Corpus Luteum segmentation goal and contour initialization. (a) Unprocessed ultrasound image containing a corpus luteum; a small irregularly shaped cystic cavity is visualized within the CL. (b) Manual segmentation of the CL by a human expert. (c) A circular initial contour placed within the CL in the image in (a). (d) The surface (ψ) of the initial signed distance function in which the contour is embedded.
Rusnell et al. Reproductive Biology and Endocrinology 2008 6:33 doi:10.1186/1477-7827-6-33