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Karim S. Karim,F. Taghibakhsh,G. Sanaie-Fard Sanaie-Fard,M. H. Izadi,T. Ottaviani 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
On-pixel amplifiers in amorphous silicon (a-Si) technology can offer increased pixel signal-to-noise ratios (SNR) compared to traditional switch based imaging pixels. Experiments reveal a reduction in readout noise and indicate that a-Si pixel amplifiers can meet the stringent requirements for digital X-ray fluoroscopy. However, larger input voltages can introduce non-linearities thereby reducing the pixel dynamic range. In this research, we investigate amplified pixel architectures that exhibit large signal linearity and consequently higher dynamic range. Gain, linearity, noise, metastability and area estimations of the amplified pixels indicate their applicability in large-area medical Xray imaging applications that require switching between low-exposure, real-time fluoroscopy and high-exposure chest radiography modes at a region of interest.