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Typical types of ultrasound, focused shock wave, and pressure wave. (A) Ultrasound waves are periodic oscillations with a limited bandwidth. (B) Focused shock wave is characterized by a single positive pressure wave (100 MPa), followed by a negative pressure wave (−10 MPa). The 1 microsecond (μs) of time interval is the positive pressure wave. (C) The pressure wave is 1 MPa positive wave and less than 1 MPa negative wave in 5 milliseconds (ms).
