Variable detector aperture
US4466112A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1982 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | Jan 29, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/612
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a rotating fan beam tomographic scanner there is included a variable detector aperture housed within a radiation scatter shield. The scanner includes a diverging source of penetrating radiation which is directed toward a patient receiving section for passing a fan shaped beam of radiation through a planar section of the patient. The incident radition beam is attenuated during its passage through the patient receiving section and the transmitted beam passes from the patient receiving section until it impinges on a plurality of detectors for eventual reconstruction into a visible image. The variable detector aperture controls the thickness of the fan shaped beam and hence limits the amount of radiation impinging on the detectors. The aperture includes a pair of elongated beam thickness defining members having an opening therebetween and rotatable relative to the scanning plane. The opening between the two members in a direction transverse to the scanning plane defines the thickness of the attenuated fan beam passing therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.