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Representative liver ROI segmentation results on the test set in Group A by U-Net and Attention U-Net. (a–d) Liver B-mode ultrasound images, (e–h) manual delineation as the reference standard, (i–l) segmentation images by Attention U-Net, (m–p) segmentation images by U-Net. The white pixels in the segmentation images represented the segmented liver region, and the black pixels represented the segmented non-liver region. ROI: region of interest.
