MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Doppler ultrasound scanning of the blood flow in a patient's leg. A doctor is moving an ultrasound probe (transducer) on the patient's leg. The scan is seen on the screen, with the flow of blood being orange. Doppler ultrasound scanning detects moving fluids, such as blood, by frequency changes caused when high-frequency sound waves are reflected from the moving fluid. This can be used to check whether the blood supply is healthy.
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