Process of generating the 3D structures of the calcaneus.
(A) Joints of the hindfoot containing the subtalar joint, calcaneocuboid joint and talonavicular joint combined with each other, which showed the blue clumps. These bones couldn’t be recognized automatically by surface rendering in 3D Imaging. (B) The calcaneus and other bones were labeled separately by 3D interactive and automatic segmentation. After the Enter key was clicked to start the computer processing, the color of labeled bones gradually turned red and green and then the division was finished automatically in one minute. (C) The calcaneus was marked red and others were marked green at last. (D) The calcaneus was extracted and other bones were deleted.