Scanning mammography system with reduced scatter radiation
US4969174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Sep 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K1/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Method and apparatus for minimizing scatter in an X-ray imaging system of the type including a controllable source of X-ray radiation and means for collimating the X-ray radiation into a fan-shaped beam and effecting scanning of the X-ray beam across a target area. The improved system includes a grid assembly extending in a transverse direction across the target area and having a relatively narrow width in the beam scanning direction. A drive is coupled to the grid removing the grid in synchronism with the X-ray beam and an X-ray impervious belt is coupled to the grid and extends in a transverse direction across the target area and is movable with the grid for covering the target area outside the grid to prevent scatter radiation from impinging on X-ray film located beneath the grid. In one form, the grid includes a plurality of air interspersed septa to allow reduced beam energy. In another form, the X-ray beam is collimated into a point source by the use of an X-ray impervious disk positioned adjacent to and overlaying an X-ray window in the X-ray source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.