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Proceedings Paper

Evaluating the focal spot MTF in all field locations by computer simulation
Author(s): Paulo M. Azevedo Marques; Ricardo Jose Ferrari; Homero Schiabel; Henrique J. Q. de Oliveira; Marcio A. Marques; Annie France Frere; Aledir S. Pereira
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Paper Abstract

This paper proposes a method of evaluating x-ray tube focal spots and the corresponding image sharpness by computer simulation based on the transfer functions theory. This theory was chosen due to its quantitative as well as qualitative response for the radiographic systems performance, which provides less subjective evaluations and better predictions about the characteristics of the imaging process. The present method uses as input data the effective focal spot dimensions in the field center and the value of the target angulation. An ideal pinhole which scans the entire radiation field is simulated. It allows to obtain the point spread function (PSFs) for any region of interest. The modulation transfer functions (MTFs) are then determined from 2D Fourier transformation from the PSFs. This provides to evaluate the focal spot projection in all field locations and therefore to predict the sharpness of the associated image. Furthermore the computer simulation reduces greatly the number of practical procedures required for obtaining the data which provides the MTF evaluation of radiographic systems.

Paper Details

Date Published: 14 November 1996
PDF: 8 pages
Proc. SPIE 2847, Applications of Digital Image Processing XIX, (14 November 1996); doi: 10.1117/12.258266
Show Author Affiliations
Paulo M. Azevedo Marques, Univ. de Sao Paulo (Brazil)
Ricardo Jose Ferrari, Univ. de Sao Paulo (Brazil)
Homero Schiabel, Univ. de Sao Paulo (Brazil)
Henrique J. Q. de Oliveira, Univ. de Sao Paulo (Brazil)
Marcio A. Marques, Univ. de Sao Paulo (Brazil)
Annie France Frere, Univ. de Sao Paulo (Brazil)
Aledir S. Pereira, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 2847:
Applications of Digital Image Processing XIX
Andrew G. Tescher, Editor(s)

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