[Object] An object is to provide a brain activity measuring apparatus and a brain activity measuring method that can precisely ensure reproducibility of measurements for a plurality of measurements made separately for a number of times using functional magnetic resonance imaging. [Solution] In an MRI apparatus 10, a data processing unit 32 determines rigid transformation between an original tomographic image obtained in a past measurement and stored in a storage unit 36 and a pilot tomographic image obtained in a present imaging session such that mutual information between the original and pilot tomographic images is locally maximized; and based on a parameter of the determined rigid transformation, position and direction of a slice image of the tomographic image in the present imaging session are corrected.
BRAIN ACTIVITY MEASUREMENT DEVICE AND BRAIN ACTIVITY MEASUREMENT METHOD