摘要
在CT图像重建算法研究和比较过程中,第一步工作就是获取投影数据。本文提出了一种通过离散数据获取投影的新方法。首先将射线等分,利用邻近插值获取每等分段两个端点及中点的密度;再利用Simpson公式求得每段的积分值,最后累加所有等分的积分值即可获得整条射线的投影。模拟实验获得了很好的结果,表明以之用以图像重建算法的研究是可行的。
The projection acquisition is the first step in the research and comparison of CT image reconstruction algorithm. The paper provides a new method of projection simulation through discrete data. Firstly, we divide the projection line into equidistant pieces, and the nearest neighbor interpolation is used to achieve two end points and center densities of each piece; Secondly, we get each piece integration using Simpson＇s formula; Finally, we acquire a linear projection data by summing up all pieces＇ integrations. The experiment effect is satisfactory, and results show the projections which are acquired with discrete method are feasible for the study of image reconstruction algorithm.
出处
《微计算机信息》
北大核心
2006年第07S期195-196,215,共3页
Control & Automation
基金
上海市教委发展基金(217433)
上海市宝山区科委基金(04-E-5)
关键词
图像重建
投影
模拟
插值
离散
image reconstruction,projection,simulation,interpolation,dlscrete
