Radiation imaging automatic gain control
US4910592A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jan 13, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An x-ray imaging system incorporating a television imaging chain is disclosed. The system includes automatic gain control circuitry, operable upon the video signal produced by the camera of the television imaging chain. The gain control circuitry affords automatic gain control capability for increasing the video gain in response to an undesired decrease in video output signal level. The gain control circuitry, however, is constrained in that it includes circuitry for establishing a minimum video gain which is always maintained during a study, irrespective of increases in brightness of an overall sample window area of the image, which could otherwise cause undesirable darkening of areas of interest in the image when the sample window also includes uninteresting structure which happens to exhibit a bright field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.