Method and apparatus for reducing spectrally-sensitive artifacts
US6879660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Mar 28, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10116
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A technique is provided in which a gain correction map derived for a detector at one X-ray spectrum may be adapted to accommodate images acquired by the detector at a different X-ray spectrum. The technique accounts for the physical variations in the detector which may produce spectrally-sensitive artifacts as well as for the particular image acquisition conditions. A technique is also provided for correcting edge artifacts in an acquired image by measuring median signal intensity within columns or rows of the image and deriving correction factors for the respective edge columns or rows based upon the trends of the median signal intensities. A technique is also provided for storing detector attributes during a manufacturing calibration process and accessing them during system operation such that a suitable gain correction factor is employed based upon the spectrum and operating conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.