CT系统的能谱估计及射束硬化校正算法  

Estimation of Energy Spectra of CT System And Beam-Hardening Correction Algorithm

作　　者：叶侠娟[1] 张朋[2] 

机构地区：[1]西北大学数学系,中国陕西710069 [2]北京信息工程学院应用数学研究室,中国北京100101

出　　处：《CT理论与应用研究（中英文）》2003年第2期10-15,共6页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金资助

摘　　要：本文给出对CT系统X射线能谱的估计算法和单成分被测物体CT成像的射束硬化校正算法,并给出和分析了数值模拟结果。The authors present an algorithm which can estimate, by means of a standard cylinder or wedge model, the energy spectra of the CT system and the mass attenuation coefficient of the model at the same time. An algorithm on beam-hardening correction of CT image for single material object is presented as well. The simulation results show that the algorithm for estimation of the energy spectra can give a reasonable estimation of the energy spectra, and that beam-hardening correction algorithm is more precise than polynomial approximation correction algorithm and more rapid than common iterative algorithm.

关 键 词：计算机层析成像 能谱估计 射束硬化校正 牛顿迭代法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]