Vanselow K, Heuck F
Rofo. 1975 May;122(5):453-6. doi: 10.1055/s-0029-1230112.
The physical basis of quotient densitometry is described. All stages are discussed, beginning with the production of the x-rays, their attenuation by the patient, their effect on the radiographic film, and the evaluation of the film by projection and its measurements by a photo cell in a Wheatstone bridge. Two values were obtained, one consisting of the signal together with background fog, the other of the background alone. By an analysis of the relationships of these measurements, obtained from specially separated points on the radiograph, it is possible to eliminate artefacts to a large extent.
描述了商密度测定法的物理基础。讨论了所有阶段，从X射线的产生开始，到患者对其的衰减、对X射线胶片的影响，以及通过投影对胶片的评估和在惠斯通电桥中由光电池进行的测量。获得了两个值，一个由信号加上背景雾组成，另一个仅为背景。通过分析从X射线照片上特别分开的点获得的这些测量值之间的关系，在很大程度上可以消除伪影。
