Automatic brightness control for direct view fluoroscopic imaging systems
US4171484A · kind A · utility
4Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1978 |
| Grant date | Oct 16, 1979 |
| Priority date | — |
| Expiry date | Jul 17, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/36
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus and method for controlling an X-ray generator in order to obtain a relatively constant output window brightness from a directly viewed X-ray image intensifier tube by introducing a small sinusoidal variation to the bias supply of the image intensifier tube and detecting only the resultantly modulated light component output from the phosphor display screen, the error signal thus derived being independent of dark current and power frequency components common to X-ray generated light output of the image intensifier tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.