Metal artifact reduction for 3D-digtial subtraction angiography
US10013779B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2015 |
| Grant date | Jul 3, 2018 |
| Priority date | — |
| Expiry date | Oct 16, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/404
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computed tomography (CT) imaging apparatus that reduces metal artifacts for digital subtraction angiography by, in circuitry, obtaining mask frames and contrast frames generated during scans of an object; performing a first reconstruction of the mask frames to generate metal volume data; identifying metal voxels in the metal volume data; re-projecting the metal voxels into the mask frames to generate metal-mask frames; defining a region of interest in each of the mask frames, each region of interest including metal regions; re-projecting the contrast frames; blending the mask frames with the re-projected contrast frames; registering the contrast frames with respect to the blended mask frames performing a cross-correlation analysis of the mask frames and the contrast frames, frame-pair-by-frame-pair; subtracting the registered contrast image from the corresponding mask image, frame-pair-by-frame-pair, to generate subtracted frames; and performing a second reconstruction on the subtracted frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.