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Pre-calculated hitlist for reducing run-time processing of an exact cone beam reconstruction algorithm

  • US 5,862,198 A
  • Filed: 09/30/1997
  • Issued: 01/19/1999
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Term
First Claim
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1. A method of operating a 3D CT imaging apparatus having a cone beam radiation source and detector arrangement, for reconstructing an image of an object that is scanned by said source and detector arrangement, comprising the following steps:

  • before the acquisition of measurement data during an imaging operation of the apparatus,pre-calculating and storing image reconstruction processing information required for processing of the acquired measurement data to develop contributions to the final reconstruction of the image, which information is dependant on the geometric parameters of the imager and independent of the measurement data; and

    during the imaging operation of the apparatus,operating said source and detector arrangement at a plurality of source positions along a scan path so as to acquire a corresponding plurality of sets of said measurement data, andprocessing the acquired measurement data using said pre-calculated image reconstruction processing information for developing said contributions and reconstructing the image.

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