SOFT COPY DISPLAY FOR DIGITAL MAMMOGRAPHY

该方案解决了数字乳房x线摄影图像显示的问题：灰度、显示亮度、动态范围、空间分辨率和对比度分辨率。我们希望证明，通过适当的图像处理以及特殊的呈现方法，数字乳房x线照片的软拷贝呈现可以等同于可视化正常和病理特征的硬拷贝。所提出的图像处理将弥补显示在灰度、显示亮度、动态范围、空间分辨率和对比度分辨率方面的不足。本次特别展示将包括两个主要视图，一个是整个乳房x光片的低分辨率视图，另一个是乳房x光片部分的高分辨率视图，并结合漫游和缩放功能。快速算法将执行数据集的均衡，以允许高对比度的简化。对特定显示设备的软拷贝图像进行图像处理的策略如下：生成软件以获得软拷贝呈现的两种视图：低空间分辨率的视图，可以看到整个乳房x光片；高分辨率的视图，在一个相当大的窗口中，每次只能看到乳房x光片的一部分，但对比度得到了相当积极的增强。当软拷贝设备的图像质量低于可接受的硬拷贝时，在软拷贝中恢复物理图像质量。通过对图像中的高频成分进行一些额外的增强来补偿低亮度和小亮度动态范围的影响。在这项研究中，我们将使用基于胶片屏幕的数字化乳房x光片以及来自数字探测器的乳房x光片。基于胶片屏幕的乳房x光片将被数字化到50微米的分辨率。数字化的乳房x线照片和数字探测器的乳房x线照片都将经过图像处理，并在两台空间分辨率为2048 x 2560的crt上显示。一项ROC研究将比较这种软拷贝显示与在传统灯箱上观看原始乳房x光片。

This proposal addresses the problem of image display for digital mammography: grey scale, display luminance, dynamic range, spatial resolution and contrast resolution. We wish to demonstrate that with proper image processing as well as with special presentation methods, soft-copy presentations of digital mammograms can become equivalent to hard-copy for visualizing normal and pathologic features. The image processing proposed will compensate for the deficiencies of the display with respect to grey scale, display luminance, dynamic range, spatial resolution and contrast resolution. The proposed special presentation will include two main views, a low resolution view of the whole mammogram, and a high resolution view of a portion of the mammogram in conjunction with roaming and zooming . Fast algorithms will perform equalization of the data set to permit high contrast emplification. The strategy to be used for the image processing of the soft-copy images for a specific display device is as follows: Generate software to obtain two views of soft-copy presentation: a low spatial resolution one, where the whole mammogram is seen, and a high resolution one where only a portion of the mammogram is seen at any one time in a fairly large window, but fairly aggressively contrast enhanced. Restore the physical image quality in the soft-copy wherever the image quality of the soft-copy device is inferior to the accepted hard-copy. Compensate for the effects of lower luminance and small luminance dynamic range by some additional enhancement of the higher-frequency components in the image. We will use digitized film-screen based mammograms as well as mammograms from digital detectors for this study. The film- screen based mammograms will be digitized to a resolution of 50 micrometers. Both the digitized mammorgrams as well as the mammograms from digital digital detectors will be image processed and displayed on two CRTs with spatial resolutions of 2048 x 2560. An ROC study will compare this soft-copy display with viewing of the original mammograms on a conventional light box.