High quality reconstruction for neutron computerized tomography images

Abstract

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.

Keywords

• NCT
• Image reconstruction
• IRT
• Data duplication
• Poor contrast