Estudo sobre fatores intrínsecos a paciente que influenciam na dose glandular média em exames de tomossíntese de mama

Camila Engler; Márcia Regina Pererira Attie; Lucas Paixão Reis; Peterson Lima Squair; Margarita Chevalier; Maria do Socorro Nogueira

doi:10.15392/bjrs.v8i1.1148

Authors

Camila Engler https://orcid.org/0000-0003-3656-5313
Márcia Regina Pererira Attie
Lucas Paixão Reis
Peterson Lima Squair
Margarita Chevalier
Maria do Socorro Nogueira

DOI:

https://doi.org/10.15392/bjrs.v8i1.1148

Keywords:

, Dose Glandular Média, Densidade Mamária, Espessura da Mama, Volpara, Mamografia/Medium Glandular Dose, Mammary Density, Breast Thickness, Mammography

Abstract

RESUMO

Objetivo: A dose glandular média (DGM) é a grandeza dosimétrica utilizada para estimar a dose de radiação à qual um paciente é exposta ao realizar um exame de mamografia. Este estudo tem como objetivo verificar a relação entre os fatores característicos do paciente e a DGM. Materiais e Métodos: As imagens de tomossíntese mamária de 660 pacientes foram analisadas usando o software Volpara. A partir desta análise, obteve-se a densidade volumétrica da mama (DVM) e a DGM. A idade do paciente e a espessura da mama comprimida (EMC) foram obtidas do cabeçalho DICOM das imagens. Utilizando o software estatístico SPSS, foram realizados testes de correlação entre a DVM, a idade do paciente e a TCC com a DGM, e calculados os respectivos coeficientes de correlação (r). Resultados: A amostra de pacientes teve uma média da EMC de 59 ± 12mm, mediana da idade da paciente de 51 anos (25 a 87 anos), mediana da DGD de 1,53 mGy (0,43 a 4,68 mGy) e mediana da DVM de 8% ( Intervalo de 2,16% a 36,89%). Os coeficientes de correlação calculados foram 0,695 para a relação entre DGM e EMC, 0,095 para a relação entre DGM e DVM e -0,280 para a relação entre DGM e a idade da paciente. Conclusão: Os resultados mostram que a EMC é o fator mais relacionado ao aumento da DGM. DVM é o fator com menor impacto e a idade da paciente tem uma relação inversa com a DGM.

ABSTRACT

Objective: Mean Glandular Dose (MGD) is the dosimetric quantity used to estimate the radiation dose to which a patient is exposed when performing a mammography examination. This study aims to verify the relationship between patient characteristic factors and MGD. Materials and Methods: Breast tomosynthesis images of 660 patients were analyzed using Volpara software. From this analysis, the volumetric breast density (VBD) and the MGD were obtained. Patient age and compressed breast thickness (CBT) were obtained from the DICOM header of the images. Using the SPSS statistical software, correlation tests were performed between the VBD, patient age and CBT with the MGD, and the respective correlation coefficients (r) were calculated. Results: The patient sample had a mean CBT of 59 (± 12mm), median patient age of 51 years (25 to 87 years range), median MGD of 1.53 mGy (0.43 to 4.68 mGy range), and median VBD of 8% (2.16% to 36.89% range). The calculated correlation coefficients were 0.695 for the relationship between MGD and CBT, 0.095 for the relationship between MGD and VBD, and -0.280 for the relationship between MGD and patient age. Conclusion: The results show that CBT is the factor most related to the MGD increase. VBD is the factor with the least impact and the patient's age has an inverse relationship with the MGD.

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