Nab H W, Karssemeijer N, Van Erning L J, Hendriks J H
Department of Diagnostic Radiology, University Hospital Nijmegen, The Netherlands.
Med Inform (Lond). 1992 Apr-Jun;17(2):125-31. doi: 10.3109/14639239209085015.
Observer performance tests were conducted to study the visibility of malignancies in digital mammography. Detectabilities of tumours and of microcalcifications were studied separately. For this purpose two sets of images were used, one for tumours consisting of 150 mammograms and one for microcalcifications containing 120 mammograms. Images were digitized at a resolution of 2048 x 2048 pixels using a 12-bit CCD camera. Conventional film mammograms were read on a lightbox, whereas digital mammograms were viewed on a high-resolution monitor. Two experienced radiologists read both sets independently, and ranked their judgements about the presence or absence of tumours or microcalcifications on a confidence-rating scale. Results were evaluated using receiver operating characteristic (ROC) analysis. No statistical differences were found between judgements based on conventional and digitized mammography.
进行了观察者性能测试，以研究数字乳腺摄影中恶性肿瘤的可见性。分别研究了肿瘤和微钙化的可检测性。为此使用了两组图像，一组用于包含150幅乳腺X线照片的肿瘤研究，另一组用于包含120幅乳腺X线照片的微钙化研究。使用12位CCD相机以2048×2048像素的分辨率对图像进行数字化处理。传统胶片乳腺X线照片在观片灯上阅读，而数字乳腺X线照片在高分辨率显示器上查看。两位经验丰富的放射科医生独立阅读两组照片，并根据置信度等级对他们关于肿瘤或微钙化是否存在的判断进行排名。使用接受者操作特征（ROC）分析对结果进行评估。基于传统乳腺摄影和数字化乳腺摄影的判断之间未发现统计学差异。
