Provided is an apparatus and method for predicting dementia through segmentation of brain MRI images by brain regions. The method for predicting dementia through segmentation by brain region includes obtaining a brain MRI image from a subject; Dividing the obtained brain MRI image into a plurality of regions; Measuring brain capacity for each divided region; And Based on the deep learning model, predicting the likelihood of dementia through the measured brain capacity; Including, the step of dividing the brain MRI image into a plurality of regions is characterized in that it further comprises the step of dividing the brain MRI image in units of pixels using semantic segmentation (semantic segmentation).
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