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论文类型：会议论文

发表时间：2005-12-01

页面范围：7

关键字：Cone-beam reconstruction; Filtering direction; Circular trajectory; Nuating line.

摘要：Traditionally, the filtering direction of projection data is along the horizontal lines of the detector plane for the FDK algorithm, which makes it impossible that the same voxels involved in the filtering at one projection angle also are filtered together at the other projection angles. To keep filtering together as much as possible for the same voxels at different projection angle, a cone beam algorithm is presented based on Nutating Lines by modifying a result due to Turbell. Unlike Turbell's method, our algorithm avoids the process of rebinning the cone-beam data to 3D parallel-beam data. To deliver a better-reconstructed image quality, another FBP term developed by Hu is also modified into the final formula. The performance of the proposed algorithm is compared with other related algorithms through computer simulation using Shepp-Logan phantom, showing that the proposed algorithm can substantially compensate for the density drop inherent to the FDK-type algorithm.