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Chapter 19 Doppler
Terms in this set (99)
Doppler frequency (shift)
change in frequency
relative motion between sound source and receiver
Doppler shift equation
reflected frequency - transmitted frequency
Creation of a frequency shift
created when transmitted sound waves strike moving RBC.
Positive Doppler shifts occur when?
RBCs move towards the transducer
reflected freq. higher than transmitted freq.
Negative doppler shifts occur when?
RBCs move away from the transducer
reflected frequency lower than transmitted frequency
doppler shift = 2 x velocity of blood x transducer frequency x cos0 / propagation speed
Doppler shift and velocity of blood cell relationship
Doppler shift and transducer frequency relationship
Data in doppler shift is measured in ____ the derived information is measured in _____.
velocity (m/s) -more clinically relevant
X axis of doppler spectrum represents
Y axis of doppler spectrum represents
Doppler shift or velocity
Doppler shift represents ___% of true velocity when blood flow is ___ to the sound beam.
Measured velocity =
True velocity x cosine angle
0 and 180 degrees has a cosine of
1 and -1
100% true velocity
at 90 degrees doppler shifts
cannot be measured
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