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关于CBP算法的一种新型滤波函数和它的性质
A New Filter Function in CBP and Its Properties
【摘要】 用卷积反投影 (CBP)算法作CT重建 ,滤波函数是关键 .本文建议一种新型滤波函数 ,给出了用它作CT重建的误差估计 ,分析了该滤波函数的时频特性 ,并用来作局部重建 .模拟和实测数据的数字实验表明其在保证空间分辨率的同时能较好地克服Gibbs效应
【Abstract】 Filter function is the key point of CT convolution backprojection.This paper suggests a new filter function and gives the estimates of CBP,and the analysis of the time frequency character.By the filter,Local tomography is implemented.The reconstruction results of simulation and experimental projection data show that this filter can improve Gibbs effects without decreasing the resolution of the images.
【关键词】 卷积反投影(CBP)算法;
新滤波函数;
误差分析;
时频特性;
局部重建;
【Key words】 convolution backprojection algorithm (CBP); new filter; error estimation; time frequency character; local tomography;
【Key words】 convolution backprojection algorithm (CBP); new filter; error estimation; time frequency character; local tomography;
【基金】 国家自然科学基金 (No .69972 0 4 7;No .69931 0 1 0 )
- 【文献出处】 电子学报 ,Acta Electronica Sinica , 编辑部邮箱 ,2004年02期
- 【分类号】TN713
- 【被引频次】20
- 【下载频次】196