Radiography of moving objects is advanced problem when dynamic range of acquired radiograms is restricted by limited exposition time. Exposition time has to be as short as to avoid images blurring due to object moving. It is possible to increase dynamic range by summing of short time radiograms set when periodical object movement is presented as in the case of heart beating for instance. Non periodical movement can be studied using tools of image correlation technique on other hand. Short time radiograms are fitted into corresponding positions and consequently summed for higher data statistic as will be presented in this paper.