Lecture 6 : Doppler Techniques: Physics, processing, interpretation . Doppler US Techniques . As an object emitting sound moves at a velocity v , the wavelength of the sound in the forward direction is compressed ( λ s ) and
Related searches for Lecture 6: Doppler Techniques: Physics, processing, interpretation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Physics, processing, interpretation
ftis transmitted frequency
fr is received frequency
v is the velocity of the target,
θisthe angle between the ultrasound beam and the direction of the target's motion, and
cis the velocity of sound in the medium
VProcessing of Doppler Ultrasound Signals
(a) before sampling; (b) after sampling
An ideal HT filter can be approximated using standard filter design techniques. If a FIR filter is to be used , only a finite number of samples of the impulse response suggested in the figure would be utilised.
which is band limited tofs/4, and a pair of quadrature pilot frequency signals given by
Hilbert transform method,
Complex FFT method, and
Spectral translocation method.