Panoramic X-ray imaging apparatus

Details Panoramic X-ray imaging apparatus Panoramic X-ray imaging apparatus

1996-02-08

1997-02-04

Wong, Don

X-ray or gamma ray systems or devices

Specific application

Dental panoramic

378 40, 378 988, A61B 614

Patent

active

056006993

ABSTRACT:
The present invention provides a panoramic imaging apparatus capable of obtaining a clear tomographic image even when the rotation speed of a swivel member changes. The clock for driving an FFT CCD device in accordance with the TDI method is set on the basis of the angular speed .omega. of the arm detected by a tachogenerator and a function value f (.theta.) which responds to the rotation angle .theta. of the swivel member detected by an angle detector and used to determine a tomographic orbit. The angle detector is provided with a cam having a shape having been set in accordance with the relationship between the rotation angle .theta. and the film feeding speed at the time of performing X-ray panoramic imaging by using photographic films. The signal of the angular speed .omega. and the signal of the function value f (.theta.) corresponding to the angle .theta. are added by an analog multiplier, and subjected to frequency modulation by a V/F converter to create a TDI clock.

REFERENCES:
patent: 4878234 (1989-10-01), Pfeiffer et al.
patent: 4995062 (1991-02-01), Schulze-Ganzlin et al.

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