basic doppler
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| doppler shift | returned frequency - transmitted frequency
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| doppler frequency is between.. | 2-10MHz
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| average speed of sound in tissues | 1540 m/s
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| antegrade flow will be above/below the baseline? | above
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| frequency shift is affected by what? | transmitted doppler frequency, doppler beam "angle to flow", velocity
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| Which angle results in a max frequency shift? | 0 degree
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| advantages of CW doppler? | detect flow in all vessels, useful for obtaining systolic pressures, No aliasing
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| what are some ways to eliminate aliasing? | ^PRF; decrease freq shift (higher angle or decrease transmitted freq); eliminate triplex
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| a large SV/gate is related to | spatial pulse length
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| How to generate a color image? | autocorrelation
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| T/F Frame Rate is affected by the density or number of scan lines | True: the more lines, the more time to generate an image which decreases frame rate
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| Power Doppler can be used for what type of flow? | Trickle flow
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| This artifact has been referred to as a "ghost" artery | mirror-image artifact
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| Increasing focal zones increase lateral/axial resolution? | Lateral
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| when the doppler can not differentiate the main sample voume from those of phantoms | range gate ambiguity
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Created by:
amandarose01
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