Department of Radiotherapy Physics, Northern Centre for Cancer Care, Freeman Hospital, Freeman Road, Newcastle upon Tyne NE7 7DN, UK.
RaySearch Laboratories AB, Stockholm, Sweden.
Phys Med. 2021 Feb;82:87-99. doi: 10.1016/j.ejmp.2021.02.002. Epub 2021 Feb 15.
This work compares Monte Carlo dose calculations performed using the RayStation treatment planning system against data measured on a Varian Truebeam linear accelerator with 6 MV and 10 MV FFF photon beams.
The dosimetric performance of the RayStation Monte Carlo calculations was evaluated in a variety of irradiation geometries employing homogeneous and heterogeneous phantoms. Profile and depth dose comparisons against measurement were carried out in relative mode using the gamma index as a quantitative measure of similarity within the central high dose regions.
The results demonstrate that the treatment planning system dose calculation engine agrees with measurement to within 2%/1 mm for more than 95% of the data points in the high dose regions for all test cases. A systematic underestimation was observed at the tail of the profile penumbra and out of field, with mean differences generally <0.5 mm or 1% of curve dose maximum respectively. Out of field agreement varied between evaluated beam models.
The RayStation implementation of photon Monte Carlo dose calculations show good agreement with measured data for the range of scenarios considered in this work and is deemed sufficiently accurate for introduction into clinical use.
本研究旨在比较使用 RayStation 治疗计划系统进行的蒙特卡罗剂量计算与瓦里安 Truebeam 直线加速器 6MV 和 10MVFFF 光子束的测量数据。
在各种照射几何形状下，使用均匀和非均匀体模对 RayStation 蒙特卡罗计算的剂量性能进行了评估。采用伽玛指数作为定量测量相似性的指标，在相对模式下对曲线进行了轮廓和深度剂量比较。
结果表明，对于所有测试案例，在高剂量区域内，超过 95%的数据点的治疗计划系统剂量计算引擎与测量值的偏差在 2%/1mm 以内。在曲线边缘的尾部和场域外观察到系统低估，平均差异分别小于 0.5mm 或曲线剂量最大值的 1%。场外的一致性因评估的射束模型而异。
在本研究考虑的范围内，光子蒙特卡罗剂量计算的 RayStation 实现与测量数据具有良好的一致性，并且被认为足够准确，可以引入临床使用。
