A backprojection-filtration algorithm for nonstandard spiral cone-beam CT with an n-PI-window
A backprojection-filtration algorithm for nonstandard spiral cone-beam CT with an n-PI-window
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DOI：
10.1088/0031-9155/50/9/012
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发表时间：
2005-05-07
影响因子：
3.5
通讯作者：
Wang, G
中科院分区：
文献类型：
--
作者：
Yu, HY;Ye, YB;Wang, G
对于团注追踪计算机断层扫描（CT）血管造影术和电子束微型CT的应用，Ye等人最近推广了Zou和Pan开发的反向投影-滤波（BPF）公式，用于从沿沿着相当灵活的扫描轨迹（包括非标准螺旋）收集的锥束数据重建图像。广义BPF公式的一个主要含义是，它可以应用于非标准螺旋扫描情况下的基于n-PI窗口的重建。在本文中，我们设计了一个基于n-PI窗口的BPF算法，并报告了3D Shepp-Logan体模和Defrise圆盘体模的数值模拟结果。该算法包括三个步骤：锥束数据微分，加权反投影和逆希尔伯特滤波。仿真结果验证了该算法的可行性和优越性。
For applications in bolus-chasing computed tomography (CT) angiography and electron-beam micro-CT, the backprojection-filtration (BPF) formula developed by Zou and Pan was recently generalized by Ye et al to reconstruct images from cone-beam data collected along a rather flexible scanning locus, including a nonstandard spiral. A major implication of the generalized BPF formula is that it can be applied for n-PI-window-based reconstruction in the nonstandard spiral scanning case. In this paper, we design an n-PI-window-based BPF algorithm, and report the numerical simulation results with the 3D Shepp-Logan phantom and Defrise disk phantom. The proposed BPF algorithm consists of three steps: cone-beam data differentiation, weighted backprojection and inverse Hilbert filtration. Our simulated results demonstrate the feasibility and merits of the proposed algorithm.