Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Reexamination Certificate
2007-12-04
2007-12-04
Porta, David (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
Reexamination Certificate
active
11412396
ABSTRACT:
A flat panel x-ray imager exhibiting reduced ghosting effects and overvoltage protection by appropriate leakage current characteristics of the thin-film transistor array. A top electrode of a suitable material is directly on an amorphous selenium-based charge generator layer allowing charge transport across the layer, thereby reducing ghosting. Alternatively, a non-insulating organic layer may be between the top electrode and the charge generating layer. The thin-film transistors have leakage current that rises relatively slowly with voltage across the transistor within a range that matches exposure through an object being imaged but rises at a sufficiently higher rate within a higher range to provide protection even when a corresponding region of the charge generator layer receives greater amounts of x-rays. A voltage is applied to the top electrode. This voltage may be within the range of 500 V to 2,000 V.
REFERENCES:
patent: 5132541 (1992-07-01), Conrads et al.
patent: 5184018 (1993-02-01), Conrads et al.
patent: 5198673 (1993-03-01), Rougeot et al.
patent: 5319206 (1994-06-01), Lee et al.
patent: 5396072 (1995-03-01), Schiebel et al.
patent: 5436101 (1995-07-01), Fender et al.
patent: 5528043 (1996-06-01), Spivey et al.
patent: 5598004 (1997-01-01), Powell et al.
patent: 5852296 (1998-12-01), Tsukamoto et al.
patent: 5942756 (1999-08-01), Tran
patent: 6243441 (2001-06-01), Zur
patent: 6353229 (2002-03-01), Polischuk et al.
patent: 6469312 (2002-10-01), Agano
patent: 2184667 (1998-03-01), None
patent: 0826983 (1998-03-01), None
patent: WO9622616 (1996-07-01), None
Yorker J. et al., “Characterization of a full field mammography detector based on direct x-ray conversion in selenium.” Proc. SPIE 4682, 21-29 (2002).
Zhao W. et al., “Digital radiology using active matrix readout of amorphous selenium detectors with high voltage protection.” Med Phys 25 (4), pp. 539-549 (1998).
Lee D. et al., “A new digital detector for projection radiography,” SPIE vol. 2432, pp. 237-249; (1995).
Zhao W. et al., “A large area solid-state detector for radiology using amorphous selenium,” SPIE Medical Imaging, vol. 1. 1651, pp. 134-143, (1992); and.
Polischuk B. et al., “Selenium direct converter structure for static and dynamic x-ray detection im medical imaging applications,” SPIE Conference on Physics of Medical Imaging, San Diego, CA, Feb. 1998, SPIE vol. 3336, pp. 494-504.
Bogdanovich Snezana
Cheung Lawrence
Ingal Elena
Williams Cornell L.
Cooper & Dunham LLP
Hologic Inc.
Porta David
Taningco Marcus H
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