Schleicher A, Tillmann B, Zilles K
Microsc Acta. 1980 Jul;83(3):189-96.
A method for the quantitative evaluation of X-rays is described. The image is decomposed into individual image points by a mechanical scanning procedure, and at each image point the area fraction of a measuring field not covered by silver grains is determined with an image analyzer. This parameter is interpreted as representing a value corresponding to a specific degree of film blackness. The relationship between the measured value and the X-ray absorption is described by standard curves. With the aid of an aluminum scale, the measured value can be expressed directly by the thickness of an aluminum equivalent with a corresponding X-ray absorption. Details about the adjustment of the image analyzer for detecting the silver grains, the resolution of different degrees of X-ray absorption, as well as the computer-controlled scanning procedure are described. An example demonstrates its applicability to analyze the density distribution of bony tissue around the human humero-ulnar joint. The procedure is not limited to the evaluation of X-rays, but is applicable whenever silver grains can be detected in a film layer by an image analyzer.
描述了一种用于X射线定量评估的方法。通过机械扫描程序将图像分解为单个图像点，并使用图像分析仪在每个图像点确定未被银颗粒覆盖的测量场的面积分数。该参数被解释为代表与特定胶片黑度程度相对应的值。测量值与X射线吸收之间的关系由标准曲线描述。借助铝标尺，测量值可以直接用具有相应X射线吸收的铝等效物的厚度来表示。描述了关于调整图像分析仪以检测银颗粒、不同程度X射线吸收的分辨率以及计算机控制的扫描程序的详细信息。一个例子展示了其在分析人肱骨-尺骨关节周围骨组织密度分布方面的适用性。该程序不仅限于X射线评估，而且在图像分析仪能够在胶片层中检测到银颗粒的任何情况下都适用。
