Unmatched projector/backprojector pair for demultiplexing in multipinhole emission computed tomography
Unmatched projector/backprojector pair for demultiplexing in multipinhole emission computed tomography
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DOI：
10.1117/1.3518081
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发表时间：
2010-12-01
影响因子：
1.3
通讯作者：
Joung, Jinhun
中科院分区：
文献类型：
--
作者：
Min, Byung Jun;Choi, Yong;Joung, Jinhun
基于统计的迭代算法，如最大似然期望最大化（ML-EM）用于单光子发射计算机断层扫描（SPECT）中的图像重建。不匹配的投影仪/反投影仪对有时用于加速重建算法中的迭代过程。在这项工作中，我们提出并探讨使用一个不匹配的投影机/背投对多针孔SPECT解复用。几个模拟进行评估所提出的方法与均匀，热棒，冷棒幻影的性能。所提出的方法采用了一个不匹配的反投影仪，利用选择性多路复用的投影数据重建算法，而投影仪建模尽可能准确地代表现实的成像几何形状和多针孔SPECT的物理效果。均方根（rms）误差和反投影速度进行评估，以确定一个不匹配的反投影。我们的研究结果表明，所提出的方法提供了高质量的多针孔SPECT图像，没有多路复用相关的文物时，精心挑选的不匹配的反投影仪使用。(C)2010年，美国光学仪器工程师学会（Society of Photo-Optical Instrumentation Engineers）[DOI 10.1117/1.3518081]
Statistically based iterative algorithms such as maximum likelihood-expectation maximization (ML-EM) are used for image reconstruction in single photon emission computed tomography (SPECT). Unmatched projector/backprojector pairs are sometimes used to accelerate the iteration process in the reconstruction algorithm. In this work, we propose and explore the use of an unmatched projector/backprojector pair for demultiplexing in multipinhole SPECT. Several simulations are conducted to evaluate the performance of the proposed method with uniform, hot-rod, and cold-rod phantoms. The proposed method incorporates an unmatched backprojector to utilize selective multiplexed projection data in reconstruction algorithms, while the projector is modeled as accurately as possible to represent realistic imaging geometry and the physical effects of multipinhole SPECT. The root mean square (rms) error and backprojection speed are evaluated to determine an unmatched backprojector. Our results demonstrate that the proposed method provides high-quality multipinhole SPECT images without multiplexing-related artifacts when a well-chosen unmatched backprojector is used. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3518081]