X-ray or gamma ray systems or devices – Specific application – Tomography
Patent
1983-01-17
1984-05-22
Smith, Alfred E.
X-ray or gamma ray systems or devices
Specific application
Tomography
378197, A61B 602
Patent
active
044505752
ABSTRACT:
X-ray apparatus for tomography and other procedures. For tomography, a column is translated longitudinally parallel to the patient supporting table top. An x-ray tube is supported on the column above the table top for angulating about a laterally extending axis at a constant elevation on the column. A bucky carriage for containing a film is mounted under the top for moving longitudinally. A fulcrum arm is pivotally connected at one end directly to the bucky carriage for pivoting on a laterally extending axis lying on the film plane. The other or upper end of the arm is connected to the x-ray tube for angulating it so the central ray of the x-ray beam is always directed to the center of the film during column translation. The upper end of the fulcrum arm is slidable relative to the x-ray tube angulation axis. An extensible and contractible link means below the bucky carriage pivotally connects at its upper end to the carriage and at its lower end to the column for swinging about a lateral axis that is vertically aligned with the x-ray tube axis. The link means pivots about a lateral axis on a support member whose elevation is adjustable relative to the film plane. The elevation of the link means pivot determines the height above the taple top of a fixed vertical axis about which the fulcrum arm swings and, hence, it determines the height of the plane in a body lying on the table top that will be imaged without blurring on the film.
REFERENCES:
patent: 3733487 (1973-05-01), Louche et al.
patent: 3838287 (1974-09-01), Barrett et al.
patent: 4087694 (1978-05-01), Hellstrom et al.
patent: 4095110 (1978-06-01), Bunch
patent: 4315156 (1982-02-01), Sell
General Electric Company
Grigsby T. N.
Smith Alfred E.
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