Table 1.

Beam widths as a function of power intensity with a fixed 25% duty cycle

Power intensity (W/cm2)	Acoustic negative pressure (MPa)	−6 dB Beam width (mm)
0.3	0.13	14.4
0.5	0.15	14.4
1.0	0.22	12.0
1.5	0.25	12.0
2.0	0.30	12.0
3.0	0.37	12.0
4.0	0.46	12.0
5.0	0.48	12.0

The transducer was positioned 50 mm away from the hydrophone in a 37 °C water bath. Acoustic pressure measurements, in 0.5mm size steps, were done along the transducer width, covering a total distance of 19 mm.