Systematic and comprehensive analysis of the dose-response characteristics of a morning quality check of a linear accelerator and an important application of accelerator performance prediction

Q4 Health Professions
D. Jiang, Xinghuan Wang, Z. Dai, Jiuling Shen, Dajiang Wang, Z. Bao, Chen Chen, Hongli Zhao, Jun Chen, C. Xie, Junhong Zhang, Hui Liu
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引用次数: 2

Abstract

Background: This paper aimed to analyze the output constancy of a medical linear accelerator using PTW QUICKCHECK and studied the sensitivity of the PTW QUICKCHECK. Materials and Methods: The paper statistically analyzed the output doses of 6 MV and 10 MV of photons and 6 MeV, 9 MeV, and 12 MeV of electrons from a medical linear accelerator measured before the daily treatment to assess the output stability of a medical linear accelerator. Some modifications were introduced by artificially altering the external irradiation conditions, and the percent variations from baseline values were noted. The gantry angle was changed and some deviations were established in the vertical, longitudinal and lateral directions to study the sensitivity of the PTW QUICKCHECK. The beam flatness, symmetry, radiation quality and output energy of 6 MV of photon energy were statistically analyzed. Results: Among the measurements, no parameters exceeded the tolerance of ±3%. QUICKCHECK was capable of detecting the variations in the central axis dose, flatness, symmetry and radiation quality under the testing conditions. Similar to the photon energy, electron energy measurements also confirmed that the detector was sensitive to a small variation in output introduced by the testing conditions. An important application of accelerator performance prediction in this study confirms the irreplaceable and important function of morning quality checks of a linear accelerator. Conclusions: The output dose measured before daily treatment using PTW QUICKCHECK to analyze the linear accelerator output constancy helps to decrease the system error, effectively reduces the errors of the accelerator system, and avoids serious mistakes.
线性加速器早晨质量检查的剂量反应特性的系统综合分析及加速器性能预测的重要应用
背景:本文旨在利用PTW QUICKCHECK对医用直线加速器的输出常数进行分析,并研究PTW QUICKCHECK的灵敏度。材料与方法:对医用直线加速器每日处理前测量的6 MV、10 MV光子输出剂量和6 MeV、9 MeV、12 MeV电子输出剂量进行统计分析,评估医用直线加速器的输出稳定性。通过人为改变外部照射条件引入了一些修改,并记录了与基线值的百分比变化。改变龙门角度,在垂直、纵向和横向上建立一定的偏差,研究PTW QUICKCHECK的灵敏度。统计分析了光束的平整度、对称性、辐射质量和6 MV光子能量的输出能量。结果:所有测量参数均未超过±3%的公差。QUICKCHECK能够检测检测条件下中心轴剂量、平整度、对称性和辐射质量的变化。与光子能量类似,电子能量测量也证实了探测器对测试条件引入的输出的微小变化很敏感。本研究中加速器性能预测的一个重要应用,证实了直线加速器晨检的不可替代的重要作用。结论:采用PTW QUICKCHECK在每日治疗前测量输出剂量,分析直线加速器输出常数,有助于减少系统误差,有效减少加速器系统误差,避免严重错误。
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来源期刊
Iranian Journal of Radiation Research
Iranian Journal of Radiation Research RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
0.67
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Iranian Journal of Radiation Research (IJRR) publishes original scientific research and clinical investigations related to radiation oncology, radiation biology, and Medical and health physics. The clinical studies submitted for publication include experimental studies of combined modality treatment, especially chemoradiotherapy approaches, and relevant innovations in hyperthermia, brachytherapy, high LET irradiation, nuclear medicine, dosimetry, tumor imaging, radiation treatment planning, radiosensitizers, and radioprotectors. All manuscripts must pass stringent peer-review and only papers that are rated of high scientific quality are accepted.
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