Hi there @lwbarker, thank you for your reply. I was going on what my mom's neurologist shared with me. It's all still quite new to me, too. Learn as I go. Apparently an MRI is a biomarker for detection . Here's some info that breaks down what MRI testing can and can't do regarding Alzheimer's or dementia:

~ https://www.nia.nih.gov/health/alzheimers-symptoms-and-diagnosis/how-biomarkers-help-diagnose-dementia

Hoping the article provides clarity. Have a pleasant evening.