摘要
针对通常工业CT转台特点,提出了一种新的基于扇束等距采样的超分辨CT扫描模式和相应的重建算法。分别向左和右偏移CT旋转中心1/4探测器宽度,得到的两组相叠采样的投影数据。通过求解一组具有双对角矩阵的线性方程组,得到高分辨的CT虚拟投影数据,进而由扇束滤波反投影算法重建出高分辨的CT图像。数值模拟结果验证了本文方法的有效性。
In this paper, we design a novel scanning mode based on fan beam equidistant sampling and propose a corresponding image reconstruction method for super-resolution CT, according to the common industrial CT scanning geometry. From the two sets of overlapped low resolution fan beam projection data acquired by switching the rotation center of CT system near a quarter of the detector width to left and right sides respectively, we can demodulate a virtual high resolution projection data by solving linear equations with bidiagonal coefficient matrix, and then reconstruct high resolution CT image by the fan beam FBP algorithm. The simulation results verify the validity of our method.
出处
《中国体视学与图像分析》
2005年第3期154-157,共4页
Chinese Journal of Stereology and Image Analysis
基金
国家自然科学基金(60472071)
北京市自然科学基金(4051002)资助项目
关键词
CT
超分辨
相叠采样
低分辨数据
图像重建
computer tomography
super resolution
overlapped sampling
low resolution projection data
image reconstruction
