Characteristic X-ray escape correction in photon-counting detectors
US9256938B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 26, 2014 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Apr 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10116
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and an apparatus for determining primary and secondary escape probabilities for a large photon-counting detector without pile-up. A model for the detector with no pile-up is formulated and used for spectrum correction in a computed tomography scanner. The method includes computing primary K-escape and secondary K-escape probabilities occurring at a certain depth within the photon-counting detector. Further, a no pile-up model for the photon-counting detector is formulated by determining a response function, based on the computed primary and secondary K-escape probabilities and geometry of the photon-counting detector. The method includes obtaining a measured CT scan of an object and further performs spectrum correction by determining the incident input spectrum based on the response function and the measured spectrum of the large photon-counting detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.