X-ray or gamma ray systems or devices – Specific application – Dental panoramic
Patent
1992-02-14
1993-06-29
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Dental panoramic
378 40, A61B 614
Patent
active
052241408
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.
REFERENCES:
patent: 4599739 (1986-07-01), Nishikawa
patent: 4741007 (1988-04-01), Virta
patent: 4783793 (1988-11-01), Virta
patent: 4833699 (1989-05-01), Gardner
Muller Timo
Strommer Pekka
Virta Arto
Church Craig E.
Planmeca Oy
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