Method and a device for carrying out constant enlargement in pan

Details Method and a device for carrying out constant enlargement in pan Method and a device for carrying out constant enlargement in pan

1994-01-07

1995-01-31

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Dental panoramic

378 39, 378168, A61B 614

Patent

active

053864492

ABSTRACT:
The invention relates to a method used in the panoramic X-ray photography of a patient's set of teeth and a device for carrying out constant enlargement also in those spots (21) of the dental arch where the X-ray beam (12) is not perpendicular to the tangent (23) of the dental arch (20). Constant enlargement is achieved by selecting, on the film (13), a speed profile which follows the formula: v.sub.f =((A+B/A).times.v1.times.1/ cos (b), where v.sub.f is the speed of the film, v.sub.1 is a component of the propagation speed of the intersection of the X-ray beam and the spot to be photographed which is perpendicular to the X-ray beam, A is the distance between the focus of the X-ray source and the spot to be photographed, B is the distance between the spot to be photographed and the film, and b is the angle between the tangent (23) of the spot in question of the dental arch and the normal (22) of the X-ray beam.

REFERENCES:
patent: 4228356 (1990-10-01), Cushman
patent: 4263513 (1981-04-01), Palluet
patent: 5267293 (1993-11-01), Virta

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