多层CT重建算法对比研究

目前多层CT的重建算法主要有基于FDK的三维滤波反投影算法以及基于多层投影数据重排的二维FBP重建算法。本文对传统的FDK算法、基于投影角度二维/三维加权的CB-FBP算法以及自适应轴向插值AAI-FBP算法的性能进行了对比实验,并对实验数据进行了细致地分析。实验结果表明:在这几种重建算法中,AAI-FBP算法对于多层CT的重建效果最好,这对于后续多层CT重建算法的改进以及临床应用研究提供了可靠的实验依据。

Comparative Analysis of Reconstruction Algorithms for Multi-slice Clinical CT

Currently, there are major Feldkamp-Davis-Kress (FDK) based three dimensional filtered back projection (FBP) algorithms and fan-to-parallel rebinning followed by two dimensional FBP algorithms for multi-slice clinical CT reconstruction. This paper compared four different reconstruction algorithms, including conventional FDK algorithm, two-dimensional-weighted cone beam filtered back projection (CB-FBP) algorithm, three-dimensional-weighted CB-FBP algorithm and adaptive axial interpolator (AAI-FBP) algorithm. We performed a experiment on simulated helical projection data of Shepp-Logan phantom. After that, a detailed comparative performance analysis of the four algorithms is given. Conclusion:we find that AAI-FBP might be the optimal choice for conventional multi-slice clinical CT reconstruction. We hope this paper could be helpful for the improvement of multi-slice CT reconstruction algorithm as well as clinical application research.