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首页> 外文期刊>EPJ Web of Conferences >Validation of Monte Carlo simulation of mammography with TLD measurement and depth dose calculation with a detailed breast model
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Validation of Monte Carlo simulation of mammography with TLD measurement and depth dose calculation with a detailed breast model

机译：使用TLD测​​量和详细剂量模型的深度剂量计算验证了乳腺摄影的蒙特卡洛模拟

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Mean glandular dose (MGD) is not only determined by the compressed breast thickness (CBT) and the glandular content, but also by the distribution of glandular tissues in breast. Depth dose inside the breast in mammography has been widely concerned as glandular dose decreases rapidly with increasing depth. In this study, an experiment using thermo luminescent dosimeters (TLDs) was carried out to validate Monte Carlo simulations of mammography. Percent depth doses (PDDs) at different depth values were measured inside simple breast phantoms of different thicknesses. The experimental values were well consistent with the values calculated by Geant4. Then a detailed breast model with a CBT of 4 cm and a glandular content of 50%, which has been constructed in previous work, was used to study the effects of the distribution of glandular tissues in breast with Geant4. The breast model was reversed in direction of compression to get a reverse model with a different distribution of glandular tissues. Depth dose distributions and glandular tissue dose conversion coefficients were calculated. It revealed that the conversion coefficients were about 10% larger when the breast model was reversed, for glandular tissues in the reverse model are concentrated in the upper part of the model.
机译：平均腺体剂量（MGD）不仅取决于受压的乳房厚度（CBT）和腺体含量，还取决于乳房中腺体组织的分布。乳腺摄影术中乳房内部的深度剂量已受到广泛关注，因为腺体剂量随深度增加而迅速降低。在这项研究中，进行了使用热​​发光剂量计（TLD）的实验，以验证乳房X线照相术的蒙特卡洛模拟。在不同厚度的简单乳房幻象中测量了不同深度值的深度剂量百分比（PDD）。实验值与Geant4计算的值完全一致。然后，在先前的工作中建立了一个详细的乳房模型，其CBT为4 cm，腺体含量为50％，用于研究Geant4对乳房中腺体组织分布的影响。将乳房模型在压缩方向上反转，以获得具有不同腺组织分布的反转模型。计算深度剂量分布和腺组织剂量转换系数。结果表明，当乳房模型反转时，转换系数大约增加了10％，因为反转模型中的腺组织集中在模型的上部。

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