Radial adaptive filter for metal artifact correction
US7991243B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2006 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Nov 17, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T11/008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A diagnostic imaging system (10) corrects metal artifact streaks (38) emanating from a metal object (36) in a tomographic image (T). A first processor (40) reduces streaks (38) caused by mild artifacts by applying an adaptive filter (82). The filter (82) is perpendicularly oriented toward the center of the metal object (36). The weight of the filter (82) is a function of the local structure tensor and the vector pointing to the metal object (36). If it is determined that the strong artifacts are present in the image, a second processor (48) applies a sinogram completed image algorithm to correct for severe artifacts in the image. The sinogram completed image and adaptively filtered image are fused to a final corrected image. In the fusion process, highly corrupted tomographic regions are replaced by the result of the sinogram completed image and the remainder is replaced by the adaptively filtered image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.