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Proceedings Paper

Computer simulation technique to preview the influence of the recording system on the image sharpness in mammography
Author(s): Homero Schiabel; Marcia A. Silva; Henrique J. Q. de Oliveira; Paulo M. Azevedo Marques; Annie France Frere
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Paper Abstract

Following procedures used to simulate the image sharpness along the radiation field based on X-rays geometric exposure developed in previous work, here we describe another computer simulation procedure intended to evaluate the influence of any recording system as radiographic film or screen-film combinations, on the image sharpness in mammography. In this current work we take into account the parameters from the recording system besides the radiation projection from the focal spot in order to yield a simulated image on the computer screen relative to the expected image to be obtained in actual conditions with a singular recording system for a singular mammography equipment. The focal spot sizes in all field locations, as well as the respectives intensity distributions, the sensitometric curve for a radiographic film or for a screen-film combination, and also the screen intensifying factor, conversion efficiency, absorption factor and emission spectrum were used as input parameters for the simulation. Simulated images were compared to those obtained with actual mammographic equipment, by using a resolution phantom, and both types of images were in good agreement. The main advantage of this procedure will be the possibility of predicting the image sharpness characteristics for any mammography equipment with any type of recording system without exposure tests.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317064
Show Author Affiliations
Homero Schiabel, Univ. of Sao Paulo (Brazil)
Marcia A. Silva, Univ. of Sao Paulo (Brazil)
Henrique J. Q. de Oliveira, Univ. of Sao Paulo (Brazil)
Paulo M. Azevedo Marques, Univ. of Sao Paulo (Brazil)
Annie France Frere, Univ. of Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins III; John M. Boone, Editor(s)

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