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http://dx.doi.org/10.9718/JBER.2008.29.5.392

Optimal Design of a-Si TFT Array for Minimization of Data-line Capacitance and Its Implementation  

Kim, C.W. (DRTECH Corp.)
Yoon, J.K. (DRTECH Corp.)
Kim, S.Y. (Department of Diagnostic Radiology, School of Medicine, Ajou University)
Kim, J.H. (Department of Radiology, Seoul National University College of Medicine)
Publication Information
Journal of Biomedical Engineering Research / v.29, no.5, 2008 , pp. 392-399 More about this Journal
Abstract
Thin-film transistor (TFT) arrays for an x-ray detector require quite different design concept from that of the conventional active-matrix liquid crystal devices (AM-LCDs). In this paper anew design of TFT array which uses only SiNx for passivation layer is described to meet the detector performance and the product availability simultaneously. For the purpose of optimizing the design parameters of the TFT array, a Spice simulation was performed. As a result, some parameters, such as the TFT width, the data line capacitance, and the storage capacitance, were able to be fixed. The other parameters were decided within a permissible range of the TFT process especially the photolithography process and the wet etch process. Then we adapted the TFT array which had been produced by the proposed design to our prototype model (FDXD-1417 and evaluated it clinically by comparing with a commercial model (EPEX, Hologic, Beford, USA). The results say that our prototype model is slightly better than EPEX system in chest PA images. So we can prove the technical usefulness and the commercial values of the proposed TFT design.
Keywords
flat-panel; detector; TFT; clinical; evaluation;
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1 Z.S Huang, G. De Crescenzo, J.A. Rowlands, "Signal and Noise Analysis Using Transmission Line Model for Larger Area Flat-Panel X-ray Imaging Sensors", Proc. Of SPlE Vol 3659, Medical Imaging, 1999,pp76-89
2 D. L. Lee, L. K. Cheung, L.S. Jeromin, "A New Digital Detector for Projection Radiology," Medical Imaging: Proc. SPIE 2432, pp. 237-249, 1995
3 W. Zhao, J. Law, D. Waechter, Z. Huang, J. A. Rowlands, "Digital radiology using active matrix readout of amorphous selenium: Detectors with high voltage protection", Med. Physics. 25(4), April 1998, 539-549   DOI   ScienceOn