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doppler principles

basic doppler

doppler shift returned frequency - transmitted frequency
doppler frequency is between.. 2-10MHz
average speed of sound in tissues 1540 m/s
antegrade flow will be above/below the baseline? above
frequency shift is affected by what? transmitted doppler frequency, doppler beam "angle to flow", velocity
Which angle results in a max frequency shift? 0 degree
advantages of CW doppler? detect flow in all vessels, useful for obtaining systolic pressures, No aliasing
what are some ways to eliminate aliasing? ^PRF; decrease freq shift (higher angle or decrease transmitted freq); eliminate triplex
a large SV/gate is related to spatial pulse length
How to generate a color image? autocorrelation
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
Power Doppler can be used for what type of flow? Trickle flow
This artifact has been referred to as a "ghost" artery mirror-image artifact
Increasing focal zones increase lateral/axial resolution? Lateral
when the doppler can not differentiate the main sample voume from those of phantoms range gate ambiguity
Created by: amandarose01