Department of Radiologic Sciences, Faculty of Allied Health Sciences, Kuwait University, P.O.Box 31470, Sulaibikhat, 90805, Kuwait.
Department of Radiologic Sciences, Faculty of Allied Health Sciences, Kuwait University, P.O.Box 31470, Sulaibikhat, 90805, Kuwait.
Radiography (Lond). 2020 Aug;26(3):e129-e133. doi: 10.1016/j.radi.2019.12.004. Epub 2019 Dec 20.
There are concerns regarding the increase in radiation dose among women undergoing both digital mammography (DM) and digital breast tomosynthesis (DBT). The aim of this study was to evaluate the effect of different exposure parameters on entrance skin dose (ESD) and average glandular dose (AGD) for DM and DBT using a phantom.
The ESD and AGD of 30 DM and DBT (cranio-caudal projection) examinations using a tissue equivalent phantom where acquired using a GE Senographe Essential DM unit. Commercial phantoms were used to simulate three different breast thicknesses and compositions. Tube potential, tube load, and target/filter combinations were also varied with ESD and AGD recorded directly from the DM unit. Comparisons were made using the non-parametric Kruskal Wallis, Mann-Whitney, and Wilcoxon signed rank tests.
The individual ESD values for 4 cm, 5 cm, and 6 cm thick phantoms for DM and DBT at Rh/Rh target/filter combination and 30-32 kV/56 mAs levels were 5.06 and 4.18 mGy; 5.82 and 5.08 mGy; and 7.26 and 11.4 mGy, respectively; while AGDs were 1.57 and 1.30 mGy, 1.33 and 1.39 mGy; and 1.29 and 3.60 mGy, respectively. The Kruskal-Wallis test showed a statistically significant difference in AGD for DM (P = .029) but not for DBT (P = 0.368). The Mann-Whitney and Wilcoxon signed rank tests showed no statistically significant difference for ESD or AGD between both DM and DBT techniques (P = .827 and .513). The percentage differences in ESD for phantom thicknesses of 4 cm, 5 cm, and 6 cm between DBT and DM ranged between -21% and 36%; while for AGD between -21% and 64.2%.
The ESD and AGD for single view projection in DM and DBT showed differences at 4 and 6 cm breast thicknesses and compositions but not at 5 cm thickness with 30-32 kV and a Rh/Rh target/filter combination.
A fibro-fatty breast results in less radiation dose variations in terms of ESD and AGD between DM and DBT techniques.
人们对接受数字乳腺摄影（DM）和数字乳腺断层合成术（DBT）的女性辐射剂量增加表示担忧。本研究旨在使用体模评估不同曝光参数对 DM 和 DBT 的入射皮肤剂量（ESD）和平均腺体剂量（AGD）的影响。
使用组织等效体模在 GE Senographe Essential DM 装置上获得 30 例 DM 和 DBT（从头尾位）检查的 ESD 和 AGD。使用商业体模模拟三种不同的乳房厚度和组成。还改变了管电压、管电流负载以及靶/滤器组合，直接从 DM 装置记录 ESD 和 AGD。使用非参数 Kruskal Wallis、Mann-Whitney 和 Wilcoxon 符号秩检验进行比较。
在 Rh/Rh 靶/滤器组合和 30-32 kV/56 mAs 水平下，4 cm、5 cm 和 6 cm 厚体模的 DM 和 DBT 的个体 ESD 值分别为 5.06 和 4.18 mGy；5.82 和 5.08 mGy；7.26 和 11.4 mGy，而 AGD 分别为 1.57 和 1.30 mGy、1.33 和 1.39 mGy；和 1.29 和 3.60 mGy。Kruskal-Wallis 检验显示 DM 的 AGD 存在统计学显著差异（P=.029），但 DBT 无统计学差异（P=.368）。Mann-Whitney 和 Wilcoxon 符号秩检验显示 DM 和 DBT 技术的 ESD 或 AGD 之间无统计学显著差异（P=.827 和.513）。4 cm、5 cm 和 6 cm 体模厚度之间 DBT 和 DM 的 ESD 百分比差异在-21%到 36%之间；而 AGD 为-21%到 64.2%。
在 4 和 6 cm 乳房厚度和组成时，DM 和 DBT 中单视图投影的 ESD 和 AGD 存在差异，但在 5 cm 厚度和 Rh/Rh 靶/滤器组合时无差异。
纤维脂肪乳房会导致 DM 和 DBT 技术之间 ESD 和 AGD 的辐射剂量变化较小。
