X-ray or gamma ray systems or devices – Source support – Including movable source
Patent
1989-01-18
1989-11-28
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Source support
Including movable source
378117, 378193, 378196, G03B 4116
Patent
active
048842931
ABSTRACT:
An X-ray photographing apparatus includes first and second systems for photographing an object from different directions. A first arm of the first system supports a first X-ray tube thereon and is arranged to be rotatable. A second arm of the second system supports a second X-ray tube thereon and is arranged to be rotatable. When at least one of the arms is rotated, interference between the arms is prevented by an interference preventing device. The device has a storing section storing data relating to relative positions between the arms when at least one of the arms is rotated while an iso-center, i.e., the crossing point of X-ray beams emitted from the X-ray tubes coincides with the rotational centers of the arms. When at least one of the arms is rotated while the iso-center shifts from the rotational centers for a distance, a detecting section of the device detects the distance, and an operation section calculates, on the basis of the data and the detected distance, a position where the arms interfere with each other and controls the rotation of the arms according to the calculated interference position. When the arms come near the calculated interference position, the operation section actuates an alarm.
REFERENCES:
patent: 2822477 (1951-11-01), Kizaur
patent: 3549885 (1970-12-01), Andersson
patent: 3659099 (1972-04-01), Bertheau
patent: 4426725 (1984-01-01), Grady
patent: 4501011 (1985-02-01), Hauck et al.
Fields Carolyn E.
Hynds Joseph A.
Kabushiki Kaisha Toshiba
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