X-ray examination apparatus including an x-ray filter
AssigneeU.S. Philips Corporation
InventorsJohannes Marra, Wilhelmus J. J. Welters
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Abstract
An X-ray examination apparatus (1) is provided with an X-ray source (2) and an X-ray detector (5) wherebetween there is arranged an X-ray filter (6) which includes filter elements (7) whose X-ray absorptivity can be adjusted by controlling the quantity of X-ray absorbing liquid (31) in individual filter elements (7). The filter elements (7) are formed by spaces between electrically conductive tracks (9) provided on parallel plates (8). The parallel plates are arranged in a reservoir (31) for the X-ray absorbing liquid. The liquid level in the vicinity of an electrically conductive track is controlled on the basis of an electric voltage applied to the relevant electrically conductive track (9).
Claims20
An X-ray examination apparatus including an X-ray source, an X-ray detector for picking up the X-ray image, and an X-ray filter which is arranged between the X-ray source and the X-ray detector, the X-ray absorptivity of the X-ray filter being locally adjustable by control of a local quantity of an X-ray absorbing liquid in the X-ray filter, characterized in that the X-ray filter is provided with substantially parallel plates with electrically conductive portions, and that a quantity of X-ray absorbing liquid between respective parallel plates can be controlled.
Dependencies are inferred from the claim text.