Plewes D, Johns H E
Phys Med Biol. 1978 Nov;23(6):1060-75. doi: 10.1088/0031-9155/23/6/002.
The effect of Mylar foil thickness on the appearance of ionography images has been investigated. Approximate expressions for the depletion width of strips and halfplanes of charge are given with supporting experimental measurements. In microdensitometer traces of charged strips and halfplanes the density is shown to be proportional to the vertical field profile of the charge pattern near the Mylar. This work suggests a simple means of altering edge contrast for ionography by using different thicknesses of Mylar. Ionography images of a hand phantom illustrate this effect.
研究了聚酯薄膜厚度对离子成像图像外观的影响。给出了带电条带和电荷半平面耗尽宽度的近似表达式，并辅以实验测量。在带电条带和半平面的微密度计迹线中，密度显示与聚酯薄膜附近电荷图案的垂直场分布成正比。这项工作提出了一种通过使用不同厚度的聚酯薄膜来改变离子成像边缘对比度的简单方法。手部模型的离子成像图像说明了这种效果。
