医用直线加速器发射的mv光子光束的一级、二级和三级剂量学质量审计比较

Q4 Health Professions
K. Masood, A. Ullah, A. Hussain, Kh. Mahmood, Gregory R. Hart, W. Muhammad
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引用次数: 1

摘要

背景:剂量学审计对于将规定的辐射剂量安全地传递到癌区具有重要作用。它不仅维持和提高治疗标准,而且还确定对患者有潜在危害的问题。本文介绍了从医用直线加速器发射的高能光子光束输出测量的比较研究结果。材料和方法:测量由国际原子能委员会(原子能机构)质量保证/质量控制调查团(一级剂量测定)、国家二级标准剂量测定实验室(SSDL)专家(二级剂量测定)和医院物理学家(三级剂量测定)进行。按照国际原子能机构TRS-398方案,在水中使用一级玻璃剂量计和圆柱形电离室以及二级和三级圆柱形电离室进行剂量测定。结果:对玻璃剂量计和电离室的一级剂量测定结果进行了比较,6和15 mv光子束流的误差分别为- 0.4%和0.3%。同样,二级和三级剂量测定结果相对于一级具有良好的一致性,且在±5%的最佳不确定度范围内。年度二级剂量学质量审计(即2010年至2015年)表明,只有一次剂量学审计超出了本研究的最佳水平集。然而,它在二级质量审核程序的公差范围内(即<±5%)。结论:本文给出了一致的mv光子束放射剂量学结果。结果表明,该方法的定量信息符合目前所达到的外兆压光子束剂量测定的准确度和精密度。此外,本研究还为目前放射剂量学的常规审计建立了基线。这种类型的研究对于适当地遵循相关剂量学方案的建议和程序是必不可少的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of level-I, -II and -III dosimetry quality audits for MV-photon beams emitted from medical linear accelerators
Background: Dosimetry audits have an important role to safely deliver the prescribed radiation dose to the cancerous area. It not only maintains and improve the treatment standards but also identify issues that are potentially harmful to the patients. This article presents the results of a comparative study of beam output measurements of a high-energy photon beam emitted from a medical linear accelerator. Materials and Methods: The measurements were performed by an International Atomic Energy Commission (IAEA) Quality Assurance/Quality Control survey mission (level-I dosimetry), a national Secondary Standard Dosimetry Laboratory (SSDL) experts (level-II dosimetry) and hospital physicists (level-III dosimetry). Glass dosimeters and cylindrical ionization chambers for level I and cylindrical ionization chambers for level-II and -III dosimetry were used in water by following IAEA TRS-398 protocol. Results: The level-I dosimetry results of glass dosimeters and ionization chambers were compared and percent deviations of -0.4 % and 0.3 % were found for 6 and 15 MV-photon beams, respectively. Similarly, level-II and -III dosimetry results with respect to level-I are in good agreement and within the optimum uncertainty level of ±5%. The annual level-II dosimetry quality audits (i.e., from 2010 to 2015) showed that only one dosimetry audit is out of the optimum level set for this study. However, it is within the tolerance level set for level-II quality audit programs (i.e., < ±5%). Conclusion: In conclusion, this article has demonstrated consistent radiotherapy radiation dosimetry results for MV-photons beams. It also showed quantitative information in-line with the currently achieved accuracy and precision of external megavoltage photon beam dosimetry. Furthermore, this study also established a baseline for current routine audits of radiotherapy dosimetry. Studies of this type are essential to appropriately follow the recommendations and procedures of the pertinent dosimetry protocols.
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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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