二维矩阵电离室验证Acuros BV算法计算相对剂量分布的可行性研究

Feasibility study of using two dimensional array ion-chamber to verifiy relative dose distribution calculated with Acuros BV

目的研究PTW729二维矩阵电离室验证Acuros BV算法在相对剂量分布计算方法的可行性,分析该方法的优势和劣势,为实际临床工作提供参考。方法基于自建测量模体,在相同计划和测量条件下,使用PTW729和胶片方法,分别测试相同位置处的剂量分布,对两种方法的测量结果和Acuros BV算法计算结果分别进行γ比对分析,并测试PTW729方法的稳定性。结果PTW729和胶片的测试结果与Acuros BV算法计算结果的γ比对值分别为98.9%、95.9%,PTW729与胶片测试结果的γ比对值为88.0%。PTW729稳定性测试实验γ比对值分别为95.0%、100.0%、100.0%。结论PTW729二维矩阵电离室可应用于Acuros BV算法相对剂量分布的快速验证。

Objective To study the feasibility of using the PTW7292D array ion-chamber to verify the relative dose distribution calculated with the Acuros BV algorithm.Both advantages and disadvantages of the method were analyzed to provide reference for practical clinical practices.Methods Based on self-built measurement phantoms,the dose distribution on the same slice of the phantom was measured with PTW729 and film,respectively,under the same measurement condition and plan.The dose distributions obtained by the two method were compared with the result calculated with Acuros BV,separately,by usingγanalytical tool.And the stability of the PTW729 was tested.Results Theγcomparison value was 95.9%between the film and Acuros BV,98.9%between the PTW729 and Acuros BV and 88.0%between the film and PTW729,with 95.0%,100.0%,and 100.0%,in their stability test respectively.Conclusions PTW7292D array ion-chamber can be applied to the rapid verification of Acuros BV algorithm-calculated relative dose distribution.