The Uultrasound in (physics) , refers to sound with a frequency that humans can not hear. it , iIt is a medical test that uses high-frequencies above 20 000 Hertz, higher than the human range of hearing , by Ttransmission as a mechanical energy through solid, liquid , gases, or body structure to capture a live (real time ) image that shows the internal structure and bmovement odyf organs movemensuch as t likhe ( bladder, brain, kidney, liver, ..etc.), and can provide valuable information for diagnosing and treating a variety of diseases and conditions., It depends on the computerized analysis of reflected ultrasound waves by piezoelectric element that convert t electric pulse to ultrasound waves and inversely .