Abstract
Photon interaction cross sections for a few biological materials are calculated at 60 keV using non-relativistic form factors and the incoherent scattering function approximation. Compton, Rayleigh and total scattering cross sections were estimated in the momentum transfer region 0 to 5A 0-1 for simulation and compilation purposes. Rayleigh scattering cross sections for water are estimated using the molecular form factors of Morin at low photon energies. Computed tomographic images of a few soft materials are obtained using a tomographic system based on an image intensifier. It consists of a charged 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. X-ray imaging is a well established technique of detecting strongly attenuating materials as distinguished from weakly attenuating materials. The image contrast between the weakly attenuating materials can be enhanced by optimum selection of the X-ray energy and improving the spatial resolution.
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