De Maeseneer M, Beeckman P, Osteaux M, Mattheus R, Hoste M, Bastaerts Y, Jong B
Department of Radiology, Sint-Andriesziekenhuis, Tielt, Belgium.
J Belge Radiol. 1992 Jun;75(3):173-8.
We compared the detection of clustered microcalcifications by means of conventional mammograms and by means of secondary digitized images with a spatial resolution of 2048 x 1684 pixels and a contrast resolution of 12 bit. A Receiver Operating Characteristic (ROC) study was carried out using a cadaver breast showing phantom microcalcifications. A set of 100 mammograms was evaluated by two experienced senior radiologists. The ROC scores obtained with the digital images were 10% lower than those obtained with the conventional images. This difference however does not reach statistical significance. The use of a digital zoom function based on pixel duplication is also investigated. This zoom function does not produce a change in the diagnostic accuracy of the digital method. Attention is also paid to the advantages and disadvantages encountered by the radiologists when working on the digital viewing system. The most important drawback seems to be that it is considerably more time consuming than the conventional procedure, and this is especially due to the long loading time of the images and to the absence of window and level preselections.
我们比较了通过传统乳腺X线摄影以及通过空间分辨率为2048×1684像素、对比度分辨率为12位的二次数字化图像来检测簇状微钙化的情况。使用一具带有模拟微钙化的尸体乳房进行了一项受试者操作特征（ROC）研究。一组100张乳腺X线照片由两位经验丰富的资深放射科医生进行评估。数字图像获得的ROC分数比传统图像获得的分数低10%。然而，这种差异未达到统计学显著性。还研究了基于像素复制的数字变焦功能的使用情况。这种变焦功能不会使数字方法的诊断准确性发生变化。还关注了放射科医生在使用数字阅片系统时遇到的优缺点。最重要的缺点似乎是它比传统程序耗时得多，这尤其归因于图像的加载时间长以及缺乏窗宽和窗位预选择功能。
