Faculty of Medicine, University of Kufa, Iraq; University of Salford, Salford, UK.
Keele University, Keele, UK.
J Med Imaging Radiat Sci. 2020 Dec;51(4):599-603. doi: 10.1016/j.jmir.2020.08.018. Epub 2020 Sep 14.
To compare Mean Glandular Dose (MGD) and effective dose from digital breast tomosynthesis (DBT) screening with that from full field digital mammography (FFDM) screening.
To simulate compressed breasts, two Perspex-polyethylene breast phantoms were used, one phantom for compressed breast in craniocaudal and the other for compressed breast in mediolateral oblique. An adult ATOM dosimetry phantom was loaded with high sensitivity thermoluminescence dosimeters; the phantom was then positioned on Hologic Selenia Dimensions mammographic machine to imitate DBT and 4-view FFDM screening. Organ radiation doses were measured from 4-view DBT and 4-view FFDM (craniocaudal and mediolateral oblique views for each breast). Organ radiation doses were used to calculate effective dose from one screening session.
MGD for DBT was 3.6 mGy; MGD for FFDM was 2.8 mGy. For DBT, other organs (e.g. thymus, lungs, salivary glands, thyroid, contralateral breast and bone marrow) radiation dose was also higher than for FFDM. The use of DBT for breast cancer screening increases the effective dose (E) of one screening session by 22%. E for DBT was 0.44 mSv; E for FFDM was 0.34 mSv.
The use of DBT for breast cancer screening increases the radiation dose to screening clients.
比较数字乳腺断层合成（DBT）筛查与全视野数字化乳腺摄影（FFDM）筛查的平均腺体剂量（MGD）和有效剂量。
为了模拟压缩乳房，使用了两个有机玻璃-聚乙烯乳房体模，一个用于头尾位压缩乳房，另一个用于内外斜位压缩乳房。将一个成人 ATOM 剂量体模装入高灵敏度热释光剂量计；然后将体模放置在 Hologic Selenia Dimensions 乳腺机上，模拟 DBT 和 4 视图 FFDM 筛查。从 4 视图 DBT 和 4 视图 FFDM（每侧乳房的头尾位和内外斜位）测量器官辐射剂量。使用器官辐射剂量计算单次筛查的有效剂量。
DBT 的 MGD 为 3.6 mGy；FFDM 的 MGD 为 2.8 mGy。对于 DBT，其他器官（如胸腺、肺、唾液腺、甲状腺、对侧乳房和骨髓）的辐射剂量也高于 FFDM。乳腺癌筛查中使用 DBT 会使单次筛查的有效剂量（E）增加 22%。DBT 的 E 为 0.44 mSv；FFDM 的 E 为 0.34 mSv。
乳腺癌筛查中使用 DBT 会增加筛查受检者的辐射剂量。
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