Abbreviations	Description
NMI	Normalized Mutual Information
NCC	Normalized Cross-Correlation
MI	Mutual Information
SSD	Sum of Squared Differences
SIFT	Scale–Invariant Feature Transform
ICP	Iterative Closest Point
HAMMER	Hierarchical Attribute–Matching Mechanism for Efficient Registration
3D ResNet	3D Residual Network
CNN	Convolutional Neural Network
MLP	Multi-Layer Perceptron
SURF	Speeded-Up Robust Features
B-spline	Basis Spline
MS-DIRNet	Multi-scale deformable network
FBA DLIR	Feedback Attention Deep Learning Image Registration
HRF	Hybrid registration framework
STN	Spatial Transformer Network
LSTM	Long Short-Term Memory