Thunder Bay Regional Institute

Chandra Pokhrel

John A Rowlands

Alla Reznik

Giovanni Decrescenzo

Systems and methods of resetting a blocking-type photoconductive imaging detector are provided. In one embodiment, after having obtained an image, the imaging detector may be reset by applying a reversed bias potential difference and illuminating the imaging radiation detector with photoexcitation radiation. The photoexcitation radiation has a wavelength selected to excite mobile charges within the photoconductive layer and a spatial intensity profile related to the measured image for neutralizing the trapped charges in a spatially compensated manner. In another embodiment, a photoionizing beam is directed onto an x-ray light valve having a liquid crystal layer in contact with a photoconductive layer. The beam passes through an optically transmissive surface of the x-ray light valve and photoionizes a species within the liquid crystal layer, generating mobile charged entities that at least partially neutralize charges trapped at the interface, improving the performance of the x-ray light valve when performing subsequent x-ray imaging.

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Thunder Bay, Canada

Chandra Pokhrel