基于高密度子网格光线追迹的三维发射层析重建算法

3D emission computerized tomography reconstruction algorithm based on ray tracing of high-density subgrids

三维(three-dimensional,3D)发射层析技术(emission computerized tomography,ECT)是一种简单、高效且准确的燃烧场3D成像与检测技术,其中权重矩阵的计算精度决定了层析重建的精度和质量。本文研究了一种基于高密度子网格光线追迹的权重矩阵计算方法,将被测区域划分为密度更高的子网格,并根据相机成像模型实现光线追迹,以确定离散网格对投影像素的权重因子。数值模拟和燃烧火焰重建实验表明该算法具有较高的精度和计算效率。该研究对于3D发射层析技术的实用化具有重要的理论意义。

Three-dimensional(3D)emission computerized tomography(ECT)is a simple,efficient and accurate technology for 3D imaging and measuring of combustion field,in which the calculation accuracy of weight matrix determines the accuracy and quality of tomographic reconstruction.In this paper,a weight matrix calculation algorithm based on ray tracing of high-density subgrids is studied.The measured zone is divided into high-density subgrids,and ray tracing is performed according to the camera imaging model to determine the weight factors of discrete grid with projection pixels.Numerical simulation and reconstruction experiment for combustion flame prove that the algorithm has high accuracy and computational efficiency.The research has important theoretical reference for the practical application of 3D ECT.