Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan; Department of Medical Imaging and Radiological Sciences, Chang Gung University, Taoyuan, Taiwan.
Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu 300, Taiwan.
Eur J Radiol. 2019 Aug;117:9-14. doi: 10.1016/j.ejrad.2019.05.014. Epub 2019 May 20.
The purpose of this study was to investigate the impact of the new American College of Radiology (ACR) digital mammography (DM) phantom in evaluating phantom image quality (IQ) and average glandular dose (AGD) in a nationwide survey on DM systems.
On-site surveys of 239 DM units were conducted in 2017 and 2018, and comparisons were made between ACR screen-film mammography (SFM) phantom and DM phantom for accessing phantom IQ and AGD. The phantom IQ was assessed using the weighted phantom score, considering the size of each detail.
When switching from SFM phantom to DM phantom, no significant difference was found in AGD (p = 0.06). The mean weighted phantom score was significantly higher for DM phantom than for SFM phantom in terms of fibers and specks, and so was the total weighted phantom score (DM phantom vs. SFM phantom: 8.61 ± 1.04 vs. 8.23 ± 0.77, p < 0.0001). The phantom IQ is thus more precise and can detect small differences when using DM phantom and investigating DM systems, especially for specks and fibers. However, the overall passing rate was lower for DM phantom (84.1%) than for SFM phantom (91.2%). This can be explained by the lower passing rate for mass (84.5%) with the DM phantom.
The ACR DM phantom provides better discernment to assess specks and fibers in DM systems. This study may serve as a reference for implementing a DM quality control program and when conducting large-scale surveys with the new DM phantom in the digital era.
本研究旨在探讨新的美国放射学院（ACR）数字乳腺摄影（DM）体模在评估 DM 系统的体模图像质量（IQ）和平均腺体剂量（AGD）的全国性调查中的影响。
2017 年和 2018 年对 239 个 DM 系统进行了现场调查，并对 ACR 屏片乳腺摄影（SFM）体模和 DM 体模进行了比较，以评估体模 IQ 和 AGD。使用加权体模评分评估体模 IQ，考虑到每个细节的大小。
从 SFM 体模切换到 DM 体模时，AGD 无显著差异（p=0.06）。DM 体模的纤维和斑点加权体模评分以及总加权体模评分均显著高于 SFM 体模（DM 体模与 SFM 体模：8.61±1.04 与 8.23±0.77，p<0.0001）。因此，使用 DM 体模和调查 DM 系统时，体模 IQ 更精确，能够检测到较小的差异，特别是对于斑点和纤维。然而，DM 体模的整体通过率（84.1%）低于 SFM 体模（91.2%）。这可以解释为 DM 体模中肿块的通过率较低（84.5%）。
ACR DM 体模提供了更好的辨别力，可用于评估 DM 系统中的斑点和纤维。本研究可为实施 DM 质量控制计划以及在数字时代使用新的 DM 体模进行大规模调查提供参考。
