X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1996-08-12
1997-04-29
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, 378 19, G01N 2300
Patent
active
056256612
ABSTRACT:
An X-ray CT apparatus includes an X-ray generator revolvable to describe a circular path on a plane of revolution, and having a plurality of X-ray focal spots (focal positions) arranged in a direction perpendicular to the plane of revolution; an X-ray detector opposed to the X-ray generator, and having a plurality of detecting elements arranged in a direction along a circumferential edge of the plane of revolution and in the direction perpendicular to the plane of revolution; a revolution controller for revolving the X-ray generator and the X-ray detector without varying a positional relationship therebetween, and outputting angle information; a moving device for moving the object introduced into a space between the X-ray generator and the X-ray detector, relative to the X-ray generator and the X-ray detector, during a revolution of the X-ray generator, in the direction perpendicular to the plane of revolution, by a distance exceeding a width of at least one of the detecting elements per revolution of the X-ray generator, the moving device outputting moving amount information indicative of the distance; an X-ray focal position controller for successively switching the plurality of focal positions of the X-ray generator in response to the revolution by the revolution controller, and outputting focal position information; and an image reconstruct unit operable in response to data from the X-ray detector, the angle information from the revolution controller, the moving amount information from the moving device, and the focal position information from the X-ray focal position controller, for reconstructing a three-dimensional image relating to the object by reversely projecting the data in helical form.
REFERENCES:
patent: 4002917 (1977-01-01), Mayo
patent: 4250425 (1981-02-01), Gabbay
patent: 4541107 (1985-09-01), Rossi et al.
Church Craig E.
Shimadzu Corporation
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