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Radiation Protection Dosimetry Advance Access originally published online on March 14, 2009
Radiation Protection Dosimetry 2009 133(3):136-143; doi:10.1093/rpd/ncp031
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Evaluation of the entrance surface air kerma in mammographic examinations in Rio de Janeiro, Brazil

L. C. G. Oliveira1,*, T. K. Dias2, R. T. Lopes1 and S. Kodlulovich3

1 Laboratório de Instrumentação Nuclear (LIN/COPPE/UFRJ), Centro de Tecnologia, Bloco I, Sala 133 Cidade Universitária, Ilha do Fundão, Rio de Janeiro, CEP 21949-900 RJ, Brasil
2 Universidade Federal Fluminense (UFF), Faculdade de Medicina, Rua Marquês do Paraná, 303, 2° andar Prédio Principal, Centro, Niterói, Rio de Janeiro, CEP 24030-210, RJ, Brasil
3 Instituto de Radioproteção e Dosimetria (IRD/CNEN), Avenida Salvador Allende s/n, Jacarepaguá, Rio de Janeiro, CEP 22780-160, RJ, Brasil

* Corresponding author: larissaconceicao{at}yahoo.com.br

Received September 12, 2008, amended February 5, 2009, accepted February 19, 2009

The aim of this work was to evaluate the distribution of the entrance surface air kerma (ESAK) and the average glandular dose (DG) in four mammography facilities located in the city of Rio de Janeiro. The ESAK values were estimated from the X-ray tube output rate (mGy/mAs) parameters. The image quality was evaluated by the radiologists in each clinic. The ESAK values obtained for a breast thickness of 45 mm were 5.58 mGy in Clinic A, 10.07 mGy in Clinic B, 13.89 mGy in Clinic C and 7.21 mGy in Clinic D. For DG, it can be seen that, for the same compressed breast thickness (50 mm), the value varied from 0.20 to 3.60 mGy, with a mean value of 1.50 mGy for all the clinics. In image quality evaluation, Clinic D was the only one that presented a very low acceptability for quality criteria and inadequacies in relation to specks, masses and optical density.


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