Methods and systems for determining x-ray beam position in multi-slice computed tomography scanners
US6370218B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Oct 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/419
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Focal spot position determination systems having a high sensitivity to focal spot movement for use in connection with multi-slice computed tomography imaging systems are described. In one embodiment, the determination system is configured for application in a two slice system. Signals from adjacent detector cells in separate rows are compared to determine focal spot position. More particularly, the signal intensity A of the signal output by a first detector cell and the signal intensity B of the signal output by the second detector cell are related to the position of the focal spot. That is, the z position of the centerline of the fan beam can be determined by relating the signal intensities A and B according to the ratio [(A−B)/(A+B)]. Such ratio is representative of the beam location and can be used to control adjustment of the imaging system pre-patient collimator to maintain the beam in the desired position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.