Optimum contrast panoramic dental radiography and methods of providing therefor
US4228356A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Sep 1, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/51
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Panoramic dental X-ray machine includes a tubehead-camera assembly which employs, in its simplest embodiment, three vertically stacked image intensifiers, the totality of their radiation input faces being substantially similar in shape and dimensions to a slot in a front panel of the camera assembly, the input faces being secured against the slot and aligned therewith such that radiations passing therethrough must then pass through the image intensifiers. Means for selectively controllably varying the potential across each of the individual image intensifiers varies the electron gain of that image intensifier to thus provide optimal contrast between multi-density structures of the dental arch and surrounding areas on a full size radiograph.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.