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 .
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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2004年第2期232-235,共4页
Acta Electronica Sinica
基金
国家自然科学基金 (No .69972 0 4 7
No .69931 0 1 0 )
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
convolution backprojection algorithm (CBP)
new filter
error estimation
time frequency character
local tomography
