X-ray or gamma ray systems or devices – Source support – Including movable source
Patent
1992-05-08
1994-03-01
Porta, David P.
X-ray or gamma ray systems or devices
Source support
Including movable source
378196, 378205, H05G 102, A61B 602
Patent
active
052915409
ABSTRACT:
An X-ray tube for radiating an X-ray to an object and a detector for detecting the X-ray transmitted through the object are mounted on both ends of a C-shaped arm. The arm is supported by an arm holder such that the C-shaped arm can be slid along an arc portion of the C-shaped arm. The arm holder having a horizontal portion which is supported by a supporting member such that the arm holder rotates around the horizontal portion. The supporting member is suspended from the ceiling via a pole such that the supporting member rotates around the pole and moves in the X and Y directions. When the supporting member is rotated, the supporting member is moved in the X and Y directions in accordance with an angle of rotation such that the C-shaped arm rotates around an isocenter at which a center axis of a circle including the arc portion of the C-shaped arm crosses the horizontal axis of rotation of the arm holder. A control circuit for these operations includes a memory for storing data denoting a predetermined locus of the supporting member in accordance with an angle of rotation, a detector for detecting a locus of the supporting member during rotation, and a servo control loop for controlling movement of the supporting member in accordance with outputs from the memory and the detector.
REFERENCES:
patent: 4769832 (1988-09-01), Louiday
patent: 5038371 (1991-08-01), Janssen et al.
patent: 5052036 (1991-09-01), Grady
patent: 5081661 (1992-01-01), Larsson
patent: 5155757 (1992-10-01), Sakaniwa et al.
patent: 5159622 (1992-10-01), Sakaniwa et al.
Chu Kim-Kwok
Kabushiki Kaisha Toshiba
Porta David P.
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