X-ray apparatus servo system
US4210815A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/587
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An x-ray receptor is translatable in x and y directions relative to the angulation axis of an x-ray source. Servo motors angulate the source and receptor coordinately with translation so the central ray of the x-ray beam from the source will be perpendicular to the input plane of the receptor when an x-ray exposure is made. New circuitry prohibits making an exposure until the source and receptor are properly angulated. Potentiometers develop signals corresponding with x and y distances and these are divided to get a servo motor command signal corresponding with the tangent of the angulation angle .theta.. Potentiometers driven coordinately with the receptor and source produce respective sets of signals corresponding with true instantaneous or real time angles .theta. and tangent .theta.. The first tangent .theta. command signal is continuously compared with the other tangent .theta. signals and the first tangent .theta. signal is independently compared with the actual angle .theta. with separate window comparators. As long as any pair of signals do not compare, the x-ray tube power supply is disabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.