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Method and apparatus for projecting diagnostic images from non-isotropic volumed diagnostic data

  • US 5,331,552 A
  • Filed: 12/04/1992
  • Issued: 07/19/1994
  • Est. Priority Date: 07/14/1992
  • Status: Expired due to Fees
First Claim
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1. A method of generating a diagnostic image of a body comprising the steps of:

  • directing a radiated energy through a region of interest of the body;

    detecting an interaction of the energy with the body to acquire data at a plurality of voxels, the voxels having actual spatial coordinates in dimensions of a coordinate system and being located within the region of interest of the body wherein a value of the datum of each voxel corresponds to a physical property of the body at the spatial coordinates, wherein the spatial coordinates of the voxels are not equally spaced along each of the dimensions;

    storing the data of the voxels in addresses in an electronic memory wherein the addresses are related to scaled spatial coordinates of the voxels, the scaled spatial coordinates being the actual spatial coordinates of the voxels transformed by multiplying at least one coordinate by a scaling factor;

    determining a desired view axis with respect to the actual spatial coordinates of the voxels along which to view the voxels, the desired view axis defined by three rotative coordinates;

    calculating an effective view axis from the desired view axis and the scaling factor, so that a ray directed along the effective view axis intersects the same voxels at the scaled spatial coordinates as the desired view axis would intersect the voxels at the actual spatial coordinates;

    transforming the scaled spatial coordinates of each voxel by at least one rotation to produce rotated spatial coordinates so that the effective view axis is normal to an imaging plane;

    projecting the voxels along the view axis to pixels in the image plane having image coordinates corresponding to the rotates spatial coordinates; and

    displaying pixel data at the image coordinates in an image.

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