Filter for data processing
US4674045A · kind A · utility
11Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1984 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Dec 31, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/421
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An imaging method and apparatus having a new and improved data filter. In one application of the invention computed tomography number inaccuracies are avoided by use of a new filter function derived from discrete points of a truncated spatial domain convolution filter. The points from the truncated convolution filter are fourier transformed to yield a ramp filter with ripple in the spatial frequency domain. Data from a CT scan is filtered with this new filter function and back projected to produce images that do not exhibit CT number inaccuracies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.