Figure 2. Gain or loss in brain volume, as determined from serial MRI scans.
Using registration-based software, brain volume gain (red) or loss (blue) can be determined with sub-voxel accuracy from serial MRI scans. Currently, it is difficult to predict why some patients (left) have little atrophy (0·29% brain volume loss per year), whereas others (right) have a high atrophy rate (2·2% brain volume loss per year).