摘要
改进的光学CT扫描测量方法利用扫描线与平行于两坐标轴的平行线束交点坐标,快速精确计算出扫描线穿过每个像素格子的长度。在FSART(频谱分析图像重建)算法中,使用此长度可以精确地得到原始图像的投影向量,为后续重建图像更快更准地逼近原始图像打下坚实的基础。计算机仿真结果表明,该方法可以降低图像函数二维傅里叶级数展开的阶数即加快计算速度,重建的精度也有一定的提高。
The scanning measurement in optical CT calculates the length of ray across the pixel rapidly and accurately by using the coordinate intersected by the ray and the parallel to the reference frame.In frequency spectrum analysis for image reconstruction,this length is used to compute the projection vector of the original image,and afterwards,establish the firm ground for the reconstruction image approaching the original image.The computer simulation shows that this measurement speeds up the reconstruction by reducing the 2-D Fourier series and improves the precision.
出处
《计算机工程与应用》
CSCD
北大核心
2008年第28期193-195,共3页
Computer Engineering and Applications
基金
国家自然科学基金No.69878007~~
关键词
CT扫描
频谱分析
图像重建
投影向量
傅里叶级数
Computerized Tomography scanning
frequency spectrum analysis
image reconstruction
projection vector
Fourier series
