论文标题
使用代数算法的2D,3D图像重建的均匀采样极性和圆柱网格方法
Uniformly Sampled Polar and Cylindrical Grid Approach for 2D, 3D Image Reconstruction using Algebraic Algorithm
论文作者
论文摘要
代数方法(AM)的图像重构在数据收集过程受时间,空间和辐射剂量约束的情况下优于转换方法。 AM算法也可以应用于不存在这些约束的情况下,但是在这种情况下,它们的高计算和存储要求禁止其实际突破。在目前的工作中,我们提出了一种新型的均匀采样极性/圆柱网格(USPG/USCG)离散化方案,以减少代数方法的计算和存储负担。 USPG/USCG的对称性用于加快投影系数的计算。此外,我们还为USPG提供了一种有效的方法,用于可视化的笛卡尔电网(CG)转换。乘法代数重建技术(MART)已用于确定所建议的网格的现场函数。已经执行了青蛙和Cu倾斜的实验预测数据,以验证所提出的方法。已经评估了各种图像质量度量,以检查重建的准确性。结果表明,当前策略(与基于CG的算法相比)重建过程加快了2.5倍,并通过因子P(重建中使用的投影数量)减少记忆要求。
Image reconstruction by Algebraic Methods (AM) outperforms the transform methods in situations where the data collection procedure is constrained by time, space, and radiation dose. AM algorithms can also be applied for the cases where these constraints are not present but their high computational and storage requirement prohibit their actual breakthrough in such cases. In the present work, we propose a novel Uniformly Sampled Polar/Cylindrical Grid (USPG/USCG) discretization scheme to reduce the computational and storage burden of algebraic methods. The symmetries of USPG/USCG are utilized to speed up the calculations of the projection coefficients. In addition, we also offer an efficient approach for USPG to Cartesian Grid (CG) transformation for the visualization. The Multiplicative Algebraic Reconstruction Technique (MART) has been used to determine the field function of the suggested grids. Experimental projections data of a frog and Cu-Lump have been exercised to validate the proposed approach. A variety of image quality measures have been evaluated to check the accuracy of the reconstruction. Results indicate that the current strategies speed up (when compared to CG-based algorithms) the reconstruction process by a factor of 2.5 and reduce the memory requirement by the factor p, the number of projections used in the reconstruction.