发明名称 |
Directional variable small cross-sectional X-ray or gamma ray beam generating diaphragm with rotating helical slits |
摘要 |
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.
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申请公布号 |
US5038370(A) |
申请公布日期 |
1991.08.06 |
申请号 |
US19900494041 |
申请日期 |
1990.03.14 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
HARDING, GEOFFREY;MERKELBACH, PETRUS;THISSEN, FRANCISCUS L. A. M. |
分类号 |
G21K1/00;G21K1/04;G21K5/02;H05G1/00 |
主分类号 |
G21K1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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