Development of a simulator for tomographic images generated by radiation transmission

AUTOR(ES)

Almeida, Gevaldo L. de, Silvani, Maria Ines, Furieri, Rosanne C. A. A., Gonçalves, Marcelo J., Lopes, Ricardo T.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2004-09

RESUMO

A computer program to simulate tomographic images generated by transmitted radiation was developed. The algorithm uses a deterministic approach to generate the projections, which supply an existing image reconstruction software. A dispersion associated with the counting statistics is also incorporated into the algorithm, in order to simulate the influence of the detector efficiency and counting time on the final image quality. The detector resolution is also included in the algorithm by assuming a gaussian shape for its line spread function - LSF. The program deals with cylindrical objects containing any desired number of cylindrical rods inside and requires their positions, dimensions and attenuation properties as input data. Images of such objects, acquired with a thermal neutron tomograph equipped with a position sensitive detector, have been compared with those simulated by the developed program in order to evaluate its ability to reproduce those images.

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