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    HIGH DYNAMIC RANGE X-RAY DETECTOR WITH IMPROVED SIGNAL TO NOISE RATIO
    1.
    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.