Fig. 2: Working principle of the MST algorithm.
From: Tracing multiple scattering trajectories for deep optical imaging in scattering media
a Roundtrip travel of waves to an object embedded within a scattering medium. Multiply scattered waves (blue arrows) change propagation directions multiple times, whereas the ballistic wave (red arrows) preserves its propagation direction when propagating through the scattering medium. b Modeling of the scattering medium by a discrete stack of phase plates. Each phase plate is described by a phase function \({\varphi }_{k}({{{{{{\boldsymbol{\rho }}}}}}}_{j})\) at a depth \({z}_{k}\). The object of interest is located at \({z}_{0}\). c Illustration of our forward model describing the reflection matrix \({{{{{\boldsymbol{R}}}}}}\) with a stack of discrete phase plates. For better understanding, the reflection process by the target object is shown to the right of the target.
