TABLE 5.

Performance of U-Net with different modules.

	U-Net	U-Net w/dense block	U-Net w/dual attention	Dense dual attention U-Net
A2C	0.8860	0.8969	0.8973	0.9025
A2C-V2C	0.8889	0.9044	0.9018	0.9113
A2C-LV	0.8814	0.8837	0.8716	0.8862
A2C-RV	0.8548	0.8932	0.8705	0.8905
Mean	0.8778	0.8945	0.8853	0.8976

A2C, image containing left and right atria only; A2C-V2C, image containing left and right atria and left and right ventricles; A2C-LV, image containing left and right atria and only left ventricle; A2C-RV, image containing left and right atria and only right ventricle. Numbers in bold font indicate better performance in each category.