An FBP-type reconstruction method for CBCT with significantly displaced detector

Li Zhang, Dufan Wu
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引用次数: 1

Abstract

In conebeam CT (CBCT), detector displacement is an efficient way to enlarge the field of view (FOV). When the displacement is severe, existing analytical methods will suffer artifacts induced by insufficient sampling. In this work, pre-weighting, post-weighting and Katsevich-type filter backprojection (FBP) as well as backprojection filtration (BPF) methods are investigated for the reconstruction task in dental CBCT. A simple but efficient continuity correction method is proposed for the post-weighting and Katsevich-type FBP. During the padding step, the conjugated projection is scaled by a factor to keep the padded projection continuous. The improved FBP-type algorithm greatly reduced the artifacts brought by the detector displacement. Simulation data and clinical dental CBCT data are used to verify the proposed procedure.
具有明显位移检测器的CBCT fbp型重建方法
在锥束CT (CBCT)中,探测器位移是扩大视场的一种有效方法。当位移严重时,现有的分析方法会因采样不足而产生伪影。在本研究中,研究了预加权、后加权和katsevich型滤波反投影(FBP)以及反投影滤波(BPF)方法用于牙科CBCT的重建任务。提出了一种简单有效的后加权和katsevich型FBP连续校正方法。在填充步骤中,共轭投影按一个因子缩放以保持填充投影连续。改进的fbp型算法大大降低了探测器位移带来的伪影。模拟数据和临床牙科CBCT数据被用来验证所提出的程序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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