首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Dosimetry quality audit of high energy photon beams in greek radiotherapy centers.
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Dosimetry quality audit of high energy photon beams in greek radiotherapy centers.

机译:希腊放射治疗中心高能光子束的剂量学质量审核。

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BACKGROUND AND PURPOSE: Dosimetry quality audits and intercomparisons in radiotherapy centers is a useful tool in order to enhance the confidence for an accurate therapy and to explore and dissolve discrepancies in dose delivery. This is the first national comprehensive study that has been carried out in Greece. During 2002--2006 the Greek Atomic Energy Commission performed a dosimetry quality audit of high energy external photon beams in all (23) Greek radiotherapy centers, where 31 linacs and 13 Co-60 teletherapy units were assessed in terms of their mechanical performance characteristics and relative and absolute dosimetry. MATERIALS AND METHODS: The quality audit in dosimetry of external photon beams took place by means of on-site visits, where certain parameters of the photon beams were measured, calculated and assessed according to a specific protocol and the IAEA TRS 398 dosimetry code of practice. In each radiotherapy unit (Linac or Co-60), certain functional parameters were measured and the results were compared to tolerance values and limits. Doses in water under reference and non reference conditions were measured and compared to the stated values. Also, the treatment planning systems (TPS) were evaluated with respect to irradiation time calculations. RESULTS: The results of the mechanical tests, dosimetry measurements and TPS evaluation have been presented in this work and discussed in detail. This study showed that Co-60 units had worse performance mechanical characteristics than linacs. 28% of all irradiation units (23% of linacs and 42% of Co-60 units) exceeded the acceptance limit at least in one mechanical parameter. Dosimetry accuracy was much worse in Co60 units than in linacs. 61% of the Co60 units exhibited deviations outside +/-3% and 31% outside +/-5%. The relevant percentages for the linacs were 24% and 7% respectively. The results were grouped for each hospital and the sources of errors (functional and human) have been investigated and discussed in details. CONCLUSION: This quality audit proved to be a useful tool for the improvement of quality in radiotherapy. It succeeded to disseminate the IAEA TRS-398 protocol in nearly all radiotherapy centers achieving homogenization and consistency of dosimetry within the country. Also, it detected discrepancies in dosimetry and provided guidance and recommendations to eliminate sources of errors. Finally, it proved that quality assurance programs, periodic quality control tests, maintenance and service play an important role for achieving accuracy and safe operation in radiotherapy.
机译:背景与目的:放射治疗中心的剂量学质量审核和比对是一种有用的工具,可增强对准确治疗的信心,并探索和解决剂量输送中的差异。这是在希腊进行的第一项国家综合研究。在2002--2006年期间,希腊原子能委员会对所有(23个)希腊放射治疗中心的高能外部光子束进行了剂量学质量审核,其中对31个直线加速器和13个Co-60远距治疗仪的机械性能特征和相对和绝对剂量。材料与方法:外部光子束剂量学的质量审核是通过现场检查进行的,其中根据特定协议和IAEA TRS 398剂量学操作规范对光子束的某些参数进行了测量,计算和评估。 。在每个放疗单元(Linac或Co-60)中,都测量了某些功能参数,并将结果与​​公差值和极限值进行了比较。测量参考和非参考条件下水中的剂量,并将其与规定值进行比较。此外,就照射时间的计算对治疗计划系统(TPS)进行了评估。结果:机械测试,剂量学测量和TPS评估的结果已在本工作中进行了介绍并进行了详细讨论。这项研究表明,Co-60装置的性能机械特性比直线加速器差。至少一个机械参数中,所有辐照单位的28%(直线加速器的23%和Co-60单位的42%)超过了接受极限。 Co60装置的剂量测定精度比直线加速器差得多。 Co60装置中有61%的偏差超出+/- 3%,而31%的偏差超出+/- 5%。直线加速器的相关百分比分别为24%和7%。对每家医院的结果进行了分组,并对错误来源(功能和人为)进行了调查和详细讨论。结论:该质量审核被证明是改善放射治疗质量的有用工具。它成功地在几乎所有放射治疗中心传播了IAEA TRS-398规程,实现了国内剂量学的均一化和一致性。此外,它还发现了剂量学上的差异,并提供了指导和建议以消除错误源。最后,证明了质量保证程序,定期质量控制测试,维护和服务对于实现放射治疗的准确性和安全操作起着重要作用。

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