Characterization of current programmed amorphous silicon active pixel sensor readout circuit for dual mode diagnostic digital x-ray imaging

Nader Safavian; M. Yazdandoost; D. Wu; A. Sultana; M. H. Izadi; K. S. Karim; A. Nathan; J. A. Rowlands

doi:10.1117/12.813886

12 March 2009 Characterization of current programmed amorphous silicon active pixel sensor readout circuit for dual mode diagnostic digital x-ray imaging

Nader Safavian, M. Yazdandoost, D. Wu, A. Sultana, M. H. Izadi, K. S. Karim, A. Nathan, J. A. Rowlands

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725815 (2009) https://doi.org/10.1117/12.813886
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

A dual mode current-programmed, current-output active pixel sensor (DCAPS) in amorphous silicon (a-Si:H) technology is introduced for digital X-ray imaging, and in particular, for hybrid fluoroscopic and radiographic imagers. Here, each pixel includes an extra capacitor that selectively is coupled to the pixel capacitance to realize the dual mode behavior. Pixel structure, operation and characteristics are presented. The proposed DCAPS circuit was fabricated and assembled using an in-house bottom gate inverted staggered a-Si:H thin film transistor (TFT) process. Gain, lifetime, transient performance as well as noise analysis were carried out. The results are promising and demonstrate that the DCAPS enables dual mode X-ray imaging while compensating for the long term electrical and thermal stress related a-Si TFT threshold voltage (V_t) shift.

Citation Download Citation

Nader Safavian, M. Yazdandoost, D. Wu, A. Sultana, M. H. Izadi, K. S. Karim, A. Nathan, and J. A. Rowlands "Characterization of current programmed amorphous silicon active pixel sensor readout circuit for dual mode diagnostic digital x-ray imaging", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725815 (12 March 2009); https://doi.org/10.1117/12.813886

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