Carotid doppler ultrasound cpt code1/2/2024 The technologist applies a small amount of gel to the area under examination and places the transducer there. The same principles apply to sonar used by boats and submarines. The transducer sends out inaudible, high-frequency sound waves into the body and listens for the returning echoes. Some exams may use different transducers (with different capabilities) during a single exam. The transducer is a small hand-held device that resembles a microphone. Ultrasound machines consist of a computer console, video monitor and an attached transducer.
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