For more complicated statistical models, we suggest that SurfStat [Worsley] should be considered. Surfstat is a free software tool which performs statistical analysis of univariate and multivariate surface and volumetric data using linear mixed effects models and random field theory. All the exercises are designed for using the graphical user interface GUI. Running this script completes the same task in the batch mode.
Install Unzip the package and move the folder to an appropriate place, denoted as SpharmMatDir in the rest of the documentation. However, they may not work on different computing environment from where they were compiled.
Therefore, to make sure that they work on your computer, you can compile LocalSmoothing. How to compile simple. Be aware of the difference in area distortion calculation between a voxel surface and its corresponding triangulation; see ADC Calculation for Voxel Surface and Its Triangulation. Three steps are involved to obtain a SPHARM shape descriptor: Spherical parameterization creates a continuous and uniform mapping from the object surface to the surface of a unit sphere, and its result is a bijective mapping between each point on a surface and a pair of spherical coordinates and :.
SPHARM expansion expands the object surface into a complete set of spherical harmonic basis functions , where denotes the spherical harmonic of degree and order and it is essentially a Fourier basis function defined on the sphere. The expansion takes the form: , where and. The Fourier coefficients up to a user-desired degree can be estimated by solving a linear system. The object surface can be reconstructed using these coefficients, and using more coefficients leads to a more detailed reconstruction.
The first two steps are necessary for modeling an individual shape, while the third step is mainly for group analysis. However, 3D surfaces are in general represented as triangular meshes. Data Preparation : Preprocess 3D binary image data. Documents : Forums : messages in 2 forums. Bookmark this page. Neuroimaging Resources Registry. Neuroimaging Data Repository. Cloud Computing Environment. Member login Register Help. Toggle navigation.
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Papers documentation Lateral ventricle morphology analysis via mean latitude axis posted by Beatriz Paniagua on Oct 15,
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