Metal artifacts reduction in cone beam reconstruction
US9934597B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 11, 2014 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Nov 15, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T11/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for reducing metal artifacts in a volume radiographic image reconstructs a first 3-D-image using measured projection images and forms a 3-D image metal mask that contains metal voxels. For each measured projection image, a projection metal mask is a projection of the 3-D image metal mask. A 3-D prior image contains voxels within the 3-D image metal mask. Voxel values of the first 3-D image outside the 3-D image metal mask are replaced with a value representative of air or soft tissue. Non-metal voxels of the 3-D prior image are modified according to a difference between a pixel value related to the nonmetal voxel and the corresponding pixel value in a calculated projection image. Composite projection images are formed by replacing measured projection image data for pixels within the projection metal mask with calculated projection image data. A metal artifact reduced 3-D image is reconstructed from composite projections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.