According to one embodiment, a nuclear medicine diagnostic apparatus includes a processing circuitry. The processing circuitry acquires coincidence count data indicating an occurrence position of each of coincidentally counted pair-annihilation events, based on pieces of output data of a plurality of detectors that detect gamma rays emitted from radio isotopes administered to an object. Further, the processing circuitry generates, each time a condition necessary for a filter process is satisfied, a filter image by performing the filter process on the coincidence count data.
