A radiation imaging apparatus includes: a radiation emitter configured to emit radiation toward an object and to move around the object at a same time a radiation detector configured to detect the radiation emitted from the radiation emitter, to change the detected radiation into a signal, and to store the signal and an irradiation controller configured to control the radiation emitter so that the radiation is emitted toward the object in a first position around the object and so that no radiation is emitted toward the object in a second position corresponding to the first position.
