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11 Cards in this Set
- Front
- Back
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extracting the low Doppler frequency from the tx's carrier frequency is called
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Demodulation
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Doppler Shift equation
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Reflected frequency - Transmitted frequency
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doppler shifts are created when
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transmitted sound waves strike moving red blood cells
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Doppler Shift is ______ related to velocity
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Directly
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Doppler shift is ______ related to frequency of transmitted sound
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Directly
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True Velocity
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measured then the blood cells are parallel to the sound beam; 0° angle
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Percentage of the true velocity depends on
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the cosine of the angle
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Doppler shift is _______ related to the cos of the angle, however, _______ related to the angle.
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Directly; Indirectly. cos0°=1 cos60°=.5 cos90°=0
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Advantage of Continuous wave doppler
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accurately measures high velocities, no aliasing
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disadvantages of continuous wave doppler
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range ambiguity- cant tell where the reading came from
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highest Doppler or velocity that can be measured without aliasing
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Nyquist Limit
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