Abstract: A direct conversion digital x-ray detector is provided with inherent high voltage protection for static and dynamic imaging. The detector has an n-channel active matrix TFT array, a coplanar photoconductor structure and a high voltage biasing electrode. In order to achieve high voltage protection, the biasing electrode is set to a negative potential and the TFT “off” gate voltage is set to a predetermined negative value, such that the TFT is essentially non-conductive.

Abstract: A method for producing a multilayer plate for X-ray imaging is disclosed. As the first step in the method, there is provided a plate of a substrate. Then, there is deposited on this substrate a thin film of amorphous arsenic triselenide by thermal evaporation under reduced pressure, followed by condensation on the substrate. A thick photoconductive film of doped amorphous selenium is then deposited by evaporation and condensation on the thin layer of amorphous arsenic triselenide. This thick photoconductive film can also be deposited directly onto the substrate. Then, a thin film of alkali doped selenium is deposited onto the thick photoconductive layer by evaporation or co-evaporation and condensation, and a conducting biasing electrode is formed on top of this alkali doped film.

Abstract: Erasure of an x-ray imaging device is performed by applying high voltage and erasing light simultaneously. The polarity of the high voltage may be reversed during the erasure operation. This produces an erasure that eliminates non-uniformities or ghosts arising from a previous image.

Abstract: A multilayer plate for X-ray imaging is provided, which includes a substrate, a biasing electrode and a selenium-based membrane sandwiched between the substrate and the biasing electrode. The selenium-based membrane comprises a thick photoconductive layer of doped amorphous selenium and one or two thin buffer layers. One of the buffer layers is an amorphous arsenic triselenide layer positioned between the photoconductive layer and the substrate, and the other buffer layer is a unipolar conducting layer of alkali doped selenium positioned between the photoconductive layer and the biasing electrode. Preferably both layers are included. A method of producing such multilayer plates is also disclosed.