1. A method of controlling an x-ray radiation imaging apparatus, the method comprising: performing prior information acquisition by obtaining at least one correction threshold energy, at which a theoretical x-ray radiation intensity of at least one predetermined threshold energy is measured, using a difference between an x-ray radiation intensity calculated in an ideal condition and an x-ray radiation intensity measured actually; and performing x-ray radiation image acquisition using a photon counting x-ray radiation detector, by obtaining at least one x-ray radiation image using the at least one correction threshold energy, wherein the at least one predetermined threshold energy and the at least one correction threshold energy indicate energies above which x-ray radiation is measured.