摘要
针对含有噪声的投影数据,在利用螺旋锥束Katsevich算法进行重建的过程中,首先采用了一种改进的中值滤波方法对投影体数据进行预处理,然后对处理后的投影数据拟合求导来取代Katsevich算法中的直接求导,减小了噪声带来的负面影响。计算机仿真实验结果证实了这种方法的有效性。
The improved median filter is adopted to pretreat the projections which contain random noise and a Little abnormal noise.Then the derivative of the disposed projections is calculated with a fitting method instead of direct derivative one.This method reduces the negative effect coming from the noise.Computer simulation experiment proves the validity of this method.
出处
《计算机工程与应用》
CSCD
北大核心
2007年第26期187-189,226,共4页
Computer Engineering and Applications
基金
国家自然科学基金( the National Natural Science Foundation of China under Grant No60672098)
重庆市科技公关计划( the KeyTechnologies R&D Program of Chongqing City
China under Grant NoCSTC2006AB3027)
