Distance-driven projection and backprojection in three dimensions
Distance-driven projection and backprojection in three dimensions
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DOI：
10.1088/0031-9155/49/11/024
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发表时间：
2004-06-07
影响因子：
3.5
通讯作者：
Basu, S
中科院分区：
文献类型：
--
作者：
De Man, B;Basu, S
投影和反投影是断层成像中经常出现的操作。最近，我们提出了一种新的投影和反投影方法，我们称之为距离驱动，它提供低算术成本和高度顺序的内存访问模式。此外，距离驱动的投影和反投影避免了一些其他方法所特有的几种导致伪影的近似特征。我们之前已经演示了该方法在平行和扇形光束几何形状中的应用。在本文中，我们将距离驱动框架扩展到三个维度，并演示其在锥束重建中的应用。我们还提供了实验结果，以证明距离驱动方法在三个维度上的计算性能、伪像特征和噪声分辨率特征。
Projection and backprojection are operations that arise frequently in tomographic imaging. Recently, we proposed a new method for projection and backprojection, which we call distance-driven, and that offers low arithmetic cost and a highly sequential memory access pattern. Furthermore, distance-driven projection and backprojection avoid several artefact-inducing approximations characteristic of some other methods. We have previously demonstrated the application of this method to parallel and fan beam geometries. In this paper, we extend the distance-driven framework to three dimensions and demonstrate its application to cone beam reconstruction. We also present experimental results to demonstrate the computational performance, the artefact characteristics and the noise-resolution characteristics of the distance-driven method in three dimensions.