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首页> 外文期刊>Acta oncologica. >Comparison of two Monte Carlo-based codes for small-field dose calculations in external beam radiotherapy
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Comparison of two Monte Carlo-based codes for small-field dose calculations in external beam radiotherapy

机译：两种蒙特卡罗基法规对外梁放射疗法小场剂量计算的比较

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摘要

Small treatment fields are increasingly used with modern radiotherapy (RT) techniques, such as in stereotactic radiotherapy (SRT) [1]. The use of small fields enables more precise treatment, but with the cost of increased uncertainty in dos-imetry because the reference conditions based on conventional Codes of Practice cannot be fully established [2]. Monte Carlo (MC) calculation methods provide an efficient way to investigate dosimetry in RT under non-reference conditions and they are considered to be the most accurate methods [3,4]. In this study, dose calculations performed with two user codes of the EGSnrc software package were compared: DOSRZnrc and egs_chamber [5]. With the DOSRZnrc, the dose is scored in a cylindrical geometry, while the more recent egs_chamber provides a versatile geometry library. To our knowledge, these two user codes have not been compared earlier. In many studies [6-8], MC codes have been compared, but not user codes of the same package. Moreover, the studies, which have used both DOSRZnrc and egs_cham-ber codes [9-11] in dose calculations have not compared the results in the same geometries. Similar results for both codes would encourage the use of the egs_chamber over the traditional DOSRZnrc considering the versatility of simulation geometries with the egs_chamber. Accuracy of the MC volume calculations, percentage depth dose (PDD) curves and profile calculations was verified through comparison with measurements performed with a micro-ionization chamber.
机译：小型处理领域越来越多地与现代放射疗法（RT）技术一起使用，例如在立体定向放射疗法（SRT）[1]中。使用小领域的使用使得能够更精确的处理，但是由于基于常规实践守则的参考条件，不能完全建立[2]，以增加更精确的处理，而是增加了不确定性的成本不能完全建立[2]。蒙特卡罗（MC）计算方法提供了在非参考条件下在室温下调查剂量测定的有效方法，并且它们被认为是最准确的方法[3,4]。在本研究中，使用了使用EGSNRC软件包的两个用户代码进行的剂量计算：DosrzNRC和EGS_Chamber [5]。通过DosrzNRC，剂量在圆柱形几何中得分，而近期EGS_Chamber则提供多功能的几何库。据我们所知，这两个用户代码尚未比较。在许多研究中，已经比较了MC代码，而不是相同包装的用户代码。此外，使用DOSRZNRC和EGS_CHAM-BER码[9-11]在剂量计算中使用的研究尚未将结果与相同几何形状中的结果进行比较。与EGS_Chamber一起模拟几何形状的多功能性，两种代码的类似结果将鼓励使用EGS_Chamber在传统的DosrzNRC上使用仿真几何形状的功能。通过与用微电离室进行的测量相比，通过比较验证MC体积计算的精度，百分比深度剂量（PDD）曲线和轮廓计算。

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