适用于SR-CT技术的新算法

SR-CT(Synchrotron Radiation Computed Tomography)技术中有多种重建算法,其典型算法有滤波反投影算法和迭代算法,这两类算法各有其特点。综合考虑重建结果的质量和重建运算的时间,本文提出了一种新的算法混合算法。通过不同算法重建图像的分析比较,结果表明混合算法包含了前两类算法的优点,而且避免了它们的缺点,是一种行之有效的算法。同时对混合算法中的一些重要参数如初始解系数、迭代步长也进行了详细讨论,并给出了这些参数对重建图像质量的影响关系。

A New Arithmetic of SR-CT Technique

In the technique of synchrotron radiation computed tomography(SR-CT),the filterd backprojection arithmetic and the iterative arithmetic are very typical two sorts of arithmetic.And their advantages and disadvantages are different clearly.In order to improve the quality of reconstruction images and reduce the computational time for SR-CT technique,a new arithmetic named mixed arithmetic is proposed in this paper.The reconstruction images acquired by the three sorts of arithmetic were compared and analyzed.The results indicate that the quality of reconstruction images from the mixed arithmetic is best.The mixed arithmetic not only includes the advantages of the filterd backprojection arithmetic and the iterative arithmetic,but also avoids their disadvantages.The important parameters in the mixed arithmetic such as the initial solution coefficient and the size of iterative step are also discussed in detail.And the relationship between reconstruction images quality and the two parameters above are given.