Magnification mammography: a comparison of full-field digital mammography and screen-film mammography for the detection of simulated small masses and microcalcifications
Magnification mammography: a comparison of full-field digital mammography and screen-film mammography for the detection of simulated small masses and microcalcifications
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DOI：
10.1007/s00330-002-1356-8
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发表时间：
2002-09-01
影响因子：
5.9
通讯作者：
Grabbe, EH
中科院分区：
文献类型：
--
作者：
Hermann, KP;Obenauer, S;Grabbe, EH
本研究的目的是比较全场数字乳腺摄影(FFDM)系统和传统的屏幕-胶片乳腺摄影(SFM)系统在放大模式下对模拟小肿块和微钙化的可探测性。所有图像均以1.8倍的放大倍数获得。当辐射剂量分别为SFM图像的1.39、1.0、0.7、0.49和0.24倍时，获得FFDM型图像。对比细节体模被用来比较使用四种可选的强迫选择阅读器研究和三种阅读器对模拟病变的检测。正确观察率(COR)计算为正确识别的病变占模拟病变总数的比例。对所有数字图像进行软拷贝阅读。用数字系统获取的直接放大图像显示出比用传统系统获取的对象对比度阈值更低的对象对比度阈值。在相同的辐射剂量下，数字系统提供的COR(0.95)显著高于屏幕-胶片系统(0.82)。对于模拟的微钙化，相应的差异为0.90到0.72。数字系统允许以屏幕胶片所用辐射剂量的40%对屏幕胶片进行同等检测。即使在较低的辐射剂量下，数字放大图像在检测模拟的小肿块和微钙化方面也优于屏幕-胶片放大图像。
The objective of this study was a comparison of a full-field digital mammography (FFDM) system and a conventional screen-film mammography (SFM) system with respect to the detectability of simulated small masses and microcalcifications in the magnification mode. All images were obtained using 1.8 times magnification. The FFDM images were obtained at radiation dose levels of 1.39, 1.0, 0.7, 0.49 and 0.24 times that of the SFM images. A contrast-detail phantom was used to compare the detection of simulated lesions using a four alternative forced-choice reader study with three readers. The correct observation ratio (COR) was calculated as the fraction of correctly identified lesions to the total number of simulated lesions. Soft-copy reading was performed for all digital images. Direct magnification images acquired with the digital system showed a lower object contrast threshold than those acquired with the conventional system. For equal radiation dose, the digital system provided a significantly increased COR (0.95) compared with the screen-film system (0.82). For simulated microcalcifications, the corresponding difference was 0.90 to 0.72. The digital system allowed equal detection to screen-film at 40% of the radiation dose used for screen film. Digital magnification images are superior to screen-film magnification images for the detection of simulated small masses and microcalcifications even at a lower radiation dose.