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    X-RAY IMAGE DETECTOR
    2.
    发明公开
    X-RAY IMAGE DETECTOR 审中-公开
    X射线探测器

    公开(公告)号：EP1761954A1

    公开(公告)日：2007-03-14

    申请号：EP05745115.5

    申请日：2005-06-09

    申请人： Koninklijke Philips Electronics N.V.

    发明人： FRANKLIN, Anthony, R. ,  POWELL, Martin, J. ,  OVERDICK, Michael ,  NASCETTI, Augusto ,  RUETTEN, Walter ,  POORTER, Tiemen ,  ALVING, Lex

    IPC分类号： H01L27/146

    CPC分类号： H01L27/14658 ,  H01L27/14676

    摘要： An Y-ray detector apparatus comprises an array of detector pixels arranged into a plurality of sub-arrays. The pixels in each sub-array share a common dose sensing output provided to a dose sensing output conductor which extends to a periphery of the pixel array. The dose sensing output conductor for one sub-array of pixels passes through the area occupied by another sub-array of pixels, which can lead to unwanted cross talk. The invention provides a plurality of additional screening electrodes, with a screening electrode substantially adjacent the dose sensing output conductor for each sub-array of pixels. These screening electrodes reduce cross talk between the dose sensing output and other pixel electrodes. In another arrangement, each pixel further comprises a pixel electrode for each pixel formed at an upper region of the array, and the dose sensing output conductors are formed at a lower regon of the array. An intermediate conductor layer is then provided which overlaps the dose sensing output conductors for other sub-arrays of pixels and which pass through the area occupied by the sub-array of pixels.

    HIGH DYNAMIC RANGE X-RAY DETECTOR WITH IMPROVED SIGNAL TO NOISE RATIO
    3.
    发明公开
    HIGH DYNAMIC RANGE X-RAY DETECTOR WITH IMPROVED SIGNAL TO NOISE RATIO 有权
    具有高动态范围，并提升信号噪声比X射线探测器

    公开(公告)号：EP2294455A2

    公开(公告)日：2011-03-16

    申请号：EP09769736.1

    申请日：2009-06-19

    申请人： Philips Intellectual Property & Standards GmbH ,  Koninklijke Philips Electronics N.V.

    发明人： RUETTEN, Walter ,  ALVING, Lex ,  BUSS, Thomas, F. ,  POORTER, Tiemen ,  WOLFS, Peter, B. A.

    IPC分类号： G01T1/24

    CPC分类号： G01T1/24 ,  H04N5/32 ,  H04N5/3559

    摘要： An x-ray detector and its pixel circuit are described, that allow to cover a large dynamic range with automatic selection of the sensitivity setting in each pixel, thus providing improved signal to noise ratio with all exposure levels. X-ray detectors are required to cover a large dynamic range. The largest exposure determines the required pixel capacitance. However, a large pixel capacitance gives a bad signal to noise ratio with small exposures e.g. in the dark parts of the image. This invention disclosure describes several approaches to provide automatic sensitivity selection in the pixels. This ensures that low signals are stored in a small capacitor or read out with a high sensitivity with corresponding good signal to noise ratio, while larger signals are stored in larger capacitors or are read out with lower sensitivity so that no information is lost.