Provided is a cognitive impairment prediction device with which it is possible to present, through a specific numeric index, the possibility of incidence of cognitive impairment in a subject by using an extremely simple computation process. This cognitive impairment prediction device photographs the brain of a subject using an MRI device on a first photography date. The cognitive impairment prediction device calculates a first GM-BHQ for which the average value of gray matter quantity data is calculated from an MRI image file group in which the brain of the subject is photographed. The cognitive impairment prediction device photographs the brain of the subject using the MRI device again on a second photography date on which a prescribed period has elapsed since the first photography date. The cognitive impairment prediction device calculates a second GM-BHQ for which the average value of gray matter quantity data is calculated from an MRI image file group in which the brain of the subject is photographed. The cognitive impairment prediction device then calculates a trend from the first GM-BHQ to the second BM-BHQ and computes a period extending until the GM-BHQ of the subject will reach a cognitive impairment line.
COGNITIVE IMPAIRMENT PREDICTION DEVICE