【摘要】 目的:比较辐射自显影胶片、电子射野影像系统、电离室矩阵等不同探测器在多叶准直器质量保证中的定位精度。方法:采用辐射自显影胶片(GAFCHROMIC EBT胶片)、电子射野影像系统、电离室矩阵(IBA公司Matrixx和PTW公司Seven29)测量和比较瓦里安公司Clinac ix加速器的多叶准直器叶片的边缘的边响应函数,比较测量结果,评价不同探测器的定位精度。结果:四种探测器的定位精度均可达到0.1mm,其中电子射野影像系统的灵敏度最高。结论:上述探测器均能满足临床质控需要。更多还原

【Abstract】 Objects: To compare the positioning accuracy among GAFCHROMIC EBT film,Portal Vision and ionchamber 2D array in the MLC quality assurance.Method: Measuring the edge response function to each leaf for Varian IX Linac MLC,respectively with GAFCHROMIC EBT film,Portal Vision and ionchamber 2D array(MatriXX and Seven 29 each belongs to IBA and PTW),compare,and evaluate their positioning accuracy of each detector.Result: The position accuracy of each detector all reached to 0.1mm accuracy,the sensitivity of Portal Vision is the best.Conclusion: All detectors we used could meet the clinical needs for quality control for MLC positionning.更多还原