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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...
To the aim of developing an X-ray imager based on a scintillator coupled to an organic photodetector, we fabricated and tested a detector pixel whose active material is a blend of squaraine dyes and Phenyl-C61-Butyric-Acid-Methyl-Ester (PCBM), processed to obtain a detector thickness of 2??m and a leakage current, at the operating voltage, below 10nA/cm2. The detector was coupled to a CsI(Tl) scintillator...
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