X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1987-11-19
1989-10-03
Howell, Janice A.
X-ray or gamma ray systems or devices
Beam control
Collimator
378153, 378147, H01J 3516
Patent
active
048721913
ABSTRACT:
A dynamic focusing device is provided for an X-ray scanner, the device comprising at least one detector module located in a position to receive, be illuminated by, and respond to X-ray. A source of X-rays is movable toward or away from the detector module. The module comprises a plurality of crystals each having a scintillation surface located in a common plane, with a plurality of septa separating the crystals. The septa have a height which is upstanding above the surfaces of the crystals far enough to reduce lateral X-ray scatter and to cast a shadow upon the surfaces of the crystals responsive to an illumination thereof from said X-ray source. The invention dynamically positions the detector module relative to the distance between the detector module and the source of X-rays in order to reduce substantially to a minimum any shadow in the X-rays cast by the septa upon the surfaces of the crystals.
REFERENCES:
patent: 3197638 (1965-07-01), Sinclair
patent: 4229651 (1980-10-01), Danos
patent: 4277684 (1981-07-01), Carson
patent: 4340818 (1982-07-01), Barnes
patent: 4675893 (1987-06-01), Drinker et al.
Bio-Imaging Research, Inc.
Howell Janice A.
Hynds Joseph A.
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