三维锥束重建中滤波器的设计

Design of Filter in 3D Cone Beam Reconstruction

设计了几种用于CT三维锥束图像重建的滤波器,并将其对图像质量的影响进行了分析。CT是一种先进的成像技术,现已被应用于多个领域。CT图像重建算法多采用滤波反投影法,滤波是此方法的核心部分。本文介绍了三维锥束近似重建的基本原理,分析并设计了几种用于CT锥束图像重建的滤波器,并且通过投影数据的图像重建结果分析了不同滤波函数对断层图像重建质量的影响。实验结果证明:所设计的几种滤波器能较好的满足实际图像重建的要求。

This article analysises designes for several filters using in the approximate three-dimensional cone beam reconstruction principle,and analysises the effect of CT＇s image quality.CT is an advanced imaging technology,and have been used in many fields.The current CT image reconstruction alrorithms mostly use filtered back projection method.Filtering is the core of this method.This article analysises and designes for several filters using in the approximate three-dimensional cone beam reconstruction principle.It analysises the different filter functions affecting the quality of CT image reconstruction according to the results of the projection data＇s image reconstruction.These filters can be better to meet the requirements of the actual image reconstruction.