摘要
针对在FDK算法的反投影过程中,各个体素在探测器上投影分布的特点,本文提出一种新的插值方法。该方法根据体素投影的特点,采用在重建过程中,根据其在不同扫描角度下在各个探测器单元上的投影所占面积的加权和作为反投影值。实际实验结果表明,在FDK算法中这个新的插值方法比传统的插值方法(如:最近邻插值,双线性插值)重建出来的图像边缘清晰,而且能更好地抑制噪声。
In the back-projection process of the FDK algorithm, every voxel＇s project distribution in the detector have itself characteristics, This paper presents a new interpolation method. The voxel projection based on the characteristics used in the reconstruction process, According to its different scanning angle detector modules in all the occupied area of the projection of the size as the voxel -projection. Actual experimental results show that the FDK algorithm of this new interpolation method give an better result in the reconstructed image＇s verge than the traditional interpolation methods （such as replication interpolation, bilinear interpolation） , and this new interpolation method can restrain noise effect.
出处
《中国体视学与图像分析》
2007年第3期221-225,共5页
Chinese Journal of Stereology and Image Analysis
基金
国家自然基金(No.60532080)
关键词
体素
插值
FDK算法
voxel
interpolation
FDK algorithm
