Apparatus and method for hybrid pre-log and post-log iterative image reconstruction for computed tomography
US10213176B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 27, 2016 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Apr 27, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/424
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus is provided to iteratively reconstruct a computed tomography (CT) image using a hybrid pre-log and post-log iterative reconstruction method. A pre-log formulation is applied to values of the projection data that are less than a threshold (e.g., X-ray intensities corresponding to high absorption trajectories). The pre-log formulation has better noise modeling and better image quality for reconstructed images, but is slow to converge. Projection data values above the threshold are processed using a post-log formulation, which has fast convergence but poorer noise handling. However, the poorer noise handling has little effect on high value projection data. Thus, the hybrid pre-log and post-log method provides improved image quality by more accurately modeling the noise of low count projection data, without sacrificing the fast convergence of the post-log method, which is applied to high-count projection data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.