Patient movement correction method for cone-beam computed tomography
US10636179B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Jul 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/424
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A patient movement correction method for cone-beam computed tomography wherein a set of X-ray projection images of the patient is acquired using the X-ray imaging means. An initial projection geometry estimate describing the spatial positions and orientation of the X-ray source and the X-ray detector during the acquisition of an X-ray projection images is defined. An intermediate CBCT reconstruction using the X-ray projection images and the initial projection geometry estimate is computed. Projection-image-specific corrective geometric transformations are determined for the initial projection geometry estimate and the intermediate CBCT reconstruction. A final CBCT reconstruction is computed using the X-ray projection images and a corrected estimate of the projection geometry corresponding to the determined corrective geometric transformations wherein the corrective geometric transformations for the initial projection geometry estimate are determined in a projection-image-specific rotating coordinate system corresponding to the spatial positions and orientations of the X-ray source and X-ray detector during the acquisition of the X-ray projection images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.