Which one of the following statements about the Doppler principle is false?
A) Doppler refers to a change in frequency in which the motion of laminar or turbulent flow is detected within a vascular structure.
B) The beam should be perpendicular to the flow.
C) The Doppler shift is directly proportional to the velocity of the red blood cell.
D) If the red blood cell moves away from the transducer, then the fall in frequency is directly proportional to the velocity and direction of the red blood cell movement
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