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An ultrasound scan also referred to as a sonogram, diagnostic sonography, and ultrasonography, is a device that uses high-frequency sound waves to create images of the inside of the body. The sonographer usually holds a transducer; a hand-held device which is placed on the skin of the patient.
Doppler ultrasound depends on the Doppler Effect, a change in the wave's frequency that occurs from the motion of a reflector like a red blood cell. It is used to assess the flow of blood in a vessel, helping to determine the blood velocity and the obstructions in the blood pipes. It is often used to check the heart and the heartbeat of a growing fetus.