ROWLANDS, JOHN,DECRESCENZO, GIOVANNI,POKHREL, CHANDRA,REZNIK, ALLA
申请号：
CA2809521
公开号：
CA2809521C
申请日:
2011.09.13
申请国别(地区):
CA
年份:
2017
代理人:
摘要：
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.
