Meyblum E, Gardavaud F, Dao T-H, Fournier V, Beaussart P, Pigneur F, Baranes L, Rahmouni A, Luciani A
AP-HP, Henri-Mondor-Albert-Chenevier Group, Department of Medical Imaging, 94010 Créteil, France.
AP-HP, Henri-Mondor-Albert-Chenevier Group, Department of Medical Imaging, 94010 Créteil, France; University of Paris Est Créteil, Faculty of Medicine, 94010 Créteil, France.
Diagn Interv Imaging. 2015 Sep;96(9):931-9. doi: 10.1016/j.diii.2014.12.010. Epub 2015 Apr 20.
To evaluate using phantom study the average glandular dose (AGD) and image quality in breast tomosynthesis.
The study was performed with a full-field digital mammography system (Mammomat Inspiration(®), Siemens, Erlangen, Germany) combined with tomosynthesis equipment (3D). For AGD evaluation, polymethyl methacrylate (PMMA) plates and a dosimeter were used to directly measure the absorbed doses in 2D and in 3D. The doses were then compared to the doses displayed on the equipment using the Mann-Whitney test. Three phantoms, accredited for 2D digital mammography (MTM 100, ACR RMI 156, BR3D), were imaged three times in 2D then in 3D. For each acquisition, the AGD was recorded. For image quality assessment, scores, defined by the rate of visible inserts, obtained for each acquisition both in 2D and in 3D, and for each phantom, were compared (Kruskall-Wallis and post-hoc Dunn tests).
There was no significant difference between the measured and displayed AGD, both in 2D and in 3D imaging (P>0.05). With identical acquisition parameters, AGD were significantly greater in 3D than in 2D P<0.01). For phantoms MTM 100 and ACR RMI 156, there was no significant difference between the rate of visible inserts in 2D and in 3D (P=0.06 and P=0.36, respectively). However for phantom BR3D, the rate was significantly higher in 3D than in 2D (P<0.0001).
Doses are significantly greater in 3D than in 2D. With tomosynthesis, out of the three phantoms tested, only phantom BR3D showed a higher rate of visible inserts.
通过体模研究评估乳腺断层合成中的平均腺体剂量（AGD）和图像质量。
本研究使用全视野数字乳腺摄影系统（Mammomat Inspiration(®)，西门子，德国埃尔朗根）结合断层合成设备（3D）进行。为评估AGD，使用聚甲基丙烯酸甲酯（PMMA）板和剂量计直接测量二维和三维中的吸收剂量。然后使用曼-惠特尼检验将这些剂量与设备上显示的剂量进行比较。对三个经二维数字乳腺摄影认证的体模（MTM 100、ACR RMI 156、BR3D）先进行三次二维成像，然后进行三次三维成像。每次采集时，记录AGD。为评估图像质量，比较每次采集在二维和三维中以及每个体模下由可见插入物率定义的分数（克鲁斯卡尔-沃利斯检验和事后邓恩检验）。
在二维和三维成像中，测量的AGD与显示的AGD之间均无显著差异（P>0.05）。在相同采集参数下，三维中的AGD显著高于二维（P<0.01）。对于体模MTM 100和ACR RMI 156，二维和三维中可见插入物率之间无显著差异（分别为P=0.06和P=0.36）。然而，对于体模BR3D，三维中的率显著高于二维（P<0.0001）。
三维中的剂量显著高于二维。在断层合成中，在所测试的三个体模中，只有体模BR3D显示出更高的可见插入物率。
