MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Finger blood flow. Power Doppler ultrasound scan of blood (orange) flowing through a normal finger. Doppler ultrasound scanning detects moving fluids, such as blood, by the frequency change caused when high-frequency sound waves are reflected from the moving fluid. Power Doppler scans detect movement, but not the direction of the movement.
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