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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >The ESTRO-QUALity assurance network (EQUAL).
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The ESTRO-QUALity assurance network (EQUAL).

机译：ESTRO-质量保证网络（EQUAL）。

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BACKGROUND AND PURPOSE: ESTRO has set up a Quality Assurance network (EQUAL) to check the dose delivered on axis in reference and non-reference conditions for external radiotherapy. The external audits covered by the network are based on measurements made with mailed thermoluminescent dosimeters (TLD). MATERIAL AND METHODS: The TLD consist of LiF powder type DTL 937 read with a PCL 3 automatic TLD reader. The participating centres are instructed to deliver to the TLDs absorbed doses of 2 Gy calculated with the Treatment Planning System used in clinical routine. A maximum of three photon energies by participating centre have been checked with 10 on-axis points per beam. The quantities checked include the reference beam output, beam output variation with collimator opening, depth dose data and wedge transmission factor. RESULTS: During the 1998 EQUAL programme 102 centres have been checked corresponding to 235 beams (28 (60)Co beams and 207 X-ray beams). About 3% of the outputs in reference conditions show deviations outside tolerance level (>+/-5%). A similar rate of deviation is noted for the percentage depth doses. A rate of deviation (6%) has been observed for the beam output variation (open and wedged beams) and the wedge transmission factor. The analysis of the results shows that for 24 out of the 102 centres, a deviation outside tolerance level is observed at least in one point, mainly for the large and rectangular field sizes and for the wedged beams. CONCLUSIONS: The results for the EQUAL programme show the importance of a quality assurance network in Radiotherapy especially for the non reference points even if they are only located on the beam axis (In order to participate in this network, please contact EQUAL secretariat or download the attached application form ESTRO web site: Dr I.H. Ferreira or Mrs Aline Mechet, EQUAL-ESTRO, Physics Department, Institut Gustave-Roussy 39 Rue Camille Desmoulins, F-94805 Villejuif Cedex, France. e-mail:equal@igr.fr or http://www.estro.be/).
机译：背景与目的：ESTRO建立了质量保证网络（EQUAL），以检查在外部放射疗法的参考和非参考条件下在轴上递送的剂量。网络覆盖的外部审核是基于邮寄的热发光剂量计（TLD）进行的测量。材料与方法：TLD包括DPC 937型LiF粉末，可通过PCL 3自动TLD读取器读取。指示参与中心将使用临床常规治疗计划系统计算出的2 Gy吸收剂量输送至TLD。参与中心最多检查了三个光子能量，每个光束有10个同轴点。检查的量包括参考光束输出，光束输出随准直仪开口的变化，深度剂量数据和楔形透射率。结果：在1998年的EQUAL程序中，检查了102个中心，它们对应于235束光束（28（60）Co束光束和207 X射线束）。在参考条件下，约3％的输出显示出超出公差水平的偏差（> +/- 5％）。对于百分比深度剂量，注意到相似的偏差率。对于光束输出变化（开放光束和楔形光束）和楔形透射系数，已观察到偏差率（6％）。结果分析表明，对于102个中心中的24个，至少在一个点上观察到了超出公差水平的偏差，主要是对于较大的矩形场和楔形梁。结论：EQUAL计划的结果表明，放射治疗质量保证网络的重要性，特别是对于非参考点，即使它们仅位于光束轴上（要参与该网络，请联系EQUAL秘书处或下载EQUAL秘书处）。所附的ESTRO网站申请表：IH Ferreira博士或Gustave-Roussy研究所物理系ESTAL-ESTRO女士Aline Mechet女士39 Rue Camille Desmoulins，F-94805 Villejuif Cedex，法国，电子邮件：equal@igr.fr或http ：//www.estro.be/）。

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