Computed tomography (CT) weighting for high quality image recontruction
US6463118B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Jan 23, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
One aspect of the present invention is a CT imaging method. An object is scanned at a selected helical pitch to acquire a set of attenuation measurement. For each angle of a fan beam of radiation, a direct and a conjugate set of attenuation measurements are identified that each include at least two measurements closest to a plane of reconstruction. Measurements are arranged in pairs, including a short pair and a long pair, using direct and conjugate measurements. Direct measurements are weighted in accordance with their distance from the plane of reconstruction. Direct measurements of the short and long pairs are blended according to a blending function that weights the short pair contribution to zero at a point at which the selected direct pair and the selected conjugate pair have a same z-axis location. The weighted and blended data is used to reconstruct an image of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.