Three-TFT image sensor for real-time digital X-ray imaging |
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| Authors: | Safavian N. Chaji G.R. Nathan A. Rowlands J.A. |
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| Affiliation: | Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Ont., Canada; |
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| Abstract: | A new current-programmed, current-output active TFT image sensor suitable for real-time X-ray imaging (e.g. fluoroscopy) using hydrogenated amorphous silicon (a-Si:H) thin-film-transistor (TFT) technology is introduced. The proposed pixel circuit can successfully compensate for characteristic variations such as mobility and threshold voltage shift in a-Si:H TFTs. Simulation and measurement results show that high on-pixel amplification can be accomplished with this pixel circuit. |
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