Method and apparatus for computed tomography (CT) and material decomposition with pile-up correction calibrated using real pulse pileup effect and detector response
US10869646B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2018 |
| Grant date | Dec 22, 2020 |
| Priority date | — |
| Expiry date | Apr 29, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/582
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus and method are described using a forward model to correct pulse pileup in spectrally resolved X-ray projection data from photon-counting detectors (PCDs). To calibrate the forward model, which represents each order of pileup using a respective pileup response matrix (PRM), an optimization search determines the elements of the PRMs that optimize an objective function measuring agreement between the spectra of recorded counts affected by pulse pileup and the estimated counts generated using forward model of pulse pileup. The spectrum of the recorded counts in the projection data is corrected using the calibrated forward model, by determining an argument value that optimizes the objective function, the argument being either a corrected X-ray spectrum or the projection lengths of a material decomposition. Images for material components of the material decomposition are then reconstructed using the corrected projection data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.