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Method of and system for computing effective atomic number images in multi-energy computed tomography

  • US 7,190,757 B2
  • Filed: 05/21/2004
  • Issued: 03/13/2007
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
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1. A method of computing Z images from the CT projection data acquired by scanning a set of objects using at least two x-ray spectra, wherein said projection data includes a set of low energy projections and a set of high energy projections, comprising:

  • a. reconstructing a CT image from one of the two sets of projections, which are not processed by any decomposition methods;

    b. obtaining the photoelectric projections from the high energy projections and low energy projections without decomposition to Compton projections;

    c. reconstructing a photoelectric image from the photoelectric projections; and

    d. computing the Z image from the photoelectric image and the CT image, without using any Compton images.

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