 updated based on a larger map of the scattering phantom (see schematic below). This has the effect of simulating a larger transducer in which the active elements are swept across the transducer.</p>

<img vspace="5" hspace="5" src="images/example_us_bmode_linear_transducer_01.png" style="width:648px;height:414px;" alt="">

<p>Note, the same result could be achieved by allocating the complete transducer and then progressively updating <code>transducer.active_elements</code>. However, this requires a larger 