The theme of radiographic granularity is now found in a lot of literature, among which are famous three papers written by R. E. Sturm and R.H. Morgan, K. Rossmann and K. Doi, respectively. We obtained many results regarding wiener spectrum using FFT algorithm through the past ten years of researches on the radiographic granularity. In this symposium, the transition of ways of thinking about researches on the radiographic granularity, their points in issue and the process of their improvements are introduced, and this, we strongly expect to be useful for how to make researches into the discipline of radiological technology in future. Good ideas for the researches originate from such an attitude as making questions and careful observations and finding out what is concealed behind. It is so called hypothesis that poses concrete problems to such good ideas, and its verification is made through a series of processes including establishment of theory and method for measurements, planning, execution, arrangement of results, observations, discussion and conclusion. In the present report, three cases of measurements of radiographic granularity are presented as actual examples indicative of the process of such researches.