Non-linear CT windows

John M. Gomori , Israel Steiner
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引用次数: 18

Abstract

The display of computerized tomographic (CT) data requires data compression because of the limited shades of grey which the eye can differentiate. This may lead to information loss which can be minimized by a more efficient utilization of the available levels of grey than that afforded by conventional linear windows. Automated histogram equalization for grey level assignment has not been satisfactory because of the underlying assumption that the information content at any given CT level is proportional to the number of pixels at that level. For four different anatomic regions; the lumber spine, abdomen, brain and chest, an empiric graph of the clinical information content vs CT levels was integrated to yield the shape of a graph assigning shades of grey vs CT level i.e. a non-linear window. This non-linear window curve was utilized in the same manner as the linear window, namely the window center and width were under the direct control of the observer through the window center and width knobs. Each non-linear window was implemented on images of its anatomic region and interactively optimized on the screen till a maximal display of information was obtained. These optimal non-linear windows compared favorably with linear windows in most cases. This method provides the means to display more information on a CT image with no extra processing time, additional equipment or special training.

非线性CT窗口
由于人眼所能分辨的灰度有限,计算机断层扫描(CT)数据的显示需要数据压缩。这可能导致信息损失,而这种损失可以通过比传统线性窗口更有效地利用可用的灰度级别来最小化。用于灰度分配的自动直方图均衡化并不令人满意,因为潜在的假设是任何给定CT水平上的信息内容与该水平上的像素数量成正比。对于四个不同的解剖区域;在腰椎、脊柱、腹部、大脑和胸部,临床信息内容与CT水平的经验图被整合,以产生分配灰色阴影与CT水平的图的形状,即非线性窗口。这种非线性窗口曲线的利用方式与线性窗口相同,即通过窗口中心和宽度旋钮直接控制窗口中心和宽度。每个非线性窗口在其解剖区域的图像上实现,并在屏幕上进行交互优化,直到获得最大的信息显示。在大多数情况下,这些最佳的非线性窗口比线性窗口更有利。这种方法提供了在CT图像上显示更多信息的手段,无需额外的处理时间,额外的设备或特殊培训。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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