“…As discussed in prior work, this model difference is likely primarily associated with an existing approximation in the scattering model, where the incident beam on each point on the sampled SDH surface is modelled by using the same waveform and time of flight [14]. A new beam model option [15] provided in CIVA UT 2016 was also tested here. However, the echodynamic curve results for CIVA UT 2015 and 2016 are nearly the same.…”