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. Author manuscript; available in PMC: 2012 Jun 3.
Published in final edited form as: Phys Med Biol. 2010 Apr 30;55(10):2961–2982. doi: 10.1088/0031-9155/55/10/011

Figure 1.

Figure 1

(a) Front and back views of a tessellated cylinder (flattened for display purposes with the cylinder axis aligned horizontally), (b) top views of the cuboidal phantom, and (c) top and bottom views of the Digimouse atlas showing eigenfunctions corresponding to the 20 smallest eigenvalues of the Laplace–Beltrami operator. The index k varies from 1 to 20 sorting the eigenvectors in an ascending order of eigenvalues. The basis functions are orthogonal and, therefore, have both positive and negative values at various points.