Biegała Michał, Batolik Agata
Faculty of Medicine, Department of Medical Imaging Technology, Medical University of Lodz, Narutowicza 60, 90-136, Lodz, Poland.
Department of Medical Physics, Copernicus Memorial Hospital in Lodz Comprehensive Cancer Center and Traumatology, Lodz, Poland.
Radiol Phys Technol. 2025 Sep 2. doi: 10.1007/s12194-025-00958-3.
Image quality, in addition to radiation dose, is the most important physical parameter in digital mammography. Image quality should be periodically monitored using the CDMAM phantom. The aim of this study is to investigate the effect of the number of analyzed images on the result of threshold image contrast measurements using the CDMAM phantom in different versions. The images obtained using two versions of the CDMAM phantom, i.e., 3.4 and 4.0, were analyzed. The image analysis was performed and repeated 10 times for 2, 4, 6, 8, 12, 16, 24, and 32 images from a pool of 43 images, separately for each phantom. For the CDMAM 3.4 phantom, a statistical difference was demonstrated between the following groups: S2 vs S6 (p < 0.006), S6 vs S16 (p < 0.001), S6 vs S24 (p < 0.002), S6 vs S32 (p < 0.021), S8 vs S16 (p < 0.019), S8 vs S24 (p < 0.048). For the CDMAM 4.0 phantom, a statistically significant difference was demonstrated between all groups and the N2 group (p < 0.000). For the CDMAM 3.4 phantom, the most favorable number of images required for analysis cannot be clearly determined. For the CDMAM 4.0 phantom, it is recommended to perform 24 images for analysis. Particular attention should be paid when determining the threshold image contrast for a disk diameter of 0.1 mm, as this parameter is used during exposure automation control.
除辐射剂量外，图像质量是数字乳腺摄影中最重要的物理参数。应使用CDMAM体模定期监测图像质量。本研究的目的是调查在不同版本的CDMAM体模中，分析图像数量对阈值图像对比度测量结果的影响。分析了使用两个版本的CDMAM体模（即3.4版和4.0版）获得的图像。从43幅图像中分别针对每个体模对2、4、6、8、12、16、24和32幅图像进行图像分析，并重复进行10次。对于CDMAM 3.4体模，在以下组之间显示出统计学差异：S2与S6（p＜0.006）、S6与S16（p＜0.001）、S6与S24（p＜0.002）、S6与S32（p＜0.021）、S8与S16（p＜0.019）、S8与S24（p＜0.048）。对于CDMAM 4.0体模，在所有组与N2组之间显示出统计学显著差异（p＜0.000）。对于CDMAM 3.4体模，无法明确确定分析所需的最适宜图像数量。对于CDMAM 4.0体模，建议进行24幅图像分析。在确定0.1毫米盘直径的阈值图像对比度时应特别注意，因为此参数用于曝光自动控制期间。
