Medical Imaging Systems · Ultrasound Imaging · 1 mark · Numerical answer
A 5 MHz Doppler probe measures maximum shift 3 kHz at 45° to blood flow. Sound speed in blood is 1500 m/s. Find maximum flow velocity to two decimals in m/s.
For backscattered Doppler ultrasound, Δf=2f0v cosθ/c. Thus v=3000×1500/[2×5×10⁶×cos45°]≈0.6364 m/s, rounded to 0.64. The factor two accounts for the outgoing and returning Doppler shifts.
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