2004/05/20 by Bruno De Man, S. Basu, Samit Basu · 5 citations
Medicine · Engineering · Physics and Astronomy · #Medical Imaging Techniques and Applications #Advanced X-ray and CT Imaging #Advanced X-ray Imaging Techniques
paper · doi:10.1088/0031-9155/49/11/024
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.