Table 2.

Summary of the Variables and Definitions Used in This Text

Parameter or variable	Role
G	Structural network of N nodes
V	Set of nodes of G
vi	ith node of G
E	Set of edges of G
C	SC matrix
	Element of C
	Weighted degree of node i
L	Laplacian of C
	ith eigenvalue of L
	ith eigenvector of L
	Diagonal degree matrix of L
	Diffusion rate
	Neuronal loss in the i region
Ni	No. of voxels in ith region Ri
Φ	Atrophy spread due to neuronal loss

SC, structural connectivity.