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10 Cards in this Set
- Front
- Back
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Doppler Effect |
the change in frequency of the received signal related to the motion of the reflector. |
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The Doppler principle is used to measure red blood cell------- A. magnitude B. velocities c. volume |
B. velocities |
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The process of extracting the low Doppler frequency from the transducers carrier frequency is called--------- |
Demodulation |
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The Doppler effect is presented as a ------ when the source and receiver are ----------? |
Frequency shift, in motion to each other |
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Starting from the same point the sound source is moving toward the East at 12 MPH and the receiver is moving west at 10 MPH the Doppler shift is------? (+ or -) |
Negative because the source and receiver are moving apart. |
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Doppler shift produces information about ----? |
Velocity |
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At what angle between the sound beam and the direction of motion will the Doppler shift be the highest? |
zero degrees or 180 degrees |
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At what angle between the sound beam and the direction of motion will the Doppler shift be closest to zero? |
90 degrees no Doppler frequency exists because the cosine of90 is zero. |
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What is the difference between speed and velocity? |
Speed has only a magnitude. Velocity has magnitude and direction. |
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What is the current method of processing Doppler signals? |
FFT method of spectral analysis is used for PW and CW. Autocorrelation is the method of spectral analysis for color flow Doppler. |
