X-ray image intensifier photofluorography apparatus for correcting the brightness of the output image

Abstract

An X-ray image intensifier photofluorography apparatus for correcting the output image brightness while photographing an optical image of a subject in an optical camera through a lens system by amplified light into which X-rays are converted after passing from an X-ray source through the subject to an X-ray image intensifier, wherein filter means whose X-ray permeability is represented by an axially asymmetric form relative to the central horizontal axis between the X-ray source and X-ray image intensifier to correct the distribution of the intensity of X-rays emitted from the X-ray source. The X-ray permeability of the filter means is adjusted by changing a length of X-ray path or the thickness of the filter means through which X-rays are transmitted. The thickness of the filter means is determined in consideration of the distribution of the intensity of X-rays emitted from the X-ray source and the distribution of brightness of each of light images from the X-ray image intensifier and from an optical lens system. Adjustment of the distribution of the X-ray intensity by the filter means enables the light image to be photographed with a suitable brightness corresponding to the X-ray permeability of the subject on a film received in the optical camera.

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