[A Survey Towards Standardization of Dosimetric Verification in Intensity-modulated Radiation Therapy].
[A Survey Towards Standardization of Dosimetric Verification in Intensity-modulated Radiation Therapy].
复制标题
[调强放射治疗中剂量验证标准化的调查]。
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
H. Monzen
中科院分区：
文献类型：
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作者：
M. Nakamura;H. Iramina;Masanori Takamiya;T. Ono;M. Akimoto;N. Mukumoto;Y. Ishihara;S. Utsunomiya;T. Shiinoki;Y. Miyabe;S. Sato;H. Monzen
目的
本研究的目的是通过问卷调查调查日本调强放射治疗（IMRT）质量保证（QA）的实施状况。
方法
调查问卷由七个部分组成：(1) IMRT 的临床应用，(2) 治疗计划系统、治疗机器、用于验证和 CT 扫描的体模，(3) 吸收剂量验证，(4) 剂量分布验证，(5) 能量流图验证，(6) 每次验证的接受标准，以及 (7) 评论。
结果
调查由 129 家机构完成（回复率：76.8%）。 125 个机构 (96.9%) 进行了前列腺癌 IMRT 治疗，其次是 83 个机构 (64.3%) 进行了头颈癌治疗，还有 69 个机构 (53.5%) 进行了脑肿瘤治疗。尽管 77.5% 的机构至少有 3 名人员从事 IMRT QA，但在 94 家机构（72.9%）中，参与 IMRT QA 的全职人员数量为 1 人或更少。这表明日本大多数机构都存在人员短缺的问题。超过90%的机构验证了吸收剂量和剂量分布。至少 80% 的机构将吸收剂量验证的接受标准设置为 ±3%。大多数剂量分布验证都使用了增色膜。剂量分布验证的验收标准主要涉及伽玛分析和剂量分布比较；然而，接受的判断并不取决于伽玛分析的结果。
结论
这项调查加深了我们对机构目前如何进行 IMRT QA 分析的了解。这种理解将有助于推动日本机构的 IMRT QA 更加标准化。
PURPOSE
The purpose of this study was to investigate the status of the implementation of quality assurance (QA) for intensity-modulated radiation therapy (IMRT) in Japan using a questionnaire survey.
METHODS
The questionnaire consisted of seven sections: (1) clinical uses of IMRT, (2) treatment planning systems, treatment machines, phantoms for verification and CT scanning, (3) absorbed dose verification, (4) dose distribution verification, (5) fluence map verification, (6) acceptance criteria for each verification, and (7) comments.
RESULTS
The questionnaire was completed by 129 institutions (response rate: 76.8%). IMRT was performed for prostate cancer in 125 institutions (96.9%), followed by head and neck cancer in 83 (64.3%), and brain tumors in 69 (53.5%). Although at least three individuals were engaged in IMRT QA in 77.5% of the institutions, the number of full-time persons involved in IMRT QA was one or less in 94 institutions (72.9%). This indicated that most institutions in Japan have a staff shortage. More than 90% of the institutions verified both the absorbed dose and dose distribution. The acceptance criterion for the absorbed dose verification was set to ±3% in at least 80% of the institutions. Gafchromic film was used for the majority of dose distribution verifications. The acceptance criteria for dose distribution verification mainly involved gamma analysis and a comparison of dose profiles; however, the judgment of acceptance did not depend on the results of the gamma analysis.
CONCLUSION
This survey increases our understanding of how institutions currently perform IMRT QA analysis. This understanding will help to move institutions toward more standardization of IMRT QA in Japan.