Extended Finite Element Method with Simplified Spherical Harmonics Approximation for the Forward Model of Optical Molecular Imaging

Figure 4

Surface detector readings 𝐽⁺ for SP_𝑁 equations around the regular heterogeneous phantom using the two methods on the coarse mesh compared with the FEM on the fine mesh. (a) DA equations. (b) SP₃ equations. (c) SP₇ equations. (d) Comparison among the results of XFEM for DA, SP₃, and SP₇ equations.

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