The purpose of this paper is to introduce and study a multi-narrow beam X-ray Luminescence Computed Tomography (XLCT) system based on a simple coded aperture. The proposed XLCT system is studied through simulations of x rays and diffuse light propagation and the implementation of the multi-narrow beam XLCT reconstruction algorithm. The relationship between the reconstructed quality of the XLCT image and the pass-element distribution of the coded aperture mask is investigated. The coded aperture that produces the best image quality metrics for the numerical phantom is selected for the XLCT system. The effects of detection positions and the number of projection angles are also investigated for considering the scanning efficiency and system structural complexity. The results demonstrate that the proposed multi-narrow beam XLCT system is competent in resolving targets with high complexity when comparing with the coded aperture compressed sensing XLCT system based on a complicated mask. It can also offer an enhancement in scanning efficiency in comparison with the conventional multi-narrow beam XLCT system.

中文翻译：

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基于简单编码孔径的多窄束 X 射线发光计算机断层扫描系统的研究

本文的目的是介绍和研究一种基于简单编码孔径的多窄束X射线发光计算机断层扫描（XLCT）系统。通过模拟 x 射线和漫射光传播以及多窄光束 XLCT 重建算法的实现，研究了所提出的 XLCT 系统。研究了XLCT图像的重建质量与编码孔径掩模的通元素分布之间的关系。XLCT 系统选择了为数值模型产生最佳图像质量指标的编码孔径。考虑到扫描效率和系统结构复杂性，还研究了检测位置和投影角数量的影响。结果表明，与基于复杂掩模的编码孔径压缩传感 XLCT 系统相比，所提出的多窄波束 XLCT 系统能够解决高复杂度目标。与传统的多窄束 XLCT 系统相比，它还可以提高扫描效率。