CT理论与应用研究2013，Vol.22Issue(1)：85-92,8.
CT图像重建中滤波函数的优化
Optimization of Filter Function in CT Image Reconstruction
摘要
Abstract
FBP is the most popular analytical algorithm used to reconstruct image in CT system. The filtering process before back projection plays an important role relate to the image reconstruction quality. Usually the filtering function is acquired by Ramp function multiplying a rectangular window; however the ideal rectangular window will lead to a rough reconstruction result because of Gibbs artifact. According to the theory of infinite series, the arithmetic average named Fejer-core can be abstained after the function is expanded to the form of part sum. The core function has superiority convergence property. So to avoid Gibbs phenomena, the paper advances an improvement filtering method .Experiment result shows that Gibbs is avoided when convolve the filtered projections with Fejer-core. So smooth image can be obtained.关键词
CT图像重建/FBP算法/滤波/Gibbs现象/费耶核Key words
CT image reconstruction/FBP algorithm/filter/Gibbs/fejer-core分类
信息技术与安全科学引用本文复制引用
胡君杰,马晨欣,闫镔..CT图像重建中滤波函数的优化[J].CT理论与应用研究,2013,22(1):85-92,8.
