Wide dynamic range digital imaging system and method

G - Physics – 01 – T

Patent

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G01T 1/24 (2006.01) G01T 1/202 (2006.01) G01T 1/29 (2006.01) H05G 1/64 (2006.01)

Patent

CA 2451642

A method and apparatus for digital x-ray imaging utilizing an imaging device (10) including a top electrode layer (12), a dielectric layer (14), a sensor (16) comprising a photoconductive layer and a plurality of pixels including a charge collecting electrode (24), a thin film transistor (TFT) readout matrix (18) connected to the charge collection electrodes (24), and a variable power supply (70) adapted to provide a range of voltage between the top electrode layer (12) and the TFT readout matrix (18). Varying the voltage between the top electrode layer (12) and the TFT readout matrix (18) and the TFT readout matrix (18) provides an acceptable sign-to-nose ratio over a greater range of exposures than provided at a single voltage. The method is useful for non- destructive testing applications.

La présente invention concerne un procédé et un appareil d'imagerie à rayons X numérique faisant appel à un dispositif d'imagerie (10) comprenant une couche d'électrode supérieure (12), une couche diélectrique (14), un capteur (16) comprenant une couche photoconductrice et une pluralité de pixels comprenant une électrode collectrice de charge (24), une matrice d'affichage (18) de transistor à couche mince (TFT) (18) connectée aux électrodes collectrices de charge (24), et une alimentation en courant variable (70) conçue pour fournir une plage de tension entre la couche d'électrode supérieure (12) et la matrice d'affichage TFT (18). Le fait de faire varier la tension entre la couche d'électrode supérieure (12) et la matrice d'affichage TFT (18) permet d'obtenir un rapport signal-bruit acceptable sur une plage plus importante d'expositions que celui obtenu sur une tension unique. Ledit procédé est utile pour des applications de test non destructives.

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