This paper presents a modified Neutron Computerized Tomography reconstruction method for solving three main problems facing the Inverse Radon Transform based reconstruction method. The three problems are poor contrast of the reconstructed slice, the duplication of slice and the error in the center of rotation position in the images. The paper aims to solve all of these problems automatically without user intervention and during the acquisition phase in order to obtain immediate clear noise free high-quality reconstruction. The proposed method did not use any special filters in all its phases except the two basic filters, the median filter in normalization phase and one kind from the five filters that used in filtered back-projection step. Six samples have been studied taken in different rotations 180° and 36b° with different equiangular steps, different exposure times and different reactor power to prove high quality of reconstructed slice under these parameters. The practical work has been carried out in the Neutron Computerized Tomography facility at the Egyptian Second Research Reactor. The resulted reconstructed images showed that a high-quality image has been obtained comparable to the existing classical reconstruction method without losing any information.

本文提出了一种改进的中子层析成像重建方法，用于解决基于逆facing变换的重建方法面临的三个主要问题。这三个问题是重建切片的对比度差，切片重复以及图像中旋转中心位置的误差。本文旨在自动解决所有这些问题，而无需用户干预，并且在采集阶段，以便立即获得清晰无噪的高质量重构。所提出的方法在其所有阶段都没有使用任何特殊的过滤器，除了两个基本过滤器，归一化阶段的中值过滤器以及用于过滤反投影步骤的五个过滤器中的一种。研究了六个样品，以不同的等角步幅在180°和36b°的不同旋转下拍摄，在这些参数下，不同的暴露时间和不同的反应堆功率可证明高质量的切片。实际工作已在埃及第二研究堆的中子计算机断层扫描设备中进行。所得的重建图像表明，可以获得与现有经典重建方法相当的高质量图像，而不会丢失任何信息。