Patent Number: 061887498
Section: claims

1. An X-ray examination apparatus comprising: an X-ray source,  an X-ray detector, and  an X-ray filter which is arranged between the X-ray source and the X-ray detector, wherein the X-ray filter comprises a plurality of filter elements having an X-ray absorptivity which can be adjusted by controlling a quantity of X-ray absorbing liquid within the individual filter elements in a matrix arrangement of rows and columns, which filter elements communicate with the X-ray absorbing liquid by way of a first end an X-ray transparent liquid by way of a second end; and wherein 2. An X-ray examination apparatus as claimed in claim 1, wherein individual filter elements are formed by cylinders having a cross-section of a diameter smaller than 5 mm. 3. An X-ray examination apparatus as claimed in claim 1, wherein individual row ducts and individual column ducts are provided with respective valves, and the pressure control system is arranged to control the valves. 4. An X-ray examination apparatus as claimed in claim 1, wherein individual filter elements are provided with a piston for separating the X-ray absorbing liquid from the X-ray transparent liquid. 5. An examination apparatus as claimed in claim 4, wherein the piston is provided with a coating layer. 6. An X-ray examination apparatus as claimed in claim 1, wherein the X-ray absorbing liquid and the X-ray transparent liquid are not miscible. 7. The apparatus of claim 6 wherein the X-ray absorbing liquid comprises an aqueous solution and the X-ray transparent liquid comprises an oil.