Fig. 1From: The cholinergic system in subtypes of Alzheimer’s disease: an in vivo longitudinal MRI studya 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, leftBack to article page