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Method for determining density distributions and atomic number distributions during radiographic examination methods

  • US 7,158,611 B2
  • Filed: 08/21/2002
  • Issued: 01/02/2007
  • Est. Priority Date: 09/03/2001
  • Status: Expired due to Fees
First Claim
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1. A method for determining distributions of density and atomic number in an object to be examined, comprising:

  • recording a first distribution of X-ray absorption values of the object to be examined using a first X-ray spectrum;

    recording at least a further distribution of X-ray absorption values of the object to be examined using a further X-ray spectrum;

    selecting, from the recorded first distribution of X-ray absorption values, a first X-ray absorption value;

    selecting from the recorded further distribution of X-ray absorption values, a further X-ray absorption value assigned to said first X-ray absorption value or selecting, from each of said recorded further distribution of X-ray absorption values, a further X-ray absorption value assigned to said first X-ray absorption value;

    specifying a first function representing paired values of density and atomic number that correspond to said first X-ray absorption value selected from said recorded first distribution of X-ray absorption values;

    specifying a further function representing paired values of density and atomic number that correspond to said further X-ray absorption value selected from said recorded further distribution of X-ray absorption values of specifying a further function representing paired values of density and atomic number for each X-ray absorption value assigned to said first X-ray absorption value in the recorded further distributions of X-ray absorption values; and

    determining a value for the density and determining a value for the atomic number from a comparison of said first function representing paired values of density and atomic number that correspond to said first X-ray absorption value with one or more of said further functions representing paired values of density and atomic number that correspond to said respective further X-ray absorption values, and which are assigned to said first X-ray absorption value.

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