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AssigneeU.S. Philips Corporation
InventorsMenno W. J. Prins, Johannus W. Weekamp, Jacobus B. Giesbers, Michel C. J. M. Vissenberg, Coenraad A. A. M. Vugts
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The invention relates to an X-ray apparatus which includes an adjustable X-ray filter. In order to adjust an intensity profile of the X-ray beam, an X-ray absorbing liquid is transported to filter elements of the X-ray filter. Such transport is susceptible to gravitational forces which lead to an irregular hydrostatic pressure distribution in the X-ray filter. In order to reduce the effects of the gravitational forces on the transport of the X-ray absorbing liquid, the duct connecting the filter elements to the reservoir is subdivided into sub-ducts and the reservoir is subdivided into chambers, each chamber being connected to at least one sub-duct. The X-ray apparatus also includes means for keeping the sub-ducts aligned with a horizontal plane.
An X-ray examination apparatus for forming X-ray images of an object, which apparatus includes an X-ray source for generating an X-ray beam, an X-ray filter which is provided with filter elements which are arranged to contain an adjustable quantity of X-ray absorbing liquid in order to adjust an intensity profile on an object, and with a supply duct for connecting the filter elements to a reservoir for the X-ray absorbing liquid, an X-ray detector for receiving a part of the X-ray beam, having traversed the object, in order to detect an X-ray image, characterized in that the supply duct includes sub-ducts, and that each of the sub-ducts connects at least one of the filter elements to the reservoir.
An X-ray filter provided with filter elements which are arranged to contain an adjustable quantity of X-ray absorbing liquid in order to adjust an intensity profile on an object, and a supply duct for connecting the filter elements to a reservoir for the X-ray absorbing liquid, characterized in that the supply duct includes sub-ducts, each of which connects at least one of the filter elements to the reservoir.
Dependencies are inferred from the claim text.