Department of Radiography & Radiotherapy, Faculty of Allied Health Sciences, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka.
Department of Radiography & Radiotherapy, Faculty of Allied Health Sciences, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka.
Radiography (Lond). 2023 May;29(3):573-576. doi: 10.1016/j.radi.2023.03.010. Epub 2023 Mar 28.
When the patient dose in mammography is assessed, it is important to evaluate both average glandular dose (AGD) and entrance surface dose (ESD). A dose survey on both AGD and ESD in mammography has never been studied in Sri Lanka. Therefore, the present study aimed to evaluate the patient dose received during a full-field digital breast tomosynthesis (DBT) examination by determining both AGD and ESD.
The study was performed on 140 patients who underwent DBT examination. The AGD, ESD, compression breast thickness (CBT), half-value layer (HVL), target/filter combination, kVp, and mAs values were obtained from the machine, and AGD for each projection was calculated using the equation proposed by the Dance 2011.
The measured mean AGDs and ESDs of both the breasts were statistically significantly lower than the reference values given by European protocol (p < 0.05). There were no statistically significant differences in both AGDs and ESDs between the right and left breast, between right craniocauidal (RCC) and left craniocaudal (LCC), and between right mediolateral oblique (RMLO) and left mediolateral oblique (LMLO) examinations (p > 0.05). The measured median AGDs and ESDs received for MLO projections of both breasts were statistically significantly higher than that of CC projections (p < 0.05).
The patients receive a low radiation dose during their DBT examination with both lowered AGD and ESD than the recommended values.
The results can be used as a baseline to optimize the radiation dose in mammography in Sri Lanka.
在评估乳腺摄影中的患者剂量时，评估平均腺体剂量（AGD）和入射表面剂量（ESD）都很重要。在斯里兰卡，从未对乳腺摄影中的 AGD 和 ESD 进行过剂量调查。因此，本研究旨在通过确定 AGD 和 ESD 来评估全视野数字乳腺断层合成（DBT）检查中患者所接受的剂量。
本研究对 140 名接受 DBT 检查的患者进行了研究。从机器中获取 AGD、ESD、压缩乳腺厚度（CBT）、半价层（HVL）、靶/滤过组合、kVp 和 mAs 值，并使用 Dance 2011 提出的公式计算每个投影的 AGD。
双侧乳房的实测平均 AGD 和 ESD 均明显低于欧洲协议给出的参考值（p<0.05）。右乳和左乳、右颅尾（RCC）和左头尾（LCC）以及右内外斜（RMLO）和左内外斜（LMLO）之间的 AGD 和 ESD 无统计学差异（p>0.05）。双侧乳房 MLO 投影的实测中位 AGD 和 ESD 明显高于 CC 投影（p<0.05）。
患者在 DBT 检查中接受的辐射剂量较低，AGD 和 ESD 均低于推荐值。
结果可作为斯里兰卡乳腺摄影中优化辐射剂量的基线。
