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核技术  2015 

具有加速因子的OSEM重建算法用于X射线荧光CT研究

DOI: 10.11889/j.0253-3219.2015.hjs.38.060201, PP. 60201-60201

Keywords: 同步辐射,X射线荧光CT,图像重建质量,有序子集最大期望值算法

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Abstract:

有序子集最大期望值算法(OrderedSubsetsExpectationMaximization,OSEM)具有较高的图像重建质量和较短的计算时间,已经被应用于内源CT(如SPECT、PET、同步辐射X射线荧光CT)的图像重建中。本文提出了一种具有加速因子的OSEM算法应用于X射线荧光CT的图像重建,通过引入加速因子h来调制校正因子的步长加快OSEM算法的收敛速度,研究了不同加速因子和不同子集数的AOSEM算法对重建图像质量的影响。计算机模拟及实验结果表明,在获得同等质量重建图像的同时,具有加速因子的OSEM算法的重建速度是常规OSEM的两倍。

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