C-arm calibration method utilizing aplanar transformation for 3D reconstruction in an imaging system
US6731283B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 1997 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A C-arm calibration method for 3D reconstruction in an imaging system comprising an imaging source and an imaging plane, the method utilizing 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 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; defining a relationship between the source coordinate system and another coordinate system, herein referred to as a world coordinate system, by transformation parameters; identifying pixel location coordinates for a respective pixel corresponding to each voxel by utilizing planar to planar transformation parameters; storing a value of a filtered image at the respective pixel location; accumulating contributions corresponding to a plurality of image projections so as to thereby reconstruct each voxel; dividing the voxel space into a plurality of planes parallel to the normal plane; back projecting an image of a plurality of pixels on the image plane onto a set of copl…
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