Method and apparatus for compensating CT images for truncated projections
US4550371A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1982 |
| Grant date | Oct 29, 1985 |
| Priority date | — |
| Expiry date | Sep 27, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/432
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for compensating CT images for truncated projections created when an object extends beyond the field of view during the course of collecting a set of projections. Projections which have reference channel information influenced by the object are identified, and the reference channel information thereof replaced by more accurate information derived from unaffected projections. The zero and first order moments of the projection set are analyzed to better estimate the expected moments had the truncated projections not been truncated, and to use that information in completing the truncated projections. A closed form solution is used for convolution of the extensions of the truncated projections to avoid substantial delays in processing the final CT image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.