C-arm calibration method for 3D reconstruction in an imaging system
First Claim
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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Abstract
A C-arm calibration method for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, utilizes a planar transformation for relating voxels in a voxel space and pixels in the imaging plane, and comprises the steps of defining a source coordinate system in reference to the imaging source; defining first and second normal planes in the voxel space, the planes being parallel to one another, neither including the origin of the source coordinate system and being substantially normal to an optical axis from the source to the imaging plane; defining a relationship between the 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 the first and second normal planes by utilizing the rotation parameter, storing a value of a filtered image at the respective pixel location; and accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct the each voxel on each of the first and second normal planes.
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Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3)
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4. 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:
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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. dividing said voxel space into a plurality of planes parallel to said normal planes; back projecting an image of a plurality of pixels on said image plane onto a set of coplanar voxels defining one of said plurality of parallel planes; and defining a relationship in said source coordinate system between each of said plurality of pixels and corresponding ones of said coplanar voxels so as to obtain a 2-dimensional mapping between points on said one of said plurality of parallel planes and pixels on said image plane. - View Dependent Claims (5, 6, 7, 8, 9)
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10. Apparatus for C-arm calibration for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, said apparatus utilizing a planar transformation for relating voxels in a voxel space and pixels in said imaging plane, and comprising.
means for storing a defined a source coordinate system in reference to said imaging source; -
means for storing 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; means for storing a defined relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by a rotation parameter; data processing means for identifying and storing 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, means for storing a value of a filtered image at said respective pixel location; and data processing means for 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. - View Dependent Claims (11, 12)
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13. Apparatus for C-arm calibration for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, said apparatus utilizing a planar transformation for relating voxels in a voxel space and pixels in said imaging plane, and comprising:
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means for storing a defined source coordinate system in reference to said imaging source; means for storing defined 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; means for storing a defined a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by a rotation parameter; data processing means for identifying and storing 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; means for storing a value of a filtered image at said respective pixel location; and data processing means for accumulating and storing 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. data processing means for dividing said voxel space into a plurality of planes parallel to said normal planes; data processing means for back projecting an image of a plurality of pixels on said image plane onto a set of coplanar voxels defining one of said plurality of parallel planes; and data processing means for defining a relationship in said source coordinate system between each of said plurality of pixels and corresponding ones of said coplanar voxels so as to obtain a 2-dimensional mapping between points on said one of said plurality of parallel planes and pixels on said image plane. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification