Apparatus for C-arm calibration for 3D reconstruction in an imaging system utilizing planar transformation
First Claim
1. Apparatus for C-arm calibration for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, and utilizing a planar transformation for relating voxels in a voxel space and pixels in said imaging plane, said apparatus comprising:
- data storage means for storing a definition of a source coordinate system in reference to said imaging source;
data storage means for storing a definition of a normal plane in said voxel space, not including the origin of said source coordinate system and being substantially normal to an optical axis from said source to said imaging plane;
data storage means for storing a definition of a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters;
apparatus for identifying pixel location coordinates for a respective pixel corresponding to each voxel in said normal plane by utilizing planar to planar or 2D to 2D transformation parameters;
data storage means for storing a value of a filtered image at said respective pixel location; and
a data processor for accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct said each voxel.
3 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for C-arm calibration for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, and utilizing a planar transformation for relating voxels in a voxel space and pixels in the imaging plane, comprises data storage apparatus for storing a definition of a source coordinate system in reference to the imaging source; data storage apparatus for storing a definition of a normal plane in the voxel space, not including the origin of the source coordinate system and being substantially normal to an optical axis from the source to the imaging plane; data storage apparatus for storing a definition of a relationship between the source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters; apparatus for identifying pixel location coordinates for a respective pixel corresponding to each voxel in the normal plane by utilizing planar to planar transformation parameters; data storage apparatus for storing a value of a filtered image at the respective pixel location; and a data processor for accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct the each voxel.
142 Citations
27 Claims
-
1. Apparatus for C-arm calibration for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, and utilizing a planar transformation for relating voxels in a voxel space and pixels in said imaging plane, said apparatus comprising:
-
data storage means for storing a definition of a source coordinate system in reference to said imaging source; data storage means for storing a definition of a normal plane in said voxel space, not including the origin of said source coordinate system and being substantially normal to an optical axis from said source to said imaging plane; data storage means for storing a definition of a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters; apparatus for identifying pixel location coordinates for a respective pixel corresponding to each voxel in said normal plane by utilizing planar to planar or 2D to 2D transformation parameters; data storage means for storing a value of a filtered image at said respective pixel location; and a data processor for accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct said each voxel. - View Dependent Claims (2, 3, 4, 5)
-
-
6. 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:
-
storage means for storing a definition of a source coordinate system in reference to said imaging source; storage means for storing a definition of a normal plane in said voxel space, not including the origin of said source coordinate system and being substantially normal to an optical axis from said source to said imaging plane; storage means for storing a definition of a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters; data processing means for identifying pixel location coordinates for a respective pixel corresponding to each voxel by utilizing planar to planar transformation parameters; storage means for storing a value of a filtered image at said respective pixel location; data processing and storage means for accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct said each voxel; data processing means for dividing said voxel space into a plurality of planes parallel to said normal plane; 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 (7, 8, 9, 10, 11, 21, 22, 23, 27)
-
-
12. 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 the steps of:
-
storage means for storing the definition of a source coordinate system in reference to said imaging source; storage means for storing the definition a normal plane in said voxel space, not including the origin of said source coordinate system and being substantially normal to an optical axis from said source to said imaging plane; storage means for storing the definition of a relationship between said source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters; data processing means for identifying pixel location coordinates for a respective pixel corresponding to each voxel by utilizing planar to planar transformation parameters; storage means for storing a value of a filtered image at said respective pixel location; and data processing and storage means for accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct said each voxel; data processing means for dividing said voxel space into a plurality of planes parallel to said normal plane; 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; 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 planes and pixels on said image plane. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 24, 25, 26)
-
Specification