Table 4.

Ablation study for U-Net, wide U-Net, MSU-Net, Res MSU-Net(0), and Res MSU-Net(1).

Architecture	BUL	EM	NS
	M ± SD	M ± SD	M ± SD
U-Net (Ronneberger et al., 2015)	0.608 ± 0.037	0.884 ± 0.007	0.675 ± 0.018
wide U-Net (Ours)	0.643 ± 0.025	0.889 ± 0.016	0.677 ± 0.012
MSU-Net (Ours)	0.708 ± 0.011	0.900 ± 0.001	0.702 ± 0.010
Res MSU-Net (0) (Ours)	0.713 ± 0.032	0.900 ± 0.001	0.704 ± 0.010
Res MSU-Net (1) (Ours)	0.628 ± 0.025	0.848 ± 0.056	0.675 ± 0.022

Wide U-Net is obtained by extending the width of the U-Net network. The wide U-Net has the same number of parameters as the MSU-Net. Res MSU-Net (0)/Res MSU-Net (1) are proposed based on Residual multi-block. Intersection over Union (IoU) is used as the evaluation metric for comparison. Bold values represent the best results.