Work on image reconstruction for the fibre-optic US/PA systems:
– Motivation: to find/create a reconstruction algorithm that is robust to uncertainty in sensor position/movement and to limited data.
– Initial idea: to estimate sensor location from US data by trilateration (triangulation)
— Simulation using FOCUS, Field II, and k-wave
— Results showed that trilateration is only reliable with point sources, but not much else –> idea abandoned
– Second idea: use model-based reconstruction
— PA simulation using k-wave
— Reconstruction using Total Variation regularisation
— Results showed the robustness of approach: reasonable reconstruction was achieved using only three sensors.
2D simulation result (sensor position indicated by arrows in left subplot). Left subplot: initial pressure, Right subplot: reconstructed initial pressure
Plan: continue work on model-based reconstruction, test approximation error method to account for error in sensor position.
Gustavo Santos