【摘 要】
：
传统的射束硬化校正方法,通常需要针对每一种材料测量该材料对射线的吸收曲线．由于吸收曲线对实验条件有很大的依赖性,每当改变X光机电压或者被测工件的材料等条件时,需要重新
【机 构】
：
中国科学院高能物理研究所,中国科学院高能物理研究所,中国科学院高能物理研究所 北京 100049,北京 100049,北京 100049
论文部分内容阅读
传统的射束硬化校正方法,通常需要针对每一种材料测量该材料对射线的吸收曲线．由于吸收曲线对实验条件有很大的依赖性,每当改变X光机电压或者被测工件的材料等条件时,需要重新测量吸收曲线才能完成硬化校正过程．这种方法费事费时．本文提出了基于蒙特卡罗模拟计算物质吸收曲线的硬化校正方法．实验中,分别用本方法和传统的硬化校正方法对铝工件进行硬化校正,经过比较,确认本方法是有效的．然后用该方法对不同材料(铝、铁和铜)的工件进行校正．实验结果表明,本方法能有效消除各种材料工件图像中的硬化伪影,是快速的和切实可行的．
Conventional beam hardening correction methods often require measuring the material’s absorption curve for each material. As the absorption curve of the experimental conditions have a great dependence, whenever you change the X-ray machine voltage or the workpiece material and other conditions, the need to re-measure the absorption curve to complete the hardening correction process. This method takes time and effort. In this paper, a hardening correction method based on Monte Carlo simulation of material absorption curve is proposed. In this experiment, the method of this method and the traditional method of hardening correction were used to harden the aluminum workpiece. After comparison, the method was proved to be effective. This method is then used to correct workpieces of different materials (aluminum, iron and copper). The experimental results show that this method can effectively eliminate the hardening artifacts in the images of various materials and is fast and practical.
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