Computed tomography with image intensifier: imaging and characterization of materials

Computed tomographic images, nondestructive evaluation of materials of cera mics, electrical insulators, wood and other samples obtained using a new to mographic system based on an image intensifier replacing earlier system (Ce sareo et al,, Nucl. Instr, and Meth. A 356 (1995) 573). It consists of a ch arge coupled device camera and an acquisition board. The charge coupled dev ice and the acquisition board allows image processing, filtration and resto ration. A reconstruction programme, written in PASCAL is able to give the r econstruction matrix of the linear attenuation coefficients, and simulates the matrix and the related tomography. The flux emitted by the tube is filt ered using appropriate filters at chosen energy and reasonable monochromacy is achieved for all the images. The effect of collimators is also studied at various energies with filters and the optimum value is used for better i mage quality. (C) 1999 Elsevier Science B.V. All rights reserved.