High speed computed tomography device and method
US5889833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Jun 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An x-ray computed tomography device and method where backprojection is performed with pixels each having their own back projection range. The range is determined using a two-dimensional completeness condition such that every line through a reconstructed slice must intercept the projection of the source orbit onto the plane of the slice. The completeness condition provides an adequate amount of data for the back projection to maintain quality of the reconstructed image while allowing a higher helical pitch ratio. This is advantageous in situations where fast scanning is desired, such as patient screening and CT-angiography. The method and device are preferably applied to a helical cone beam system. The backprojection can be performed using cone-beam projection data obtained with a helical scan or after sorting the projection data into parallel-beam ray-sums in the transverse plane while maintaining the cone angle. The sorting advantageously further increases the helical pitch ratio and thus increases scanning speed and reduces scanning time. The two types of backprojection may each use either the full projection data set or a minimal data set determined based upon the completeness c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.