Table 1. Microbubble response to ultrasound beams of different amplitude.

Amplitude of Incident beam	Mechanical Index	Microbubble response	Acoustic behavior
Low amplitude	< 0.07	Linear oscillation	Linear backscatter
Medium Amplitude	0.07 to 0.3	Nonlinear oscillation	Nonlinear backscatter
High amplitude	> 0.4	Disruption	Transient high energy/non linear echoes