基于三投影方向的层析重建分析

针对传统的层析方法中,投影方向多、系统复杂等特点,提出了基于三个投影方向的层析重建方法.论文选取适用于少投影方向的代数迭代重建算法,采用参量修正方法,能较好的提高重建准确度和抑制椒盐噪音.同时对影响重建图像质量和速度的迭代次数、不同原图像结构对重建图像质量的影响进行了分析,给出了相应分析模拟结果.结果表明,迭代300次后,重建结果基本稳定.同时对于具有轴对称结构物体,三个方向投影数据能够较好地实现三维层析重建.分析结果为后期开展的基于单幅层析全息图的三维层析重建实验研究提供了理论依据.

Analysis of Tomography Reconstruction Based on Three Projections

In order to overcome some disadvantages of the conventional computer tomography,such as multiple projection directions,complicated systems,the tomography reconstruction based on three projection directions is proposed.Algebraic Reconstruction Algorithm suitable for fewer views is selected and its revised method which can well improve reconstruction precision and restrain salt-pepper noise is applied.The iteration numbers impacting on image quality and velocity and the impact that different shapes of original images on the reconstruction image quality are analyzed and discussed.The simulation results are presented,which show that the stable reconstruction can be gotten after 300 iteration numbers,tomography reconstruction based on three projections can be well realized for the axis-symmetric objects.The analysis results can provide some theory instruction for the further work on digital holographic tomography based on three projections.