IEEE Trans Med Imaging. 2014 Apr;33(4):970-8. doi: 10.1109/TMI.2014.2300932.
This paper proposes the application of multiple importance sampling in fully 3-D positron emission tomography to speed up the iterative reconstruction process. The proposed method combines the results of lines of responses (LOR) driven and voxel driven projections keeping their advantages, like importance sampling, performance and parallel execution on graphics processing units. Voxel driven methods can focus on point like features while LOR driven approaches are efficient in reconstructing homogeneous regions. The theoretical basis of the combination is the application of the mixture of the samples generated by the individual importance sampling methods, emphasizing a particular method where it is better than others. The proposed algorithms are built into the Tera-tomo system.
本文提出了在完全三维正电子发射断层成像中应用多重重要抽样，以加快迭代重建过程。所提出的方法结合了线响应（LOR）驱动和体素驱动投影的结果，保持了它们的优点，如重要抽样、性能和在图形处理单元上的并行执行。体素驱动方法可以专注于点状特征，而 LOR 驱动方法在重建均匀区域方面效率较高。组合的理论基础是应用各个重要抽样方法生成的样本的混合，强调在其他方法更好的情况下使用特定的方法。所提出的算法被构建到 Tera-tomo 系统中。
