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首页> 外文期刊>Sensors Journal, IEEE >Pixel Readout Circuit for X-Ray Imagers
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Pixel Readout Circuit for X-Ray Imagers

机译:X射线成像仪的像素读出电路

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摘要

This paper describes the per-pixel readout circuit of an X-ray imaging matrix and compares it to other solutions. The per-pixel readout circuit consists of a digital pixel sensor array constituted by a photodiode and a one-bit first-order sigma-delta A/D converter for each pixel. The output of each pixel is a digital bit stream, containing information about the intensity of the light that falls into its photodiode. The sigma-delta A/D converters use only 19 small size MOSFETs and one capacitor. In order to perform the X-ray detection, a scintillator crystal must be placed above each photodiode for converting the X-ray energy into visible light with wavelengths near to the quantum efficiency peak of the photodiodes. Then, the visible light is converted into electronic charges by each photodiode, which is part of digital pixel sensor. The comparison between the solution presented here and other solutions show that the implemented circuit is simpler and its resolution is similar or even superior.
机译:本文介绍了X射线成像矩阵的每像素读出电路,并将其与其他解决方案进行了比较。每像素读出电路由数字像素传感器阵列组成,该阵列由光电二极管和每个像素的一位一阶一阶sigma-delta A / D转换器组成。每个像素的输出是一个数字位流,其中包含有关落入其光电二极管的光强度的信息。 sigma-delta A / D转换器仅使用19个小尺寸MOSFET和一个电容器。为了执行X射线检测,必须在每个光电二极管上方放置一个闪烁体晶体,以将X射线能量转换为波长接近光电二极管量子效率峰值的可见光。然后,可见光被每个光电二极管转换为电荷,这是数字像素传感器的一部分。此处介绍的解决方案与其他解决方案之间的比较表明,所实现的电路更简单,其分辨率相似甚至更高。

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