Active energy selective x-ray image detection
US5221843A · kind A · utility
Inventor
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for energy selective x-ray image detection. A source produces two fluxes of x-ray radiation with two different energy spectra. The fluxes are sequentially incident on the subject then on two layered planar detectors with control means. Examples of planar detectors are stimulable phosphor screens or intensifying screen/photographic film detectors. Examples of control means are visible light sources or electric generators with stimulable phosphor screens or light valves with intensifying screen/film detectors. A sequencer uses control means to selectively enhance the response of a predetermined detector to corresponding sequential radiation flux. The predetermined response can be chosen to enhance the inherent energy selectivity of the layered detector e.g. the first detector preferentially responds to low energy while the second detector preferentially responds to high energy x-ray photons. Planar detectors are used so that the layered detector fits in a cassette compatible with film cassettes used in medical radiography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.