X-ray or gamma ray systems or devices – Beam control – Filter
Patent
1997-09-22
1999-03-02
Porta, David P.
X-ray or gamma ray systems or devices
Beam control
Filter
378159, G21K 300
Patent
active
058781110
ABSTRACT:
Filter (3) for absorbing X-rays (2), having a controllable field-generating matrix arranged on a housing (7). The matrix generates electric or magnetic fields acting on liquids (13, 14) located in the housing. The housing (7) has at least one first and one second chamber (9, 10) which are separated in a sealed fashion from one another by means of a flexible diaphragm (8). The first and second liquids (13, 14) are located in the first and second chambers (9, 10) respectively, and differ in their X-ray absorption characteristics. At least one of the liquids is a magneto-rheological or an electro-rheological liquid, depending on the type of matrix provided. In operation, a minimum pressure is applied to at least one of the liquids, and the localized fields produced by the matrix cause the liquids (13, 14) to alter their respective thickness ratios, to provide a an X-ray filter having location-specific absorption characteristics.
REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 5559853 (1996-09-01), Linders et al.
patent: 5625665 (1997-04-01), Fokkink et al.
patent: 5751786 (1998-05-01), Welters et al.
patent: 5768340 (1998-06-01), Geittner et al.
Porta David P.
Siemens Aktiengesellschaft
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