High-contrast X-ray image detecting apparatus

Claim 1

An X-ray image detecting apparatus comprising: an X-ray source; a collimator plate placed between said X-ray source and an object whose X-ray image is to be detected, said collimator plate being provided with two-dimensionally arrayed X-ray collimating through holes to make a plurality of thin X-ray beams from widely diversing X-rays from said X-ray source; an X-ray image receiving means for converting an X-ray image projected thereon to an electric image signal, said X-ray image receiving means being devised so as to detect said X-ray image with the same divided into pixels so that said electric image signal may be outputted in the form of pixel signals from said X-ray image receiving means; a collimator plate displacing means for moving said collimator plate two-dimensionally in parallel to said X-ray image receiving means so that the same may be scanned by said thin X-ray beams made by said X-ray collimating through holes provided in said collimator plate; a memory means having addresses corresponding to said pixels for storing said electric image signal in the form of the pixel signals; and a signal comparator means for comparing, with regard to each of said addresses of said memory, a previously sampled and stored value of a pixel signal with a succeedingly sampled value of the pixel signal and replacing the contents of each address with a succeedingly sampled pixel signal if the latter value is larger than the former one, such that each of the addresses in said memory may finally store the maximum value of a corresponding pixel signal which varies showing a peak in the process of the scanning of a corresponding X-ray beam made by said collimator plate.