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C-arm calibration method for 3D reconstruction in an imaging system

  • US 5,963,613 A
  • Filed: 12/31/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 12/31/1997
  • Status: Expired due to Term
First Claim
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1. A C-arm calibration method for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, said method utilizing a planar transformation for relating voxels in a voxel space and pixels in said imaging plane, and comprising the steps of:

  • defining a source coordinate system in reference to said imaging source;

    defining first and second normal planes in said voxel space, said planes being parallel to one another, neither including the origin of said source coordinate system and being substantially normal to an optical axis from said source to said imaging plane;

    defining a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by a rotation parameter;

    identifying pixel location coordinates for a respective pixel corresponding to each voxel in each of said first and second normal planes by utilizing said rotation parameter;

    storing a value of a filtered image at said respective pixel location; and

    accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct said each voxel on each of said first and second normal planes.

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