Reprojection and backprojection methods and algorithms for implementation thereof
US6724856B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2002 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Apr 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/424
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods for projecting and backprojecting rays with respect to pixels/detector bins to attenuate/eliminate high-frequency artifacts, are disclosed. The first two methods are adaptations of pixel-driven and ray-driven linear interpolation techniques respectively. In these techniques, the window or shadow of each pixel/bin is dynamically adjusted and projected onto the detector bin/pixel to eliminate gaps between the shadows. This allows the effect of each pixel on a given detector bin (or vice versa) to be appropriately weighted. A third is a distance-driven technique wherein the transitions of the pixels and the detector bins are respectively projected onto a common axis. This allows a determination of the contribution of each of the pixels/bins for each of the bins/pixels with lower computation time and improved artifact free images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.