Cicek et al. present a 3D convolutional network architecture for volumetric segmentation in the biomedical domain from sparse annotations. In particular, they propose the architecture shown in Figure 1, closely related to earlier work . The network combines a decode stage, consisting of several convolutional and pooling layers, with a decoder part consisting of a series of convolutional and up-convolutional layers. Key to their model is that the loss function disregards voxels labeled as "unlabeled". Therefore, the network can be trained using volumes where only a few slices are densely labeled. They further utilize heavy data augmentation including rotations, gray value augmentation and smooth deformations.
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