Meshfree strategy for diffuse optical tomography image reconstruction

Diffuse optical tomography (DOT) is widely researched all over the world as a functional optical imaging modality. To solve the complicated photon propagation model in arbitrary geometry in clinical applications, finite element method (FEM) is commonly employed, and a dual mesh scheme is always used to achieve enough accuracy in forward problems and reasonable solutions in highly ill-posed inverse problems. In this contribution, meshfree method is introduced to calculate photon distribution on target surface and a double node set scheme is adopted in image reconstruction. Burdensome mesh generation and modification processes of FEM are avoided, more accuracy in forward calculation and more robustness in image reconstruction can be achieved. The performance of the proposed method is shown in simulation experiments.