X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1994-01-27
1996-07-23
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 63, 378 987, H05G 164
Patent
active
055397980
ABSTRACT:
An X-ray radiographic apparatus comprises an X-ray tube having an X-ray focal point for radiating X-ray beams toward an object being examined, an X-ray beam limiting device incorporating a limiting member making an aperture for limiting the X-ray beams passing therethrough, the aperture being adjustable in size, and an element for obtaining a surface image of the object through the aperture. The obtained surface image is utilized in various aspects. One aspect is control of the size of the aperture by comprising an element for forming a frame image representing the aperture in accordance with a given size information, an element for displaying the surface image on which the frame image is superposed, a specifying element for being able to specify by hand a size of the frame image by giving the size information to the frame image forming element, and an element for driving the limiting member so that the size of the aperture is brought into a size specified by the aperture displayed on the surface image displaying element. Another aspect concerns positioning using a reference image and automatic exposure control.
REFERENCES:
patent: 4246607 (1981-01-01), Vijverberg
patent: 4472826 (1984-09-01), van de Ven
patent: 4769701 (1988-09-01), Sblebitz et al.
patent: 4875225 (1989-10-01), Hunold
patent: 4907252 (1990-03-01), Aichinger
Asahina Hiroshi
Kanebako Toyomitsu
Nakayama Hiroshi
Ozawa Masahiro
Yamada Naoki
Church Craig E.
Kabushiki Kaisha Toshiba
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