Experimental simulations of ultrasonic field time-development in 3D ultrasonic transmission tomography

The contribution presents the preliminary results of the 4D simulation (time-development in 3D space) of the ultrasonic field in the experimental computerized transmission tomography system. The temporal development is synthesized here from the dynamic-steady-state 3D harmonic simulations (based on Helmholtz formulation) by linearly combining those using proper complex weights. The results of the proposed method are then qualitatively compared to the measurements from the real equipment. The level to which the 4D simulations can be compromised by the used approximate boundary conditions is discussed. The ultimate aim of these simulations is to get better insight into the physics of the ultrasonic computed transmission tomography, which would enable better image reconstruction.