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Method and system for automatic detection of ribs and pneumothorax in digital chest radiographs

  • US 5,668,888 A
  • Filed: 12/29/1993
  • Issued: 09/16/1997
  • Est. Priority Date: 11/21/1990
  • Status: Expired due to Term
First Claim
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1. A method for the detection of a anatomic feature in a chest radiograph, comprising:

  • (a) defining plural regions of interest in said radiograph;

    (b) determining edge gradients in at least one of said plural regions of interest and corresponding orientations of said edge gradients for each of a plurality of pixels included in said at least one of said regions of interest;

    (c) determining a cumulative edge gradient of the edge gradients and corresponding orientations determined in said at least one of said plural regions of interest in step (b) by summing in said at least one of said plural regions of interest the edge gradients having the same orientation; and

    (d) detecting at least one edge of said anatomic feature based upon the cumulative edge gradient determined in said at least one of said plural regions of interest, comprising,(d1) determining which regions of interest in aid cumulative edge gradient have an orientation within a predetermined range of orientations; and

    (d2) determining a location of an edge of said anatomic feature based on locations of regions of interest which are determined in step (d1) to have said orientation within said predetermined range of orientations; and

    (e) producing a representation of said anatomic feature using said at least one detected edge.

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