X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1990-03-14
1991-08-06
Westin, Edward P.
X-ray or gamma ray systems or devices
Beam control
Scanner
378147, G21K 510
Patent
active
050383701
ABSTRACT:
The invention relates to an arrangement for generating an X-ray or gamma beam with small cross-section and variable direction, having an X-ray or gamma emitter, from the focus of which a bundle of rays emerges, and a diaphragm arrangement, which cuts out a beam from the bundle of rays and comprises a hollow-cylindrical first diaphragm body which is rotatable about its axis of symmetry and has two mutually offset helical slits on the circumference. In this arrangement, an X-ray beam with at least approximately square cross-section is cut out on a relatively long hollow-cylindrical body with small diameter by the slits winding around the diaphragm body in at least one turn each and being shaped in such a way that at least one straight line runs through the slits towards the focus, the position of which line can be varied by turning the diaphragm body.
REFERENCES:
patent: 3766387 (1973-10-01), Heffan et al.
patent: 3832564 (1974-08-01), Hall et al.
patent: 3894234 (1975-07-01), Mauch et al.
patent: 4480332 (1984-10-01), Strecker
patent: 4750196 (1988-06-01), Harding
patent: 4769829 (1988-09-01), Webb et al.
Harding Geoffrey
Merkelbach Petrus
Thissen Franciscus L. A. M.
Chu Kim-Kwok
Squire William
U.S. Philips Corporation
Westin Edward P.
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