X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1997-12-31
1999-10-05
Bruce, David Vernon
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 17, 378901, A61B 603
Patent
active
059636122
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.
REFERENCES:
patent: 5038371 (1991-08-01), Janssen et al.
Ahmed Adel A.
Bruce David Vernon
Siemens Corporation Research, Inc.
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