Segmentation of 2-D and 3-D objects from MRI volume data using constrained elastic deformations of flexible Fourier contour and surface models
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2017, Graphical ModelsCitation Excerpt :They consist in flexible surfaces that are deformed from an initial user-provided configuration toward the boundary of the object to delineate. The deformation can be driven manually, by interactively modifying the parameters of the model, or automatically, by applying suitable energies [14,27]. Currently, 3D deformable models are described either implicitly, by level sets [2], or explicitly, by meshes [8,11] and parameterizations [9,25].
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2017, Medical Image AnalysisCitation Excerpt :This implies that the number of parameters (i.e., SPHARM coefficients) needed to describe a shape instance is lower than other shape modeling methods like PDM. In medical image, SPHARM has played an crucial role in 3D-shape representation and modeling of anatomic structures in several applications, including computer assisted diagnosis (Shen et al., 2004; Styner et al., 2004; 2006; Shen et al., 2009b; 2009a), rigid registration (Dillenseger et al., 2006; Shen et al., 2009b) and organ segmentation (Brechbühler et al., 1995; Székely et al., 1996; Kelemen et al., 1999; Gerig et al., 2001; Tateyama et al., 2012), among others. In most of these applications, statistical shape models were developed by applying PCA to a training population of organ surfaces parameterized with SPHARM coefficients, where eigenmodes of maximum variation around the mean shape were calculated.
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