Method and apparatus for panoramic radiography
US5224140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1992 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/51
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention concerns a method and apparatus for narrow-beam tomography in which x-ray radiation is aimed to pass through the object to be radiographed onto a movable (v.sub.1) x-ray film (F). The object (P) is kept stationary in a certain position, while the x-ray source and the film cassette (14) are rotated about a vertical virtual axis of rotation (A-A). In the first operating mode for the panoramic radiography of the dental arch the patient (P) is supported by positioning means so that the sharply imaging plane (P-P) is located between the virtual axis of rotation (A-A) of the x-ray beam (X) and the film plane. In the second operating mode for the radiography of transversal projections of the dental arch (L) the patient (P) is supported in such a stationary position that the virtual axis of rotation (A-A) of the x-ray beam (X) is located in the area between the sharply imaging tissue layer (P-P) and the film plane (F). In the second operating mode the film (F) is moved in a direction which is opposite to the film transfer direction in the first operating mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.