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首页> 外文期刊>Medical Physics >Tolerance limits and methodologies for IMRT IMRT measurement‐based verification QA QA : Recommendations of AAPM Task Group No. 218 Recommendations of AAPM AAPM Task Group No. 218
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Tolerance limits and methodologies for IMRT IMRT measurement‐based verification QA QA : Recommendations of AAPM Task Group No. 218 Recommendations of AAPM AAPM Task Group No. 218

机译：基于IMRT IMRT测量的验证QA QA的公差限制和方法：AAPM任务组的建议218 AAPM AAPM任务组第218号的建议

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摘要

Purpose Patient‐specific IMRT QA measurements are important components of processes designed to identify discrepancies between calculated and delivered radiation doses. Discrepancy tolerance limits are neither well defined nor consistently applied across centers. The AAPM TG ‐218 report provides a comprehensive review aimed at improving the understanding and consistency of these processes as well as recommendations for methodologies and tolerance limits in patient‐specific IMRT QA . Methods The performance of the dose difference/distance‐to‐agreement ( DTA ) and γ dose distribution comparison metrics are investigated. Measurement methods are reviewed and followed by a discussion of the pros and cons of each. Methodologies for absolute dose verification are discussed and new IMRT QA verification tools are presented. Literature on the expected or achievable agreement between measurements and calculations for different types of planning and delivery systems are reviewed and analyzed. Tests of vendor implementations of the γ verification algorithm employing benchmark cases are presented. Results Operational shortcomings that can reduce the γ tool accuracy and subsequent effectiveness for IMRT QA are described. Practical considerations including spatial resolution, normalization, dose threshold, and data interpretation are discussed. Published data on IMRT QA and the clinical experience of the group members are used to develop guidelines and recommendations on tolerance and action limits for IMRT QA . Steps to check failed IMRT QA plans are outlined. Conclusion Recommendations on delivery methods, data interpretation, dose normalization, the use of γ analysis routines and choice of tolerance limits for IMRT QA are made with focus on detecting differences between calculated and measured doses via the use of robust analysis methods and an in‐depth understanding of IMRT verification metrics. The recommendations are intended to improve the IMRT QA process and establish consistent, and comparable IMRT QA criteria among institutions.
机译：目的患者特定的IMRT QA测量是旨在识别计算和交付的辐射剂量之间的差异的过程的重要组成部分。差异差分限制既不明确，也不会持续应用于中心。 AAPM TG -218报告提供了全面的审查，旨在提高这些进程的理解和一致性以及患者特定IMRT QA中的方法和耐受性限制的建议。方法研究了剂量差/距离（DTA）和γ剂量分布比较度量的性能。审查测量方法，然后讨论每个人的利弊。讨论了绝对剂量验证的方法，并提出了新的IMRT QA验证工具。对不同类型规划和交付系统的测量和计算之间的预期或可实现的协议的文献进行了审查和分析。呈现了采用基准情况的γ验证算法的供应商实现的测试。结果描述了可以降低IMRT QA的γ工具精度和随后有效性的操作缺陷。讨论了包括空间分辨率，归一化，剂量阈值和数据解释的实践考虑因素。发布关于IMRT QA的数据以及集团成员的临床经验用于制定关于IMRT QA的容忍度和行动限额的指导方针和建议。概述了检查失败的步骤IMRT QA计划。结论关于递送方法的建议，数据解释，剂量标准化，使用γ分析程序的使用以及IMRT QA的耐受性限制的选择，专注于通过使用鲁棒分析方法和深入检测计算和测量剂量之间的差异了解IMRT验证指标。该建议旨在改善IMRT QA流程，并在机构中建立一致，可比的IMRT QA标准。

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  • 来源
    《Medical Physics》 |2018年第4期|共31页
  • 作者

    Miften Moyed; Olch Arthur; Mihailidis Dimitris; Moran Jean; Pawlicki Todd; Molineu Andrea; Li Harold; Wijesooriya Krishni; Shi Jie; Xia Ping; Papanikolaou Nikos; Low Daniel A.;

  • 作者单位

    Department of Radiation OncologyUniversity of Colorado School of MedicineAurora CO USA;

    Department of Radiation OncologyUniversity of Southern California and Radiation Oncology ProgramLos;

    Department of Radiation OncologyUniversity of PennsylvaniaPhiladelphia PA USA;

    Department of Radiation OncologyUniversity of MichiganAnn Arbor MI USA;

    Department of Radiation OncologyUniversity of California San DiegoLa Jolla CA USA;

    Radiological Physics CenterUT MD Anderson Cancer CenterHouston TX USA;

    Department of Radiation OncologyWashington UniversitySt. Louis MO USA;

    Department of Radiation OncologyUniversity of VirginiaCharlottesville VA USA;

    Sun Nuclear CorporationMelbourne FL USA;

    Department of Radiation OncologyThe Cleveland ClinicCleveland OH USA;

    Department of Medical PhysicsUniversity of Texas Health Sciences CenterSan Antonio TX USA;

    Department of Radiation OncologyUniversity of California Los AngelesLos Angeles CA USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 基础医学;
  • 关键词

    γ; DTA; IMRT QA; tolerance limits;

    机译：γ;DTA;IMRT QA;容忍限制;

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