Computer tomographic method and a computer tomograph
US6151377A · kind A · utility
9Cited by
3References
7Claims
0Family size
Inventor
Key dates
| Filing date | Jan 25, 1999 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Jan 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In conventional backprojection, each pixel value is calculated separately. With N pixels N.sup.3 additions are necessary. According to the invention, the summation is instead divided into partial sums which are then used to form new partial sums in a hierarchial way. A substantial computational reduction is obtained because a partial sum has approximately the same value for many neighboring points, and that interpolations are feasible. Instead of N.sup.3 additions, the number of additions can be reduced to the order of magnitude of N.sup.2 log N.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.