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Radiation imaging apparatus having detection elements of varying sizes

  • US 5,151,588 A
  • Filed: 12/13/1991
  • Issued: 09/29/1992
  • Est. Priority Date: 11/24/1989
  • Status: Expired due to Fees
First Claim
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1. A radiation imaging apparatus comprising:

  • means for exposing an object to be examined to electromagnetic radiation;

    a detector array comprising a plurality of radiation detector units each of which corresponds to one of the pixels of a display and comprises a plurality of radiation detecting elements for detecting the radiation from said object under examination, each of said detecting elements having a photosensitive surface of a different area from those of the other detecting elements;

    a signal processing circuit of a photon counting type for processing the output signals of said detecting elements to produce an output corresponding to the number of the photons detected by each of said detecting elements; and

    a data processor for selecting one or more of said detecting elements of each of said detector units in accordance with the radiation dose received by said detecting elements so that the output of said selected one or more detecting elements is used as pixel information to form a radiation image of said object on said display.

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