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Image reconstruction using multiple X-ray projections

  • US 20020106051A1
  • Filed: 12/20/2000
  • Published: 08/08/2002
  • Est. Priority Date: 12/20/2000
  • Status: Active Grant
First Claim
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1. A method for reconstructing the image of an object using at least 2 single plane X-ray projections, the method comprising the steps of;

  • a) substantially uniformly filling the object with an X-ray contrast agent;

    b) irradiating said contrast agent-filled object with X-rays from at least two directions;

    c) detecting said X-rays transmitted through said contrast agent-filled object to define at least two live X-ray projection absorbance profiles;

    d) providing a first image to be corrected;

    e) updating the image provided in step d) by setting the absorbance value to 0 for all picture elements having an absorbance below a preselected threshold value and by setting all other picture elements to the absorbance value corresponding to the concentration of the X-ray contrast agent within the object;

    f) forward projecting the image obtained in step e) into said at least 2 planes of projection along said at least two directions to obtain X-ray absorbance profiles of said image to be corrected;

    g) calculating the difference between the absorbance profiles of the object and of the image to be corrected;

    h) correcting the image obtained in step e) using iterative reconstruction techniques;

    i) repeating steps e) to h) until the difference between the current absorbance profiles and the object absorbance profiles is less than a selected value;

    j) displaying the image.

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