Cam-controlled automatic dynamic focusing for computed tomograph

Details Cam-controlled automatic dynamic focusing for computed tomograph Cam-controlled automatic dynamic focusing for computed tomograph

1990-03-21

1991-01-22

Howell, Janice A.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 7, 378147, 378154, 378155, A61B 600, G21K 100

Patent

active

049875817

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-rays. A source of X-rays is movable toward or away from the detector module. The module comprising 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: 4096391 (1978-06-01), Barnes
patent: 4731806 (1988-03-01), Takahata

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