The radiation tomography apparatus

The radiation tomography apparatus of the present invention, radiation is irradiated by the radiation source from multiple directions around the subject, a radiation detector for detecting radiation transmitted through the subject from their multiple directions, the subject mounted, the reconstruction of setting a bed capable of moving the object to the body axis direction, the reconstruction parameters including the amount of movement of the bed to the body axis direction for reconstructing an image of the subject and parameter setting means, and the reconstructed view range calculation means for calculating the reconstruction view range for the at least one data segment needed for reconstruction calculation that is determined for each spatial location to reconfigure based on the reconstruction parameters that the set, the reference segment position setting means calculated reconstructed view range to set the reference segment position by a phase signal obtained by kinetic analysis of the subject An effective segment calculating means for calculating as an effective segment using a predetermined weight function for the data segment containing the set reference segment position, an image creating means for creating an image by reconstructing the effective segment the calculated, the provided. Thus, it provides the radiation tomography apparatus capable of achieving both temporal resolution improvement and unnecessary radiation exposure reduction.