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3D U-Net Architecture and 2-step method. Top row: Architecture of the 3D U-Net used in the architecture. Two bottom rows: description of the 2-step method. Middle row: description of step1, «High resolution» corresponds to images with a dimension of 176 × 240 × 256 with voxels of size 1 mm3; «Low resolution» corresponds to images down-sampled to a dimension of 72 × 96 × 104. Step1 output is thresholded at 0.1 for visualization purposes. (2 column fitting image).
