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CMOS readout architecture and method for photon-counting arrays

  • US 8,426,797 B2
  • Filed: 03/23/2010
  • Issued: 04/23/2013
  • Est. Priority Date: 03/23/2010
  • Status: Active Grant
First Claim
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1. An apparatus for detecting and counting photons, comprising:

  • sensing elements, each sensing element including;

    a photon-counting detector to provide signals representative of detected photons;

    a digital counter operably coupled to the photon-counting detector and configured to change a count responsive to the signals from the photon-counting detector and to continue changing the count after the number of detected photons has exceeded a certain number;

    an overflow bit operably coupled to the digital counter and responsive to an indication that the count in the digital counter has reached the certain number; and

    a rolling readout system operably coupled to each sensing element and configured to poll the overflow bit.

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