Avaliação ponto a ponto de sistemas de imagem radiológica utilizando funções de espalhamento de ponto simuladas. / Evaluating the focal sopt MTF in all radiological field location by computer simulation.

AUTOR(ES)

Paulo Mazzoncini de Azevedo Marques

DATA DE PUBLICAÇÃO

1994

RESUMO

In this work a method of evaluation for the radiological imaging systems performance by simulated transfer functions for any X-ray field region is proposed. The simulation procedures provide information of the changes of the focal spot sizes and, therefore, of the Point Spread Function (PSF) along the field. The evaluation yields the bi-dimensional optical Transfer Functions calculated from Fourier Transformation of the simulated PSFs. This method provides: the spatial frequency response for the entire radiation field of the radiological systems; comparisons of the image sharpness relative to equivalent field regions for different systems; and the study of a singular region in order to predict image distortions.

ASSUNTO(S)

point spread function modulation transfer function radiological imaging quality assurance função de espalhamento de ponto função de transferência de modulação garantia de qualidade em imagem radiológica

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