Equivalent breast thickness and dose sensitivity of a next iteration 3D structured breast phantom with lesion models

Elisabeth Salomon; Friedrich Semturs; Ewald Unger; Lesley Cockmartin; Dimitar Petrov; Liesbeth Vancoillie; Michael Figl; Hilde Bosmans; Johann Hummel

doi:10.1117/12.2548956

16 March 2020 Equivalent breast thickness and dose sensitivity of a next iteration 3D structured breast phantom with lesion models

Elisabeth Salomon, Friedrich Semturs, Ewald Unger, Lesley Cockmartin, Dimitar Petrov, Liesbeth Vancoillie, Michael Figl, Hilde Bosmans, Johann Hummel

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Proceedings Volume 11312, Medical Imaging 2020: Physics of Medical Imaging; 113120K (2020) https://doi.org/10.1117/12.2548956
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

Purpose: In this work we present equivalent breast thickness and dose sensitivity of a next iteration 3D structured breast phantom with lesion models to demonstrate its potential use for quality assurance measurements in breast imaging. Methods: PMMA equivalent thickness was determined employing the automatic exposure control (AEC) of Siemens Mammomat Inspiration and Siemens Mammomat Revelation. A 2D projection image of the phantom was acquired and the corresponding AEC settings recorded as reference. Equivalent PMMA thickness was found by interpolating between three PMMA thicknesses with mAs values close to the reference settings selected by AEC. Dose sensitivity of the reconstructed digital breast tomosynthesis (DBT) images was assessed by two experienced readers using a four alternative forced choice (4-AFC) study. Three different dose levels for lesion models and microcalcifications were evaluated. Results: PMMA equivalent thickness of the phantom was 46.8 mm and 47.0 mm for measurements on Siemens Mammomat Inspiration and Siemens Mammomat Revelation which equals to a breast equivalent thickness of 55.5 mm and 55.8 mm, respectively, compared to a physical phantom thickness of 53.5 mm. For lesion models dose sensitiviy of the detectability was not obvious. For microcalcification the diameter threshold was found to increase for decreasing dose from high dose to AEC to low dose. Conclusions: We found the measured equivalent breast thickness of our phantom to be close to its physical thickness. It can be concluded that changes in dose can be detected by the presented phantom for the tested dose levels.

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Elisabeth Salomon, Friedrich Semturs, Ewald Unger, Lesley Cockmartin, Dimitar Petrov, Liesbeth Vancoillie, Michael Figl, Hilde Bosmans, and Johann Hummel "Equivalent breast thickness and dose sensitivity of a next iteration 3D structured breast phantom with lesion models", Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 113120K (16 March 2020); https://doi.org/10.1117/12.2548956

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