tern is also strongly dependent on the characteristics of the ultrasound probe.)</p>

<p>To account for these different effects, the ultrasound phantom must similarly be heterogeneous across multiple scales. In this example, a scattering phantom is created by modulating the mean sound speed and density at each grid point using random Gaussian noise. To simulate bulk tissue contrast, three spherical regions with increased scattering and impedance are defined using <code><a href="makeBall.html">makeBall</a></