PROJECTION SPACE ITERATION RECONSTRUCTION REPROJECTION
PROJECTION SPACE ITERATION RECONSTRUCTION REPROJECTION
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DOI：
10.1109/tmi.1985.4307712
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发表时间：
1985-01-01
影响因子：
10.6
通讯作者：
CHO, ZH
中科院分区：
文献类型：
--
作者：
KIM, JH;KWAK, KY;CHO, ZH
最近，有人建议将迭代重建-重投影（IRR）算法应用于有限视图计算机断层扫描（CT）。在IRR中，插值操作是在反投影-重投影期间在对象空间中执行的。与插值相关的误差会降低重建图像的质量，并且可能导致发散，除非使用大量光线。在本文中，我们提出了一种基于投影空间中的反投影-重投影的投影空间迭代重建-重投影（PSIRR）算法。在反投影-重投影过程中，用单个方程而不是多个方程进行迭代，并且消除了插值。给出了计算机仿真结果，PSIRR 算法的图像质量比原始 IRR 算法有了实质性的改进。此外，新算法还应用于使用海绵体模的超声衰减CT。
Recently, an iterative reconstruction-reprojection (IRR) algorithm has been suggested for application to limited view computed tomography (CT). In the IRR, the interpolation operation is performed in the object space during backprojection-reprojection. The errors associated with the interpolation degrade the reconstructed image and may cause divergence unless a large number of rays is used. In this paper, we propose a projection space iterative reconstruction-reprojection (PSIRR) algorithm based on backprojection-reprojection in the projection space. In the process of the backprojection-reprojection, iteration is performed with a single equation instead of multiple equations and interpolation is eliminated. Computer simulation results are presented, and image quality of the PSIRR algorithm shows a substantial improvement compared to the original IRR algorithm. In addition, the new algorithm was applied to ultrasonic attenuation CT using a sponge phantom.