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首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >On the need for monitor unit calculations as part of a beam commissioning methodology for a radiation treatment planning system
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On the need for monitor unit calculations as part of a beam commissioning methodology for a radiation treatment planning system

机译：关于作为辐射治疗计划系统的光束调试方法的一部分需要监视单元的计算

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This paper illustrates the need for validating the calculation of monitor units as part of the process of commissioning a photon beam model in a radiation treatment planning system. Examples are provided in which this validation identified subtle errors, either in the dose model or in the implementation of the dose algorithm. These errors would not have been detected if the commissioning process only compared relative dose distributions. A set of beam configurations, with varying field sizes, source‐to‐skin distances, wedges, and blocking, were established to validate monitor unit calculations for two different beam models in two different radiation treatment planning systems. Monitor units calculated using the treatment planning systems were compared with monitor units calculated from point dose calculations from tissue‐maximum ratio (TMR) tables. When discrepancies occurred, the dose models and the code were analyzed to identify the causes of the discrepancies. Discrepancies in monitor unit calculations were both significant (up to 5%) and systematic. Analysis of the dose computation software found: (1) a coordinate system transformation error, (2) mishandling of dose‐spread arrays, (3) differences between dose calculations in the commissioning software and the planning software, and (4) shortcomings in modeling of head scatter. Corrections were made in the beam calculation software or in the data sets to overcome these discrepancies. Consequently, we recommend incorporating validation of monitor unit calculations as part of a photon beam commissioning process.PACS number(s): 87.53.–j, 87.66.–a
机译：本文说明了在辐射治疗计划系统中，作为调试光子束模型过程的一部分，需要验证监视单元的计算的必要性。提供了一些示例，其中该验证在剂量模型或剂量算法的实施中识别出细微的错误。如果调试过程仅比较相对剂量分布，则不会检测到这些错误。建立了一组具有不同场大小，源到皮肤的距离，楔形和遮挡的光束配置，以验证在两个不同的放射治疗计划系统中两个不同光束模型的监测器单元计算。将使用治疗计划系统计算出的监测器单位与根据组织最大比值（TMR）表根据点剂量计算得出的监测器单位进行比较。当出现差异时，将分析剂量模型和代码以找出差异的原因。监控器单元计算中的差异既显着（高达5％），又是系统性的。对剂量计算软件的分析发现：（1）坐标系统转换错误，（2）剂量分布阵列处理不当，（3）调试软件和计划软件中剂量计算之间的差异，以及（4）建模方面的缺陷头部散落。在光束计算软件或数据集中进行了校正以克服这些差异。因此，我们建议在光子束调试过程中纳入对监视单元计算的验证。PACS编号：87.53.–j，87.66.–a

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