[Problem] To improve the setting accuracy of site regions in brain image data. [Solution] A brain image data processing device 100 is provided with: a brain image data reading means for reading brain image data in which site regions for identifying each site in the brain are set in positions corresponding to each site; a probability calculating means for calculating, with respect to each pixel in the brain image data read by the brain image data reading means that is not included in any site region, a probability that each pixel is included in each site region, on the basis of the distance between each pixel and each site region; and a determining means for determining the site region to which each pixel belongs, on the basis of the probabilities calculated by the probability calculating means.
BRAIN IMAGE DATA PROCESSING DEVICE, BRAIN IMAGE DATA PROCESSING METHOD, AND BRAIN IMAGE DATA PROCESSING PROGRAM