X-ray or gamma ray systems or devices – Specific application – Dental panoramic
Patent
1990-01-09
1991-07-16
Westin, Edward P.
X-ray or gamma ray systems or devices
Specific application
Dental panoramic
378 38, 378 40, 378170, 378175, 378191, 378168, A61B 614, G03B 4204, G03B 4202
Patent
active
050330705
ABSTRACT:
A panoramic method for the radiography of the dental arch and jaws, in which method by means of movable radiographing and/or imaged elements, several subsequent exposure sweep sequences are performed so that the moving elements are transferred to a new position betwen the subsequent exposure sequences. In order to achieve a perfectly jointed X-ray picture, the movement of the moving elements is started before the switch-on instant of the X-ray beam in the latter exposure sequence and the starting positions of said elements is selected so as to obtain desired positions and velocities for the elements at the switch-on instant of the X-ray beam. The coincidence of the X-ray beam orientation at the start of the latter exposure sequence with the X-ray beam orientation at the end of the preceding sequence is characterizing to an embodiment of the invention.
REFERENCES:
patent: 4783793 (1988-11-01), Virta et al.
Kanerva Heikki K. J.
Mustalahti Pasi T.
Ojala Olli J.
Tammisalo Erkki H.
Orion-yhtyma Oy
Westin Edward P.
Wong Don
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