Large format CID x-ray image sensor

A large format (31 x 23 mm(2) display) CID imager module capitalizes on CID large well capacity and radiation resistance to image dental x-rays. The module, which consists of the imager, conversion phosphor and ancillary electronics, is encapsulated in a 40 x 28 x 5 mm(3) robust package that is lightproof, moisture-proof and meets FDA and RFL/EMI standards. Data exposure and readout is simple. The imager normally exists in an active reset mode until X-ray application automatically places the imager into a charge integration mode. Readout begins immediately upon completion of the x-ray exposure or manual application of an external trigger source. The imager returns to the reset mode once the data read out is complete. Pixels are arranged in an SVGA compatible 800(H) x 600(V) format. Each pixel is square and 38.5 microns/side. The imager is coated using a proprietary phosphor deposition process that results in a limiting resolution of 9 LP/mm from an X-ray illumination source. Better than 2,000:1 dynamic range and shot-noise limited operation is achieved. Direct X-ray detection and attendant noise is minimized via the phosphor and epitaxial layer that lies beneath the pixel array. The imager/module architecture and electro-optical performance are described in detail here in.