Monte Carlo derivation of filtered tungsten anode X-ray spectra for dose computation in digital mammography

Paixão, Lucas; Oliveira, Bruno Beraldo; Viloria, Carolina; Oliveira, Marcio Alves de; Teixeira, Maria Helena Araújo; Nogueira, Maria do Socorro

doi:10.1590/0100-3984.2014.0108

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Original Articles • Radiol Bras 48 (6) • Nov-Dec 2015 • https://doi.org/10.1590/0100-3984.2014.0108 copy

Monte Carlo derivation of filtered tungsten anode X-ray spectra for dose computation in digital mammography^* * Study developed at Centro de Desenvolvimento da Tecnologia Nuclear / Comissão Nacional de Energia Nuclear (CDTN/CNEN), Belo Horizonte, MG, Brazil.

Derivação Monte Carlo de espectros filtrados de raios X de ânodo de tungstênio para determinação de dose em mamografia digital

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective:

Derive filtered tungsten X-ray spectra used in digital mammography systems by means of Monte Carlo simulations.

Materials and Methods:

Filtered spectra for rhodium filter were obtained for tube potentials between 26 and 32 kV. The half-value layer (HVL) of simulated filtered spectra were compared with those obtained experimentally with a solid state detector Unfors model 8202031-H Xi R/F & MAM Detector Platinum and 8201023-C Xi Base unit Platinum Plus w mAs in a Hologic Selenia Dimensions system using a direct radiography mode.

Results:

Calculated HVL values showed good agreement as compared with those obtained experimentally. The greatest relative difference between the Monte Carlo calculated HVL values and experimental HVL values was 4%.

Conclusion:

The results show that the filtered tungsten anode X-ray spectra and the EGSnrc Monte Carlo code can be used for mean glandular dose determination in mammography.

Keywords:
Mammography; X-ray spectra; HVL; Monte Carlo

HVL (mmAl)
kV	Experimental	Monte Carlo
26	0.511 ± 3%^* * Estimated values.	0.513 ± 3%
27	0.518 ± 3%	0.527 ± 3%
28	0.528 ± 3%	0.535 ± 3%
29	0.537 ± 3%	0.552 ± 3%
30	0.545 ± 3%	0.565 ± 3%
31	0.552 ± 3%	0.574 ± 3%
32	0.562 ± 3%^* * Estimated values.	0.585 ± 3%

Uncertainty sources	Uncertainty (%)
Calibration	2.0
Detector resolution	0.5
Angular dependence	0.5
Temperature and humidity	0.5
Energy dependence	2.0
Readings accuracy^* * Standard deviation of the average of three measurements.	0.3
Measurement position ± 2 mm for 700 mm.	0.3
Combined standard uncertainty (k = 1)	3.0

Publicação do Colégio Brasileiro de Radiologia e Diagnóstico por Imagem Av. Paulista, 37 - 7º andar - conjunto 71, 01311-902 - São Paulo - SP, Tel.: +55 11 3372-4541, Fax: 3285-1690, Fax: +55 11 3285-1690 - São Paulo - SP - Brazil
E-mail: radiologiabrasileira@cbr.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Mailing Address: Lucas Paixão. Centro de Desenvolvimento da Tecnologia Nuclear. Avenida Presidente Antônio Carlos, 6627, Campus UFMG, Pampulha. Belo Horizonte, MG, Brazil, 31270-901. E-mail: lucaspaixxao@hotmail.com.

Brasil

Brasil

Monte Carlo derivation of filtered tungsten anode X-ray spectra for dose computation in digital mammography* * Study developed at Centro de Desenvolvimento da Tecnologia Nuclear / Comissão Nacional de Energia Nuclear (CDTN/CNEN), Belo Horizonte, MG, Brazil.

Derivação Monte Carlo de espectros filtrados de raios X de ânodo de tungstênio para determinação de dose em mamografia digital

Abstract

Objective:

Materials and Methods:

Results:

Conclusion:

Monte Carlo derivation of filtered tungsten anode X-ray spectra for dose computation in digital mammography^* * Study developed at Centro de Desenvolvimento da Tecnologia Nuclear / Comissão Nacional de Energia Nuclear (CDTN/CNEN), Belo Horizonte, MG, Brazil.