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Apparatus and method for classifying objects in computed tomography data using density dependent mass thresholds

  • US 6,076,400 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 classifying an object represented in computed tomography (CT) data for a region comprising:

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

    for each of a plurality of volume elements, comparing the density value of the volume element to a volume element density range;

    if the density value of the volume element is within said volume element density range, identifying the volume element as an object volume element;

    combining a plurality of identified object volume elements into an object;

    using the density values associated with the combined object volume elements, calculating a density of the object;

    identifying an object density range which contains the calculated density of the object;

    selecting an object mass range based on the calculated density of the object wherein the selected object mass range is associated with the object density range;

    calculating a mass of the object;

    comparing the mass of the object with the selected object mass range;

    if the mass of the object is within the selected object mass range, classifying the object as belonging to a predetermined class of objects.

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