Fig. 1
From: The cholinergic system in subtypes of Alzheimer’s disease: an in vivo longitudinal MRI study
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13195-020-00620-7/MediaObjects/13195_2020_620_Fig1_HTML.png)
a Regions of interest (ROIs) depicted in colors and b examples of Alzheimer’s disease subtypes. Alzheimer’s disease subtypes are based on patterns of brain atrophy classified according to the different visual rating scales. Abbreviations: A, anterior; P, posterior; R, right; L, left