X-ray CT apparatus having focal spot position detection means fo

Details X-ray CT apparatus having focal spot position detection means fo X-ray CT apparatus having focal spot position detection means fo

1994-05-20

1995-11-21

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378113, 378207, A61B 600

Patent

active

054694299

ABSTRACT:
An X-ray computerized tomographic (CT) apparatus capable of facilitating alignment of focal spot position at the time of replacing an X-ray tube anew and capable of easily correcting the focal spot position even when the focal spot position of the X-ray tube is deviated. Thereby, the focal spot position of the X-ray tube remains fixed in a predetermined position. The X-ray computerized tomographic (CT) apparatus includes an X-ray tube which is freely movable in at least one of a horizontal direction and a vertical direction; a detection unit for detecting a dislocated degree of the focal spot position of the X-ray tube; and a controlling unit for automatically controlling the focal spot position of the X-ray tube based on data obtained from the detection unit so that the focal spot position of the X-ray tube remains fixed in a predetermined position. In a case where the CT apparatus is used for a helical scanning operation, the detection unit may further include a detection timing controller for controlling an instance of detection and alignment of the focal spot position by utilizing only an output of the X-ray amount detected at a predetermined position of a gantry.

REFERENCES:
patent: 3965357 (1976-06-01), Hounsfield
patent: 4211925 (1980-07-01), Fairbairn
patent: 4675891 (1987-06-01), Plessis et al.
patent: 4827494 (1989-05-01), Koenigsberg
patent: 4991189 (1991-02-01), Boomgaarden et al.
patent: 5065420 (1991-11-01), Levene

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