【摘要】 高能X射线工业CT探测器系统的能谱响应是一重要的特性参数。用实验方法测定探测器的能谱响应曲线存在很多困难。本工作利用Monte-Carlo模拟程序计算了CdWO4探测器模块的能谱响应曲线,分析了9 MeV驻波电子直线加速器X射线束的能量、剂量角分布以及X射线束能谱硬化对探测器模块探测效率的影响,为线阵探测器系统的一致性校正、非线性校正等提供了理论计算参数,并应用于工业CT图像校正,取得了满意的效果。更多还原

【Abstract】 The energy spectrum response is important characteristic for X-ray ICT detector.But there exist many difficulties to measure these parameters by experiments.The energy spectrum response of CdWO₄ detector was simulated by using the EGSnrc code.Meanwhile the effect of detection efficiency was analyzed by the distribution of accelerator bremsstrahlung spectra and the X-ray spectrum hardening,and some theoretic parameters were offered for the consistent and no-linearity correction of detector arrays.It was applied to ICT image correction,and a satisfying result was obtained.更多还原