Device for slit radiography with image equalization

Claim 1

A slit radiography assembly, which comprises: an X-ray source; an X-ray detector for recording radiation passing through a body being radiographed; a slit diaphragm positioned between said X-ray source and said body for forming a substantially planar X-ray beam; means for scanning said body with said planar X-ray beam; an X-ray adsorption means for influencing said planar X-ray beam during scanning movement; a two dimensional dosimeter for ionizing radiation corresponding to a width of said planar X-ray beam and to a height of total scanning distance, said dosimeter including a system of essentially parallel striplike electrodes disposed on a support extending in a direction of scanning and slightly curved to compensate for distortion caused by planar geometry for forming sector-wise signals from detected quantities of X-ray radiation transmitted through said body and a system of parallel counterelectrodes extending at right angles to the direction of scanning and connected to a multiplexer device connecting one or more of said counterelectrodes to an operating voltage in synchronization with scanning; a control means for receiving signals from said parallel electrodes and for forming control signals corresponding to sector-wise signals from detected quantities of X-ray radiation; and means for transmitting said control signals to said X-ray adsorption means.