Slit diaphragm system defining X-ray examination zone with visible light and for passing X-ray radiation to the defined zone
US5136627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Aug 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
At least one primary diaphragm comprises two elements displaceable so as to form a linear fan-shaped beam which is incident on an object to be examined. The elements form the slit-shaped aperture forming the fan beam in their normal X-ray beam forming position and are moveable to a respective, selectable limit position perpendicularly to the fan shaped beam in order to define and mark an examination zone greater in cross-section area than the fan beam with a light beam. Light incident on the examination zone is restricted by the diaphragm elements in their limit positions, thus marking the examination zone with the light beam. X-ray exposure of the object to be examined takes place only when the elements are between the two positions defining the examination zone of the primary diaphragm where its diaphragm elements occupy in their respective limit positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.