(I) The intensity of a wave is the rate of power through a unit region perpendicular to the direction of propagation. The unit of intensity is watts per square meter (W/cm2).
(ITA) The time average intensity is the average ultrasound intensity calculated over the time between pulses.
Time average intensity = Pulse average intensity x Duty factor
For ultrasound systems, the instantaneous intensity is averaged over one or more scan repetition periods for a specified scan mode.
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