Patent ID: 6188749
Filing Date: 2001-02-13
Classification: G21K

Abstract:
An X-ray examination apparatus comprising:an X-ray source,an X-ray detector, andan 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 whereinthe filter elements communicate per row with a row duct, containing an X-ray absorbing liquid, by way of their first ends,the filter elements communicate per column with a column duct, containing an X-ray transparent liquid, by way of their second ends, andthe X-ray filter is provided with a pressure control system for adjusting the liquid pressure independently in individual row ducts and individual column ducts.