Apparatus and method for noise reduction of spectral computed tomography images and sinograms using a whitening transform
US9875527B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2016 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Mar 17, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V2201/031
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus is provided to denoise material-decomposition data generated using projection data from a spectral computed tomography scanner. A whitening transform is used to transform the material-decomposition data into uncorrelated components and perform denoising on the uncorrelated components. Using different denoising parameters for the various uncorrelated components, a flattening can be achieved for the standard deviation of the noise as a function of X-ray energy, which can be determined using mono-energetic images derived from the material-decomposition data. The whitening transformation and the denoising can be applied the material-decomposition sinograms and/or to material-decomposition images reconstructed from the material-decomposition sinograms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.