Table 2.

Performance of the six lung segmentation networks.

Model	IoU	Dice
U-Net [54]	0.962	0.980
LinkNet	0.967	0.983
R2U-Net [50]	0.928	0.962
Attention U-Net	0.951	0.974
U-Net++ [52,53]	0.936	0.966
CE-Net	0.964	0.981

* Bold font indicates the network with the best performance.