Mammography has a crucial role in breast cancer detection. The National Cancer Institute (INCA) estimates that 29.7% of the cancer cases in Brazil are related specifically to the breast. It is necessary to evaluate the mean glandular dose with a new solid-state detector in a digital radiography system, utilizing PMMA phantoms and spacers for different thicknesses. The Selenia Dimensions (Hologic, Bedford) direct radiography (DR) system can perform full-field digital mammographies through digital detectors. This system uses new technologies, such as the digital breast tomosynthesis system (DBT), and employs a sequence of projections acquired over the breast, resulting in images with low contrast. The estimation of breast dose is an important part of mammographic quality control for x-ray mammography. Nevertheless, there are currently no standard protocols for the dosimetry of breast imaging in 3D. Additionally, a x-ray spectra function is crucial to measure a considerable output in x-ray spectrometry. The purpose of this work was to assess the mean glandular dose (MGD) and the spectra in slabs of polymethyl methacrylate (PMMA) and breast equivalent thickness through digital mammography using four experiments: a Hologic Selenia Dimensions mammograph with a solid-state detector; a spectrometer (only for the spectra, in this case); a clinical COMET x-ray tube with a solid-state detector; and the MCNPX code. References recommend that the real environments that work well with digital mammography are in the following tube voltages: 25 kVp; 26 kVp; 28 kVp; 31 kVp and 33 kVp. Taking into account several thicknesses of PMMA, the results of both the MGD in metrological, clinical and simulated cases were in accordance with the references, from 30 mm of PMMA. All the spectra for all cases have indicated good agreement with the references.

乳房 X 光检查在乳腺癌检测中起着至关重要的作用。国家癌症研究所 (INCA) 估计，巴西 29.7% 的癌症病例与乳房有关。有必要在数字射线照相系统中使用新的固态探测器评估平均腺体剂量，利用 PMMA 体模和不同厚度的垫片。Selenia Dimensions (Hologic, Bedford) 直接射线照相 (DR) 系统可以通过数字探测器执行全场数字乳房 X 光检查。该系统使用新技术，如数字乳房断层合成系统 (DBT)，并采用在乳房上采集的一系列投影，从而产生低对比度的图像。乳房剂量的估计是 X 射线乳房 X 线摄影质量控制的重要组成部分。尽管如此，目前没有用于 3D 乳房成像剂量测定的标准协议。此外，X 射线光谱功能对于测量 X 射线光谱法中的大量输出至关重要。这项工作的目的是评估平均腺体剂量 (MGD) 和聚甲基丙烯酸甲酯 (PMMA) 片中的光谱以及通过数字乳房 X 线照相术使用四个实验的乳房等效厚度：带固态检测器的 Hologic Selenia Dimensions 乳房X线照相术；光谱仪（仅用于光谱，在这种情况下）；带有固态探测器的临床 COMET X 射线管；和 MCNPX 代码。参考文献推荐数字乳房X线摄影工作良好的真实环境是在以下管电压中：25 kVp；26 千伏；28 千伏；31 kVp 和 33 kVp。考虑到PMMA的几种厚度，计量、临床和模拟病例中的 MGD 结果均与参考文献一致，来自 30 mm PMMA。所有情况的所有光谱都表明与参考文献具有良好的一致性。