X-ray diagnostics installation with spatial frequency high-pass filtering
US4722097A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Nov 25, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/3205
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An X-ray diagnostics installation with spatial frequency high-pass filtering has an X-ray tube, in image intensifier video chain, first and second image memories, and a difference stage for subtracting images in the memories and thereby forming a difference signal between first video signals and chronologically succeeding second video signals. The resulting image is displayed on a monitor. The installation further has a control unit for controlling the size of the tube focus. A video signal for an X-ray exposure produced using a first size of the tube focus is entered into one of the memories, and this signal is subtracted in the difference stage from a video signal for an X-ray exposure produced with a second size of the tube focus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.