant (P<0.05). Conclusion: Both MPC and Morning Check can detecte the requirements of accelerator quality assurement, the beam output monitoring morning detector has advantages, but MPC has faster execution efficiency than morning detector instrument, and is more suitable for units with a large number of patients treated daily. |
| Keywords: | Morning Detector; MPC; Linear Accelerator; Beam Stability; Daily Inspection |
基金
| 1. | 厦门市医疗卫生指导项目 (3502Z20209111) |
参考文献
| [1] | 王哲, 程金生. 晨检仪在直线加速器日常质量控制应用中的性能研究 [J]. 中国医学装备, 2018, 15 (4): 43-47. |
| [2] | 习海燕.医用直线加速器TrueBeam剂量输出长期稳定性[J].医疗装备, 2019, 32 (17): 28-29. |
| [3] | KUTCHER G J, COIA L, GILLIN M, et al. Comprehensive QA for radiation oncology: report of AAPM radiation therapy committee task group 40 [J]. Med Phys, 1994, 21 (4): 581-618. |
| [4] | KLEIN E E, HANLEY J, BAYOUTH J, et al. Task Group 142 report: quality assurance of medical accelerators [J]. Med Phys, 2009, 36 (9): 4197-4212. |
| [5] | 赖友群.基于MPC的VitalBeam直线加速器束流一致性与准直系统性能检测 [J]. 中国医疗器械信息, 2020, 26 (18): 177-180. |
| [6] | 杨玉敏.基于MPC分析VitalBeam加速器的稳定性[J].中国医学工程, 2022, 30 (9): 1-4. |
| [7] | 雷伟杰, 王斌, 韩理想. MPC在Vital Beam加速器性能检测中的应用 [J]. 中国医疗设备, 2020, 35 (11): 73-76. |
| [8] | 蒋大振, 王骁踊, 张俊.运用PTW QUICKCHECK webline晨检仪分析医用加速器输出稳定性 [J]. 中国医学物理学杂志, 2019, 36 (5): 540-545. |
| [9] | 易海云, 夏兵, 姚雷,等.照射野等中心的偏移对 VMAT 计划剂量准确性的影响 [J]. 中国医学物理学杂志, 2017, 34 (8): 794-798. |
| [10] | 柳先锋,刘翔宇,何亚男,等. Varian On-Board Imager (OBI)常规测量方法及质量保证 [J]. 中国医学物理学杂志, 2011, 28 (1): 2344-2347. |
| [11] | 张基永, 吴丽丽, 林珠, 等.基于MIMI模体对Truebeam 加速器影像系统的质量保证 [J]. 中国医学影像学杂志, 2015, 23 (7): 557-560. |
| [12] | 叶淑敏, 滕建建, 石锦平等. MLC 叶片系统误差对鼻咽癌 VMAT和 IMRT 计划剂量影响的比较 [J]. 中国医学物理学杂志, 2019, 36 (10): 1139-1144. |
| [13] | 马蕾杰, 宋迎新, 雷宏昌等. XHA600E型国产数字化加速器性能检测与对比评价 [J]. 中国医疗设备, 2018, 33 (6): 88-91. |
| [14] | 姜斐, 于浪, 孙显松等. 基于机器性能检查的TrueBeam直线加速器射线稳定性研究 [J]. 中国医学装备, 2022, 19 (5): 13-17. |
| [15] | 吴丽丽, 林浩, 陈泓, 等.医用加速器TrueBeam剂量输出长期稳定性研究 [J]. 中国医学装备, 2014, 11 (6): 34-37. |
