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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >A methodology for dosimetry audit of rotational radiotherapy using a commercial detector array
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A methodology for dosimetry audit of rotational radiotherapy using a commercial detector array

机译：使用商用探测器阵列进行旋转放射疗法剂量学审核的方法

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Purpose To develop a methodology for the use of a commercial detector array in dosimetry audits of rotational radiotherapy. Materials and methods The methodology was developed as part of the development of a national audit of rotational radiotherapy. Ten cancer centres were asked to create a rotational radiotherapy treatment plan for a three-dimensional treatment-planning-system (3DTPS) test and audited. Phantom measurements using a commercial 2D ionisation chamber (IC) array were compared with measurements using 0.125 cm3 IC, Gafchromic film and alanine pellets in the same plane. Relative and absolute gamma index (γ) comparisons were made for Gafchromic film and 2D-Array planes, respectively. Results Comparisons between individual detectors within the 2D-Array against the corresponding IC and alanine measurement showed a statistically significant concordance correlation coefficient (both ρc 0.998, p 0.001) with mean difference of -1.1 ± 1.1% and -0.8 ± 1.1%, respectively, in a high dose PTV. In the γ comparison between the 2D-Array and film it was that the 2D-Array was more likely to fail planes where there was a dose discrepancy due to the absolute analysis performed. Conclusions It has been found that using a commercial detector array for a dosimetry audit of rotational radiotherapy is suitable in place of standard systems of dosimetry.
机译：目的开发一种在旋转放射疗法的剂量学审核中使用商用检测器阵列的方法。材料和方法该方法是作为旋转放射疗法国家审核的一部分开发的。十个癌症中心被要求为三维治疗计划系统（3DTPS）测试创建旋转放射治疗计划并进行审核。使用商用2D电离室（IC）阵列进行的幻像测量与使用0.125 cm3 IC，Gafchromic膜和丙氨酸颗粒在同一平面上进行的测量进行了比较。分别对Gafchromic胶片平面和2D阵列平面进行了相对和绝对伽玛指数（γ）的比较。结果2D阵列中各个检测器与相应IC和丙氨酸测量值之间的比较显示出统计学上显着的一致性相关系数（ρc> 0.998，p <0.001），平均差异为-1.1±1.1％和-0.8±1.1％，在大剂量的PTV中在2D阵列和胶片之间的γ比较中，由于进行了绝对分析，因此2D阵列更有可能在出现剂量差异的平面失效。结论已经发现，使用商业探测器阵列进行旋转放射疗法的剂量学审核可代替标准的剂量学系统。

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