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Doctoral Thesis
DOI
https://doi.org/10.11606/T.54.1982.tde-10032015-153234
Document
Author
Full name
Annie France Frere Slaets
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1982
Supervisor
Committee
Oliveira, Sergio Mascarenhas (President)
Zimmerman, Robert Lee (President)
Dias Neto, Alipio
Ribeiro, Paulo Costa
Simão, Clovis
Title in Portuguese
Investigações de qualidade de imagens radiológicas com um sistema densiométrico computarizado
Keywords in Portuguese
Não disponível
Abstract in Portuguese
Nesta tese foi desenvolvido um novo método para determinar a curva de calibração (curva H-D) diretamente a partir das diferenças de densidades de duas imagens de fenda obtidas com diversas exposições conhecidas. Com esse método a qualidade da imagem radiográfica pode ser determinada com um simples filme contendo somente duas imagens de fenda sem usar a curva de calibração sensiométrica convencional. Foi também mostrado que o sistema densitométrico computadorizado Optronics permite localizar microcalcificações mamográficas que não são detectáveis visualmente
Title in English
Not available
Keywords in English
Not available
Abstract in English
In the present work a new method was developed to determine the H-D curve directly from the density differences of two slit images obtained with different known exposures. With this method the MTF containing only two slit images, avoiding the need of a conventional sensitometric strip. We have also investigated the use of the Optronics microdensitometer to detect microcalcifications in mammographic radiology
 
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Publishing Date
2015-03-16
 
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