Format alterations in CCD based electro-optic X-ray detectors
Format alterations in CCD based electro-optic X-ray detectors
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基于 CCD 的电光 X 射线探测器的格式更改
DOI：
10.1016/0168-9002(86)90145-2
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发表时间：
1986
影响因子：
1.4
通讯作者：
S. Gruner
中科院分区：
文献类型：
--
作者：
H. Deckman;S. Gruner
二维X射线图案可以通过将薄荧光屏的X射线诱导发光耦合到CCD来成像。由于荧光图像和CCD的尺寸可能不同，因此通常需要通过放大或缩小机制将两者耦合，即，以改变耦合的形式。结果表明，当通过透镜完成格式改变时，组合的透镜转移和磷光体转换效率将图像的缩小限制为0.5 - 0.1×。透镜中的光散射和来自CCD的光反射产生信号依赖性背景，其限制了定量成像的有用动态范围。虽然这些限制可以通过使用光纤缩束来克服，但是目前可用的光纤缩束引入了图像失真，这对于许多应用来说是不可接受的。格式改变的第三种方法涉及在磷光体和CCD之间插入减少的图像增强器;然而，实际增强器的电子光学中的缺陷也引入失真和依赖于信号的背景。各种混合动力系统进行评估。
Two-dimensional X-ray patterns may be imaged by coupling the X-ray induced luminescence of thin phosphor screens to a CCD. Because the phosphor image and the CCD may differ in size, it is often necessary to couple the two via magnifying or reducing mechanisms, i.e., to alter the format of the coupling. It is shown that when format alteration is accomplished by a lens, the combined lens transfer and phosphor conversion efficiencies limit the reduction of the image to 0.5−0.1×. Light scattering in the lens and reflection of light from the CCD yield a signal dependent background which limits the useful dynamic range for quantitative imaging. Although these limitations can be overcome by the use of fiberoptic reducing bundles, currently available fiberoptic reducing bundles introduce image distortions which are unacceptable for many applications. A third method of format alteration involves the insertion of reducing image intensifiers between the phosphor and the CCD; however, imperfections in the electron optics of practical intensifiers also introduce distortions and a signal dependent background. Various hybrid systems are evaluated.