The intensity of an ultrasound beam is defined as the power in a beam divided by the area of the beam.
Intensity of the ultrasound beam is defined as the concentration of energy in the beam i.e. Intensity is the rate at which energy passes through the unit area and is an important quantity when discussing bioeffects and safety.
Intensity = power/beam area
Thus it is measured in Watts per cm^2.
The mechanical bioeffect of ultrasound refers to damage caused by the actual oscillation of the sound wave on tissue. The most common is referred to as cavitation and is caused by the oscillation of small gas bubbles within the ultrasound field.
To know more about ultrasound field.
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