Automatic exposure control device for an X-ray generator
US4313055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Jun 8, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/44
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The automatic exposure control devices of contemporary X-ray generators have a constant lead time which accurately takes into account the actual ratios or delays only for a given setting of current and voltage. Particularly in the case of high voltages and small currents, the lead times are too short, thus giving rise to overexposures. The invention provides an automatic exposure control device in which the lead time is calculated from the exposure data by an arithmetic unit. The lead time is adjusted on a correspondingly constructed adjustable lead time network. An arithmetic unit of this kind is not required for the programmed exposure technique. The correct lead times can then be programmed and stored together with the other exposure parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.