X-ray or gamma ray systems or devices – Beam control – Antiscatter grid
Patent
1986-04-21
1988-07-26
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Antiscatter grid
378151, 378181, G21K 100
Patent
active
047605898
ABSTRACT:
An improved radiological device comprising a grid cabinet and an X-ray cassette tray, including: means for cassette size sensing disposed in the cabinet and allowing for automatic collimation of an X-ray beam by a direct mechanical linkage of sensing components with shutter controls; means for centering a cassette including two pivotal arms pivoting about respective points positioned in two different places on the tray; ball rolling slides for all linear movements; means for actuating a grid frame being very compact and disposed in the back of the cabinet and, firstly, accelerating the grid substantially instantaneously to high speeds for very short exposure times; secondly, slowing the grid down for medium exposure times; and thirdly, reversing the grid travel direction at random points.
REFERENCES:
patent: 2132774 (1938-10-01), Brown
patent: 2767323 (1956-10-01), Stava et al.
patent: 2938120 (1960-05-01), Forsyth
patent: 4099063 (1978-07-01), Pury et al.
patent: 4105920 (1978-08-01), Pury et al.
patent: 4232227 (1980-11-01), Finkenzeller et al.
patent: 4538293 (1985-08-01), Cutter
Church Craig E.
Freeman John C.
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