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Doctoral Thesis
DOI
10.11606/T.23.2004.tde-30082004-143643
Document
Author
Full name
Felipe Paes Varoli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2004
Supervisor
Committee
Costa, Claudio (President)
Arita, Emiko Saito
Montebelo Filho, Agenor
Sewell, Cristina Maria Dumit
Tavano, Orivaldo
Title in Portuguese
"Estudo comaparativo das densidades radiográficas de diferentes filmes periapicais obtidas por meio da análise computadorizada em valores de alumínio-equivalente"
Keywords in Portuguese
Alumínio-equivalente
Densidade radiográfica
Filme radiográfico
Radioproteção
Abstract in Portuguese
RESUMO O objetivo deste estudo foi obter as densidades radiográficas de diferentes filmes periapicais por meio de um programa computadorizado que utiliza a imagem equivalente em alumínio (alumínio-equivalente). Avaliaram-se os filmes Agfa Dentus M2 “Comfort”, Kodak InSight, Kodak Ektaspeed Plus, Kodak Ultra-speed e Kodak D. Todos foram expostos aos raios X juntamente com um escalímetro de Alumínio, variando-se o tempo de exposição (0,1 a 1 segundo). Após a leitura das densidades radiográficas construiu-se um gráfico para compararmos as propriedades sensitométricas dos filmes. O filmes mais sensíveis foram o Agfa Dentus M2 “Comfort” e o Kodak InSight, e os menos sensíveis o Kodak Ultra-speed e o Kodak D. Os filmes Agfa Dentus M2 “Comfort” e Kodak InSight apresentaram os maiores contrastes. Os resultados obtidos por este método indicam que deve-se utilizar os filmes Agfa Dentus M2 “Comfort” e Kodak InSight para reduzir a dose de radiação recebida pelo paciente.
Title in English
Comparison of radiographic densities from different dental intraoral x-ray films by computed analysis into aluminium-equivalent values
Keywords in English
Aluminium-equivalent
Radiation protection
Radiographic density
X-ray film
Abstract in English
ABSTRACT The aim of this study was to obtain radiographic densities from different dental intraoral x-ray films through a software using aluminium-equivalent image. The densities had been measured in order to compare dental x-ray films in terms of speed, base plus fog, and contrast. Agfa Dentus M2 “Comfort”, Kodak InSight, Kodak Ektaspeed Plus, Kodak Ultra-speed and Kodak D-speed films were evaluated. All films were exposed together with aluminium wedge, at times ranging from 0,1-1 second. By plotting a graphic of density against exposure, sensitometric properties were compared. Agfa Dentus M2 “Comfort” and Kodak InSight films obtained the highest film speed; Kodak Ultra-speed and Kodak D-speed films exhibited the lowest sensitivity. Agfa Dentus M2 “Comfort” and Kodak InSight films had presented valuesm to contrast superior to other films. Therefore, Agfa Dentus M2 “Comfort” and Kodak InSight films must be recommended to minimize the radiation dose to the patient.
 
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Publishing Date
2004-12-13
 
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