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(a) 3D segmentation label and landmark positions on an example CM model. (b) An example simulation image using DeepDRR. (c) Overlay of the 2D segmentation mask and landmark heatmaps on the cropped image in (b). (d) Extraction of the 2D centerline from a segmentation mask consists of dilation, edge and distance map computation, and finally, shortest path extraction. (e) A simplified illustration of the centerline-based 2D/3D registration geometry.
