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Bony anatomy and skin surface of the L and R feet, as extracted from a CT DICOM dataset (0.5 mm slice thickness x 250 slices). This example highlights the inherent difficulty in using CT number segmentation to extract bony anatomy - there are some significant holes present in the structure. When the CT number threshold window was expanded to close these holes, part of the soft tissue was included in the segmentation, corrupting the bony structure. Sometimes even bony segmentation it is not as s