Method and apparatus for z-axis tracking and collimation
US6980623B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2003 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Dec 30, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for adjusting a focal spot position during a scan of a computed tomography (CT) imaging system having a z-axis. The CT imaging system includes a detector array having a plurality of detector elements and an x-ray tube configured to direct an x-ray beam towards the detector through an object to be imaged. The method includes turning on the x-ray tube and reading a z-ratio from the detector. A shift in a position of a focal spot of the x-ray tube is then determined utilizing the read z-ratio. The method further includes using a transfer function to determine a compensating electronic deflection value; and applying the electronic deflection value to the x-ray tube as at least one of a deflection voltage or a deflection current to track the focal spot in the z-axis direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.