Fig. 12a
Fig. 12b
Fig. 13
The delay is applied according to the focus depth, figure 13 shows the time between the
arriving echo front wave, figure 14 shows a wave front coming from an echo which is near
the probe, in figure 15 is further, as the echo is farther from
Fig. 14
the probe, the echo wave front is bigger, so the time between the wave front arrival at each
crystal is shorter, in figure 16 the echo is deeper, that´s why the wave front is the biggest of
three examples, and the time between the arrival of the wave fronts at the crystals is the
smallest of the three examples, so there must be a different delay