Image reconstruction apparatus and method for helical scanning
US5491735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention, in one form, utilizes a region of reconstruction ROR in reconstructing an image from projection data. Particularly, once the region of reconstruction is established, a weighting function which is either a linear interpolation or a non-interpolation can be used. If 3.pi. of projection data is used, the weighting function can be divided into three parts. Each part corresponds to .pi. projection views. For a 50% overlapped reconstruction, the entire weighting functions advance .pi. degrees at a time, which synchronizes very well with the boundaries of the weighting functions. Section 1(S.sub.1) will contain projection views from 0 to .pi., section 2 (S.sub.2) contains views from .pi. to 2.pi., and section 3 (S.sub.3) contains views from 2.pi. to 3.pi.. In section S.sub.1, the weighting function is a ramp-up function, in section S.sub.2 the weighting function is a constant, and in section S.sub.3 the weighting function is ramped down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.