Computed tomography with image intensifier: imaging and characterization of materials

Computed tomographic images, nondestructive evaluation of materials of ceramics, electrical insulators, wood and other samples obtained, using a new tomographic system based on an image intensifier replacing earlier system (Cesareo et al., Nucl. Instr. and Meth. A 356 (1995) 573). It consists of a charge coupled device camera and an acquisition board. The charge coupled device and the acquisition board allows image processing, filtration and restoration. A reconstruction programme, written in PASCAL is able to give the reconstruction matrix of the linear attenuation coefficients, and simulates the matrix and the related tomography. The flux emitted by the tube is filtered 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 image quality.