A PET device for providing an excellent quantitative feature by a proper correction of a scattered radiation effect while enhancing a resolution in a restructured image and keeping a good photon pair detection sensitivity. A judging unit (52) judges whether or not a line connecting mutually respective light receiving surfaces (15b) of a pair of photon detecting elements (15a) that has detected photon pair simultaneously crosses any one of slice collimators (21n). Coincidence information for which it is judged that the line crosses none of the slice collimators (21n) is stored in a first coincidence information storing unit (53), and a signal sinogram is generated. Coincidence information for which it is judged that the line crosses any one of the slice collimators (21n) is stored in a second coincidence information storing unit (54), and a scattered sinogram is generated. An image restructuring unit (60) corrects the effect of a scattered component in a signal sinogram based on a scattered sinogram, and an image is restructured based on this corrected signal sinogram.
PET DEVICE AND IMAGE GENERATING METHOD FOR PET DEVICE