Comparison between average glandular dose (AGD) calculated by mammography equipment and VolparaDose software
DOI:
https://doi.org/10.15392/2319-0612.2024.2635Keywords:
Mammography, average glandular dose, Breast densityAbstract
In mammography equipment, the average glandular dose (AGD) is calculated from the incident air kerma (Ki) multiplied by conversion coefficients derived from Monte Carlo simulations, which consider breast thickness and density. However, calculating AGD using specific and true patient information results in a dose that is closer to the real dose. This study compares the AGD calculated by two different methods: the equipment, which uses conversion coefficients, and the VolparaDose software, which uses the patient-specific volumetric breast density (VBD). The study was conducted with a sample of 3,209 images from screening mammography exams. Through hypothesis tests for the mean difference, it was demonstrated that for compressed breast thicknesses > 27.1 mm, the AGD was significantly lower (p-value < 0.05) when calculated by the equipment itself compared to the AGD calculated by the VolparaDose software. The VBD was a significant factor in the difference in AGD calculated between the two methods. The results suggest that the AGD calculated by the equipment may be underestimating the dose when compared to the AGD calculated by the VolparaDose software.
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[1] DANCE DR, SECHOPOULOS I. Dosimetry in x-ray-based breast imaging. Phys Med Biol, v. 61, n. 19, p. R271–304, 2016. DOI: https://doi.org/10.1088/0031-9155/61/19/R271
[2] DANCE DR, SKINNER CL, YOUNG KC, BECKETT JR, KOTRE CJ. Additional factors for the estimation of mean glandular breast dose using the UK mammography dosimetry protocol. Phys Med Biol, v. 45, n. 11, p. 3225–3240, 2000. DOI: https://doi.org/10.1088/0031-9155/45/11/308
[3] WU X, GINGOLD E, BARNES G, TUCKER D. Normalized Average Glandular Dose in Molybdenum Target-Rhodium Filter and Rhodium Target-Rhodium Filter Mammography. Rad, v. 192, n. 1, p. 83–9, 1994. DOI: https://doi.org/10.1148/radiology.193.1.8090926
[4] HILL ML, HIGHNAM R, MOULINEAUX IL, WELINTONG N. Low-dose breast density assessment. in: PROCEEDINGS OF THE 2019 EUROPEAN CONGRESS OF RADIOLOGY (ECR), Viena, Áustria.2019.
[5] VOLPARA. Volpara ® Data Manager User Manual. p. 1–59, 2017.
[6] NGUYEN J V., WILLIAMS MB, PATRIE JT, HARVEY JA. Do women with dense breasts have higher radiation dose during screening mammography? Breast J, v. 24, n. 1, p. 35-40, 2016. DOI: https://doi.org/10.1111/tbj.12833
[7] SULEIMAN ME, BRENNAN PC, MCENTEE MF. Mean glandular dose in digital mammography: a dose calculation method comparison. J Med Imaging, v. 4, n. 1, p. 013502, 2017. DOI: https://doi.org/10.1117/1.JMI.4.1.013502
[8] TROMANS CE, HIGHNAM R, MORRISH O, BLACK R, TUCKER L, GILBERT F, et al. Patient specific dose calculation using volumetric breast density for mammography and tomosynthesis. Lect Notes Comput Sci, v. 8539, p. 158–65, 2014. DOI: https://doi.org/10.1007/978-3-319-07887-8_23
[9] MACHIDA Y, SAITA A, NAMBA H, FUKUMA E. Automated volumetric breast density estimation out ofdigital breast tomosynthesis data: feasibility study of a new software version. Springerplus. v. 5, n. 1, p. 780, 2016. DOI: https://doi.org/10.1186/s40064-016-2519-4
[10] HIGHNAM, R. Patient-Specific Radiation Dose Estimation in Breast Cancer Screening, 2014. Available at: https://www.volparasolutions.com/assets/Uploads/VolparaDose-White-Paper.pdf. Accessed on: August 10, 2024
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Copyright (c) 2024 Camila Engler, Laila Fernanda Moreira de Almeida, Elaine Rodrigues Leite, Fernando Leyton, Maria do Socorro Nogueira

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