Pirchio R, Stefanic A, Rojas R R
Comisión Nacional de Energía Atómica, Av. Pro González y Aragón 15, B1802AYA, Ezeiza, Buenos Aires, Argentina.
Centro de Diagnóstico Rojas, Laprida 1810, C1425EKP, CABA, Buenos Aires, Argentina.
Radiat Prot Dosimetry. 2019 Dec 31;186(4):469-478. doi: 10.1093/rpd/ncz052.
The objective of this study was to characterise thermoluminescent (TLDs) and optically stimulated luminescent dosimeters (OSLDs) at low X-ray energies and estimate the eye lens (DL), thyroid (DT) and mean glandular (DG) doses received during Full-Field Digital Mammography (FFDM) and Digital Breast Tomosynthesis (DBT). The dosimeters were characterised in mammography energies. DL, DT and DG were estimated in FFDM and DBT mode taping dosimeters on the skin of the thyroid gland and on the left eye lens of an Alderson phantom. Dosimeters were also placed on the top of a NORMI PAS phantom simulating a compressed breast. The accuracy, precision and lower limit of detection (LLD) for TLDs and OSLDs were 5 and 8%, 6 and 3%, and 38 and 11 μSv, respectively. The linearity of the kerma response had an R2 > 0.99 and energy dependence was lower than 40%. DT ranged from 0.40 to 2.87 μGy for FFDM and 1.27 to 5.99 μGy for DBT. DG was between 0.50 and 1.27 mGy for FFDM and 1.07 and 1.60 mGy for DBT. DL was below the LLD. Dosimeters showed good performance. DG values were lower than those found in the literature, whereas DT value agreed with references. Differences between DG and DT determined with OSLDs and TLDs were lower than 10% and 200%.
本研究的目的是表征低X射线能量下的热释光剂量计（TLD）和光激励发光剂量计（OSLD），并估计在全视野数字乳腺摄影（FFDM）和数字乳腺断层合成（DBT）过程中眼睛晶状体（DL）、甲状腺（DT）和平均腺体（DG）所接受的剂量。在乳腺摄影能量下对剂量计进行了表征。在FFDM和DBT模式下，将剂量计贴在Alderson体模的甲状腺皮肤和左眼晶状体上，估计DL、DT和DG。剂量计还放置在模拟压缩乳腺的NORMI PAS体模顶部。TLD和OSLD的准确度、精密度和检测下限（LLD）分别为5%和8%、6%和3%，以及38和11 μSv。比释动能响应的线性度R2>0.99，能量依赖性低于40%。FFDM的DT范围为0.40至2.87 μGy，DBT的DT范围为1.27至5.99 μGy。FFDM的DG在0.50至1.27 mGy之间，DBT的DG在1.07至1.60 mGy之间。DL低于LLD。剂量计表现出良好的性能。DG值低于文献中报道的值，而DT值与参考文献一致。用OSLD和TLD测定的DG和DT之间的差异低于10%和200%。
