If you have a major issue, say a tumor, MRI is great, but for smaller things I agree with you that a single image is not great for a quantitative assessment. Wh

If you have a major issue, say a tumor, MRI is great, but for smaller things I agree with you that a single image is not great for a quantitative assessment. What does have a lot of value is when you have a baseline image and you perform yearly scans that are compared against each other (similar to how carotid ultrasounds are used for cholesterol assessment)