There are many tests to tell you the risk of developing dementia, which is only a "probability" number. Darmiyan's brain maps show (and measure) the actual pathology (neurodegeneration) in the brain, at microscopic resolution.

There is currently no other method to detect and quantify micro-structural abnormality in the brain at presymptomatic stages of dementia, which is one of the main reasons why all clinical trials of Alzheimer's test drugs keep failing, one after another.