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Projection methods for producing two-dimensional images from three-dimensional data

  • US 5,233,299 A
  • Filed: 03/25/1991
  • Issued: 08/03/1993
  • Est. Priority Date: 03/25/1991
  • Status: Expired due to Fees
First Claim
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1. A method of displaying a two-dimensional (2D) projection image of desired structures of a subject from collected three-dimensional (3D) image data of a volume of a subject comprising the steps of:

  • a) acquiring a 3D data set having a plurality of entries, each entry being a value corresponding to at least one physical parameter representative of a voxel within said volume;

    b) selecting a statistical order k;

    c) choosing a viewing angle from which to view said volume;

    d) determining a set of intersected voxels which are intersected by a selected imaginary projection ray passing through said volume at the viewing angle and determining N intersected data set entries Vi corresponding to the intersected voxels;

    e) calculating an average V and a standard deviation σ

    from the N intersected data set entries Vi ;

    f) calculating a projection value Pk from the N intersected data set entries Vi according to the equation;

    ##EQU2## g) repeating steps "d"-"f" for a plurality of parallel imaginary projection rays at the viewing angle covering said volume;

    h) transferring the projection values Pk to a two-dimensional display device;

    i) displaying a two-dimensional image created from the projection values Pk on the two dimensional display device for analysis and interpretation;

    j) increase the value of the statistical order k and repeat steps "d"-"i" if a greater contrast of said structures in the projection image is desired; and

    k) decrease the value of the statistical order k and repeat steps "d"-"i" if a greater signal-to-noise ratio of said structures in the projection image is desired.

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