When we observe the motion of blood using Doppler shift of ultrasound, the targets are blood cells. Which of the following best describes the method?
A) The blood cells are moving receivers; the transducer is a stationary source.
B) The blood cells are stationary emitters; the transducer is a moving source.
C) The blood cells are first receivers, and then they are emitters of an echo; source and receiver are moving toward each other.
D) The blood cells are first receivers, and then they are emitters of an echo; source and receiver are moving away from each other.
Correct Answer:
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