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于浪, 杨波, 孙玉亮, 孙显松, 王欣海, 李文博, 姜斐, 李楠, 邱杰, 张福泉. Checkmate 2用于放射治疗加速器输出剂量检测的可行性[J]. 协和医学杂志, 2016, 7(1): 33-36. DOI: 10.3969/j.issn.1674-9081.2016.01.007
引用本文: 于浪, 杨波, 孙玉亮, 孙显松, 王欣海, 李文博, 姜斐, 李楠, 邱杰, 张福泉. Checkmate 2用于放射治疗加速器输出剂量检测的可行性[J]. 协和医学杂志, 2016, 7(1): 33-36. DOI: 10.3969/j.issn.1674-9081.2016.01.007
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Lang YU, Bo YANG, Yu-liang SUN, Xian-song SUN, Xin-hai WANG, Wen-bo LI, Fei JIANG, Nan LI, Jie QIU, Fu-quan ZHANG. Feasibility of Checkmate 2 in Radiotherapy Accelerator Output Check[J]. Medical Journal of Peking Union Medical College Hospital, 2016, 7(1): 33-36. DOI: 10.3969/j.issn.1674-9081.2016.01.007
Citation: Lang YU, Bo YANG, Yu-liang SUN, Xian-song SUN, Xin-hai WANG, Wen-bo LI, Fei JIANG, Nan LI, Jie QIU, Fu-quan ZHANG. Feasibility of Checkmate 2 in Radiotherapy Accelerator Output Check[J]. Medical Journal of Peking Union Medical College Hospital, 2016, 7(1): 33-36. DOI: 10.3969/j.issn.1674-9081.2016.01.007
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Checkmate 2用于放射治疗加速器输出剂量检测的可行性

Feasibility of Checkmate 2 in Radiotherapy Accelerator Output Check

    摘要
  • 摘要:
      目的  探讨Checkmate 2作为日检工具用于放射治疗加速器输出剂量检测的可行性。
      方法  按照国际原子能机构(International Atomic Energy Agency, IAEA)第277号报告建议方法刻度Varian 2300CD加速器的两档光子线6、15 MV及五档电子线6、9、12、16、20 MeV, 每日分别使用指型电离室和Checkmate 2测量各档能量100 MU的输出量, 得出各自剂量偏差, 最大允许偏差为±2%。分别实测环境温度气压值和读取Checkmate 2温度气压显示值, 计算温度气压修正因子。连续进行3个月工作日共66次测量, 比较每日各档能量测量值以及温度气压修正准确性。
      结果  各档能量的电子线及X射线的Checkmate 2与指型电离室测量结果均满足绝对剂量偏差不超过2%的标准, 且两者比较差异均无统计学意义(P > 0.05)。实测及Checkmate 2测量得出的平均温度气压修正因子分别为1.032±0.007和1.033±0.007, 两者差异无统计学意义(P=0.452);相关性分析显示两者呈正相关(r=0.92, P=0.000)。
      结论  Checkmate 2可真实反映加速器剂量输出的大体趋势, 且测量工作耗时短、操作简便, 是直线加速器晨检剂量输出检测的良好工具。

     

    Abstract:
      Objective  To discuss the feasibility of Checkmate 2 as a daily check device in radiotherapy accelerator output check.
      Methods  According to the methods proposed in International Atomic Energy Agency(IAEA) Report No. 277, Varian 2300CD accelerator's two photon beams (6 MV and 15 MV) and 5 electronic beams (6, 9, 12, 16, and 20 MeV) were calibrated. Ionization chamber and Checkmate 2 were used to measure the output of the beam at 7 energies delivering 100 MU every day. Maximum permissible error was ±2%. Ambient temperature and air pressure were measured and also detected by Checkmate 2 to calculate the correction factor. A total of 66 continuous measurements were carried out in workdays in 3 months to compare the measurements at different energies and accuracy of temperature and air pressure correction factor every day.
      Results  In the measurement results of both Checkmate 2 and ionization chamber, the absolute dose errors were within 2%, and the differences between the two measurement results showed no statistically significant difference (P > 0.05). Measured and Checkmate 2-calculated mean temperature and pressure correction factor were 1.032±0.007 and 1.033±0.007, respectively, with no significant difference(P=0.452). Correlation analysis showed that the two correction factors were positively correlated (r=0.92, P=0.000).
      Conclusions  Checkmate 2 could reflect the dose output with short measurement time and simple operation. It may be applied as a very useful device for linear accelerator output morning check.

     

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