Minitomografo de raio-X e raio-gama computadorizado para aplicações multidisciplinares

AUTOR(ES)
DATA DE PUBLICAÇÃO

1987

RESUMO

The main result of this thesis is the development, implementation and use of an X-ray and y-ray computerized minitomography scanner with possible applications in multidisciplinary fields particularly in soil physics. The hardware is basically a mechanical table with two step motors, one for rotation and another for translation motions, radioactive,source, collimators, radiation detector with NaI(Te) chrystal, electronic pulse handling system and microcomputer with two floppy disk-units (5 1/4"), video with high resolution and graphic printer. Using the concept of Contrast Transfer Function (CTF) we obtained quantitative information on the spatial resolution and image quality of the system. This study using a y-ray source (241Am) demostrates that the images obtained with pixel widths of 1mm and photon beam radii of 1,2mm have good quality as evaluated quantitatively by the CTF. On the other hand, results with a total of 10000 photons counts showed adequate image, contrast The computational programs were all developed in Pascal language. They are used respectively for control and data collection (MTACCON), image reconstruction with filtered backprojection algorithms (MTACREC) and to show in the video the slice with possibility of quantitative analysis of the linear attenuation coefficient at any chosen region (MTACSEC)...Note: The complete abstract is available with the full electronic digital thesis or dissertations

ASSUNTO(S)

automação maquinas agricolas

ACESSO AO ARTIGO

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