Panoramic dental radiography image intensification employing minification techniques
US4287423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1979 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Nov 9, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/51
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Panoramic dental x-ray machine wherein an x-ray source-camera assembly orbits a patient seated thereinbetween. A slot in the camera assembly collimates the x-rays which are continuously generated by the x-ray source, which x-rays are converted to light images of the patient's dental arch structure by only a single intensifying screen which remains stationary. This screen comprises about 1/40 the area of conventional intensifying screens and is made thicker for providing improved detection efficiency. A fiber optic minifying lens reduces the size of the image from the screen while proportionately increasing the light intensity of the image, thus making it possible to provide useable film images at reduced x-ray exposures due to non-linear film exposure versus optical density characteristics. The resultant minified, light-intensified image may now be recorded on 35 mm roll film, for example, as opposed to standard radiographic film of 5".times.12" size, or 12.70 cm.times.30.48 cm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.