CTX射线能谱滤过器的优化设计  

Optimized Design of X-ray Spectrum Filter for CT

作　　者：代秋声[1] 徐品[1] 邢晓曼[1] 

机构地区：[1]中国科学院苏州生物医学工程技术研究所,江苏苏州215163

出　　处：《CT理论与应用研究（中英文）》2011年第3期331-338,共8页Computerized Tomography Theory and Applications

摘　　要：采用蒙特卡罗方法对CTX射线能谱滤过器的优化设计进行了研究。使用EGSnrc软件对电子打靶产生X光子的物理过程和X光子穿过不同滤过器的物理过程进行了模拟,从信噪比的角度给出了优化设计的依据和计算公式。结果表明,滤过器设计存在最优化的设计参数,但是在不同的成像条件和成像要求下,其最优化参数是不同的,需要根据具体的条件来确定。The optimized design of X-ray spectrum filter for computed tomography is studied by Monte Carlomethod in this paper. The generation process of X-ray using electron bombardment metal target and the transportprocess of X-ray through different filters were simulated by EGSnrc software. The formula for optimized designwas presented on the basis of signal to noise ratio （SNR）. The results show that the optimal parameter for filterdesign exists, and it is different under different imaging conditions and requirements, which is determined by theactual conditions.

关 键 词：滤过器 信噪比 优化设计 

分 类 号：R812[医药卫生—放射医学]