光学投影层析的快速图像重建和影响因素分析

Rapid Implementation of Filtered Back-Projection and Analysis of Influencing Factors on Image Reconstruction in Optical Projection Tomography

介绍了光学投影层析(Optical Projection Tomography,OPT)图像重建中的滤波反投影(Filtered Back-projection,FBP)算法,针对该算法中运算量最大的射束运算,提出了利用像素点坐标对称性来减少运算量的FBP快速实现方法,可使重建时间缩短约15%.并对影响图像重建质量的投影角数目、旋转台步进精度、CCD中心像素偏离等因素进行了分析,得出的结论对OPT系统设计具有重要参考价值.

The filtered back-projection （FBP） algorithm was introduced to implement optical projection tomography （OPT） image reconstruction. A rapid algorithm based on pixel coordinate symmetry was proposed to reduce the beam operation time which dominated the FBP calculation time. About 15% of time reduction can be obtained by using our algorithm. The factors that affect on the image reconstruction quality,such as the number of projection orientations, the step precision of the rotating stage, and the deviation of the center pixel of CCD were analyzed. The results show great potential for OPT.