摘要:
The invention concerns an input screen scintillator for an X-ray image intensifier tube. This tube comprises light-conductive cesium iodide needles formed on an electrically conductive substrate. According to the invention, each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needles and allows an identical potential level in the coating material as in the substrate towards the inside of said needles. The coating can enhance the efficiency and resolution of image intensifier tubes. The invention has applications in the field of X-ray imagery.
摘要:
An input screen scintillator for an X-ray image intensifier tube. The tube includes light conductive cesium iodide needles formed on an electrically conductive substrate. Each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needle toward the inside of the needle. This coating can enhance the efficiency and resolution of the image intensifier tube.
摘要:
An image intensifying tube, such as a image intensifying tube which converts X-rays into a visible image, comprises a curved input screen which comprises a substrate that receives input radiation and a photocathode supported on the substrate, and an output screen which converts the electrons emitted by the photocathode into a visible image. In order to compensate for changes in luminosity due to the curvature of the input screen, an intermediary layer of radially variable thickness is deposited between the substrate and the photocathode. The intermediary layer is made from a material, such as indium oxide (In.sub.2 O.sub.3), which modifies the electron emitting characteristics of the photocathode as a function of the thickness the intermediary layer. Thus, a thicker intermediary layer near the center of the input screen will compensate for reduced luminosity at the edges of the screen.
摘要翻译:图像增强管,例如将X射线转换成可视图像的图像增强管,包括弯曲输入屏幕,其包括接收输入辐射的基板和支撑在基板上的光电阴极,以及输出屏幕,其转换电子 由光电阴极发射成可见图像。 为了补偿由于输入屏幕的曲率引起的亮度变化,可以在衬底和光电阴极之间沉积径向可变厚度的中间层。 中间层由诸如氧化铟(In 2 O 3)的材料制成,其将作为中间层的厚度的函数改变光电阴极的电子发射特性。 因此,靠近输入屏幕中心的较厚的中间层将补偿屏幕边缘处的降低的亮度。
摘要:
An input screen for radiological image intensifier tube that includes a scintillator (12), deposited on an aluminum substrate (10), which converts incident X-photons into visible photons which then go on to excite a photocathode (16). Previously, the luminous photons produced by the scintillator were emitted towards and were reflected by the aluminum layer; but this reflection reduces the resolution. According to the invention, in order to suppress this reflection, an input screen--in which a thin layer (20), transparent or slightly absorbent to the wavelengths emitted by the scintillator and or size to cause an anti-reflecting effect--is interposed between the aluminum substrate and the scintillator. Choices of anti-reflecting slightly absorbent layer include indium oxide, or alternatively antimony, tin or bismuth oxide, or a combination of these oxides, such as indium-tin oxide. The thickness is from a few hundred to a few thousand angstroms.