RADIOGRAPHIC SUBTRACTION BY COLOR ADDITION.
RADIOGRAPHIC SUBTRACTION BY COLOR ADDITION.
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通过颜色添加进行射线减影。
作者：
H. S. Frey;A. Norman
在血管造影研究中，减影技术常被用来强调血管树。这样做的摄影方法相当耗时，需要熟练的摄影师的服务。电子方法使用两台电视摄像机，其中一台产生正像，成本相当高。这里描述的过程使用了一个非常古老的颜色组合原理。当三原色，或一种颜色和它的补色，通过投影到屏幕上或用分光镜叠加起来时，它们就呈现出白色的外观。通过在光束中放置适当的黑白白色分色棱镜，可以显示全色图像。这种方法已经使用了很多年，在任何一本基础物理学教科书中都可以找到它的描述。我们使用了脑血管造影的动脉期和静脉期的X线照片，分别通过红色和绿色过滤器进行投影。原始X光片或由其制成的幻灯片可能是假的。
The radiographic subtraction technic is frequently used to accentuate the vascular tree in angiographic studies. The photographic method of doing this is rather time-consuming and requires the services of a skilled photographer. The electronic method which uses two television cameras, one yielding a positive image, is quite expensive. The procedure herein described uses a very old principle of combination of colors. When three primary colors, or a color and its complement, are added by being projected onto a screen or with beam-splitting mirrors, they give the appearance of white. By placing appropriate black-and-white color separation transparencies in the beams, full color pictures can be displayed. A description of this method, which has been employed for many years, may be found in any basic physics text. We have used radiographs from the arterial and venous phases of cerebral angiograms, projected respectively through red and green filters. The original radiographs, or slides made from them, may be p...