X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1985-04-05
1987-02-03
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378 41, 378147, 378150, 378152, G21K 104
Patent
active
046413359
ABSTRACT:
A primary-beam collimator for a stereo radiographic x-ray diagnostic installation has an x-ray tube with dual focal points (F1, F2) arranged at a distance from each other. Shutter leaves (1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b) are provided, and adjustable so that two beam pyramids (I from focal point F1, and II from focal point F2) can be individually controlled. Two internal shutter leaves (4a, 4b) are provided for restricting the beam in planes perpendicular to the stereo base F1-F2. These are adjustable between two external shutter leaves--each in the direction of its corresponding external shutter leaf. The internal shutter leaves (4a, 4b) are constructed so that, when adjusted to their external positions, they permit the emission of a central beam-pyramid from a central focal point (FN) and, together with the external shutter leaves (2a, 2b), they close the external shutter openings.
REFERENCES:
patent: Re25118 (1962-01-01), Graves
patent: 2214621 (1940-09-01), Leishman
patent: 3683186 (1972-08-01), Tompkins
patent: 4246488 (1981-01-01), Hura
patent: 4566112 (1986-01-01), Linde et al.
Church Craig E.
Freeman John C.
Jay Mark H.
Siemens Aktiengesellschaft
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