Optical diffusion imaging using nonlinear multigrid optimization

Summary form only given. The measurement situation we consider involves multiple source and detector locations around the perimeter of a highly scattering domain. A frequency domain measurement involves modulating each light source with a CW signal and performing a coherent detection at this modulation frequency. The multiple scatter and absorption within the domain results in a spatially-dependant magnitude and phase of the light intensity (the measurement data). In particular, we have proposed an iterative coordinate descent optimisation, an ICD/Born method which provides high quality reconstructions and is computationally efficient when compared to the conventional iterative Born approximation methods. However, the computational complexity of ICD/Born is still prohibitive for large three dimensional problems perhaps more importantly, local optimisation methods such as ICD/Born can become trapped in local minimum.