BACKGROUND:Maximum likelihood expectation maximization (MLEM) algorithm,the classical algorithm in PET reconstruction,is superior to filtered back projection reconstruction with its better performance in resolution and noise characteristic.
背景:最大似然估计算法是正电子发射断层图像重建的经典算法,能够在信息量不足的情况下获得分辨率和噪声特性均优于滤波反投影重建的重建结果。
参考来源 - 一种基于指数型先验分布的正电子发射断层图像重建算法·2,447,543篇论文数据，部分数据来源于NoteExpress
Results show that the effect of projection noise on the reconstructed fields is represented by a slope function related to the filter used in deflection tomographic filtered back-projection algorithm.
因此提出了改进的偏折层析滤波反投影算法，数值模拟表明，改进算法在有效抑制倾斜现象的同时，对重建结果不会造成明显的失真。
In this paper, we propose a new algorithm based on sub-aperture and filtered back-projection algorithm to estimate the anisotropy of objects scattering centers in wide-aperture imaging.
介绍了由投影重建图像的基本原理，对扇束滤波反投影重建算法进行了分析，并针对该算法的特点提出了一种提高算法求解速度的方法。
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