X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1989-09-06
1990-11-06
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Scanner
378155, G21K 510
Patent
active
049691740
ABSTRACT:
Method and apparatus for minimizing scatter in an X-ray imaging system of the type including a controllable source of X-ray radiation and means for collimating the X-ray radiation into a fan-shaped beam and effecting scanning of the X-ray beam across a target area. The improved system includes a grid assembly extending in a transverse direction across the target area and having a relatively narrow width in the beam scanning direction. A drive is coupled to the grid removing the grid in synchronism with the X-ray beam and an X-ray impervious belt is coupled to the grid and extends in a transverse direction across the target area and is movable with the grid for covering the target area outside the grid to prevent scatter radiation from impinging on X-ray film located beneath the grid. In one form, the grid includes a plurality of air interspersed septa to allow reduced beam energy. In another form, the X-ray beam is collimated into a point source by the use of an X-ray impervious disk positioned adjacent to and overlaying an X-ray window in the X-ray source.
REFERENCES:
patent: 4097748 (1978-06-01), Monvoisin
patent: 4203037 (1980-05-01), Gur et al.
patent: 4355409 (1982-10-01), Amplatz
patent: 4493098 (1985-01-01), Riihimaki et al.
Barrett David M.
McDaniel David L.
McFaul James A.
Pelc Norbert J.
Scheid Carl C.
Beusse James H.
Church Craig E.
General Electric Company
Skarsten James O.
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