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Autosegmentation/autocontouring system and method for use with three-dimensional radiation therapy treatment planning

  • US 5,859,891 A
  • Filed: 03/07/1997
  • Issued: 01/12/1999
  • Est. Priority Date: 03/07/1997
  • Status: Expired due to Term
First Claim
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1. An autocontouring method, comprising the steps of:

  • (a) producing a two-dimensional image of a structure with the structure having at least one object disposed therein and the object is substantially defined by boundary, with an area within the boundary being of a first class of material and an area outside of the boundary being of a second class of material;

    (b) forming a polygon in the object such that the polygon is fully within the boundary of the object and the polygon subtends only a first class of material;

    (c) testing a discrete portion of an area outside of, but adjacent to, the polygon according to a maximum a posteriori decision rule according to an Expression
    
    
    space="preserve" listing-type="equation">if g.sub.i (X)>

    g.sub.j (X), decide the first class of material, else decide the second class of material, where,gi (X)=discriminant function for a class of material, denoted i;

    gj (X)=discriminant function for a class of material, denoted j;

    (d) expanding the polygon to include the discrete portion tested at step (c) if it is determined that the discrete portion is of a first class of material;

    (e) repeating steps (c) and (d) until the testing at step (c) determines that at each location outside of, and adjacent to, a polygon expanded according to steps (c) and (d), a discrete portion tested at step (c) is of second material; and

    (f) computing a boundary of the object based on a shape of the expanded polygon when it is determined that at each location outside of, and adjacent to, the polygon expanded according to steps (c) and (d), the discrete portion tested at step (c) is of second material.

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