SOFT COPY DISPLAY FOR DIGITAL MAMMOGRAPHY

该方案解决了数字乳房X光摄影的图像显示问题：灰度级、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和特殊的演示方法，数字乳房X光照片的软拷贝演示可以变得与硬拷贝一样，以可视化正常和病理特征。所提出的图像处理将弥补显示器在灰度、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。拟议的特别演示将包括两个主要视图，即整个乳房X光照片的低分辨率视图，以及结合漫游和缩放的部分乳房X光照片的高分辨率视图。快速算法将对数据集执行均衡，以实现高对比度放大。用于特定显示设备的软拷贝图像的图像处理的策略如下：生成软件以获得软拷贝演示的两个视图：低空间分辨率的一个，其中可以看到整个乳房X光照片，以及高分辨率的一个，其中在相当大的窗口中的任何时间只能看到乳房X光照片的一部分，但是相当积极地增强了对比度。在软拷贝设备的图像质量低于接受的硬拷贝的情况下，在软拷贝中恢复物理图像质量。通过对图像中的高频分量进行一些额外的增强来补偿较低亮度和较小亮度动态范围的影响。在这项研究中，我们将使用基于数字化胶片屏幕的乳房X光照片以及来自数字探测器的乳房X光照片。基于胶片屏幕的乳房X光照片将被数字化到50微米的分辨率。数字化的乳房X光照片以及来自数字数字探测器的乳房X光照片都将经过图像处理，并在空间分辨率为2048x2560的两个CRT上显示。ROC的一项研究将这种软拷贝显示与在传统灯箱上观看原始乳房X光照片进行比较。

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.