A method for creating a time reversed signal adapted to destroy a soft tissue, the method comprising emitting a first ultrasonic signal from a transmitter towards a tissue simulating medium which simulates said soft tissue, wherein the first ultrasonic signal has a first frequency characteristic; receiving the first ultrasonic signal in a receiver and converting the first ultrasonic signal to an electrical signal; converting the electrical signal to a digital signal; and time-reversing the digital signal to produce the time-reversed signal.
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