摘要
由投影重建图像的迭代算法有抑制噪声等优点,但其投影矩阵的计算量大、影响重建速度。该文利用投影线存在的几何对称结构,引入图像重建的对称块迭代算法(简写为SB-IRT),简化了投影矩阵系数的计算,调整了迭代算法的顺序相关性。对于模拟和实测数据进行了图像重建试验,结果表明:与常规算法比较,该文提出的对称块迭代算法重建速度快,重建图像精度高。
With a method of series expansion for image reconstruction, there exists great difficulties in terms of slow reconstruction due to bulk data to deal with. This paper presents the symmetric structure of projection lines for image reconstruction and provides a simplified algorithm for the coefficients of projection matrix via this symmetric structure, thereby an ad hoc method of fast Symmetric Block-Iterative Reconstruction Technique （SB-IRT） is introduced to solve the image reconstruction problem. The experimental image reconstruction utilizing the symmetric block-iterative algorithm with both simulated and experimental projection data is undertaken. In comparison with the performance of other conventional algorithms, the results show that the image reconstruction using the presented algorithm is much faster, and the reconstruction images has much better precision than the others.
出处
《电子与信息学报》
EI
CSCD
北大核心
2007年第10期2296-2300,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60572103)
北京市教育委员会科技发展计划(K200310772129)资助课题
关键词
图像重建
对称块迭代
变换群
Image reconstruction
Symmetric block-iterative
Transformation group
