Method and apparatus for panoramic radiogragraphy
US5267293A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | May 4, 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 a narrow x-ray beam (X) emitted from an x-ray source (12) is aimed to pass through the object area to be radiographed onto a transferrable x-ray film (F). The object area to be imaged in the patient (P) is kept stationary in a certain preset position, while the x-ray source (12) is rotated about a virtual axis of rotation (R.sub.0) and the film cassette (14) is simultaneously transferred. In the first imaging mode for the panoramic radiography of the dental arch (L), the patient (P) is supported by patient positioning means (20 . . . 30) so that the sharply imaging plane is located between the virtual axis of rotation and the film plane. In addition to said first imaging mode, the panoramic x-ray apparatus is adjustable for a specific mandibular joint imaging mode in which the patient is supported in the panoramic x-ray apparatus using said patient positioning means (20 . . . 30). The speeds (v.sub.R, v.sub.1) of the rotating motor (31) and the film transfer motor (32) in a frame part (15) supporting the x-ray source (12) and the film cassette (14) are varied, or alternatively, the profiles of said sp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.