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Apparatus and method for density discrimination of objects in computed tomography data using multiple density ranges

  • US 6,078,642 A
  • Filed: 02/11/1998
  • Issued: 06/20/2000
  • Est. Priority Date: 02/11/1998
  • Status: Expired due to Term
First Claim
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1. A method of identifying an object represented computed tomography (CT) data for a region comprising:

  • identifying a plurality of volume elements for the region in the CT data, each volume element being associated with a density value;

    identifying a first density range and a second density range;

    for each of the plurality of volume elements, comparing the density value of the volume element with at least one of the density ranges;

    if the density value of the volume element is within one of the density ranges, labeling the volume element as being associated with an object of interest; and

    for each volume element labeled as being associated with an object of interest, (i) computing a difference between the density value of the volume element and the density value of a neighboring volume element, and (ii) if the difference between the density value of the volume element and the density value of the neighboring volume element is below a predetermined difference threshold, combining the volume element and the neighboring volume element into a single object.

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