Table 6.

Multi-model augmentation comparison on the CEUS domain-shift test.

Backbone	Augmentation	CEUS Dice	CEUS IoU	CEUS Boundary F1	CEUS HD95 (px)	CEUS Pixel ECE
U-Net	Standard	0.439 (0.162)	0.296 (0.141)	0.024 (0.028)	202.2 (66.0)	0.374 (0.114)
U-Net	Combined	0.469 (0.201)	0.328 (0.170)	0.051 (0.032)	199.4 (63.4)	0.273 (0.135)
Residual U-Net	Standard	0.468 (0.190)	0.326 (0.167)	0.037 (0.035)	199.7 (65.2)	0.314 (0.143)
Residual U-Net	Combined	0.476 (0.192)	0.334 (0.171)	0.041 (0.032)	197.6 (64.4)	0.297 (0.138)
Attention U-Net	Standard	0.429 (0.175)	0.289 (0.146)	0.035 (0.028)	204.5 (65.9)	0.328 (0.132)
Attention U-Net	Combined	0.477 (0.177)	0.331 (0.156)	0.038 (0.022)	197.0 (62.9)	0.257 (0.136)