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13 Cards in this Set

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Spectral analysis
Determining the individual doppler shifts that are present in a Doppler signal and the importance of each
Spectral broadening
The addition of many doppler signals (waveform or color)
Fast Fourier Transform
Analysis of complez doppler signals w/ an algorithm
Dwell Time
sampling time used by FFT, the PRP times the number of pulses used along one line of sight
Color encoding
the darker the color, the slower the flow
Color saturation
intro of white into a color. Regions w/ high velocity flow are displayed by increased color saturation (a lighter color)
Hue color coding
Giving each velocity its own color
Asynchronous systems
Collect data at different times
Bad sensitivity, good lateral resolution, slow FR
Synchronous systems
Collect 2 sets of data at the same time
Bad axial resolution, high FR
Tissue Bruit
In a high stenosis, high vibrations make their own frequency in the surrounding tissue and make a color signal
Color noise
Very weak echoes are sometimes assigned a color instead of a weak gray color (usually Doppler is set too high)
Color bleed
When color is extended out of the region where it originated (turn down Doppler)
In color doppler, we analyze the:
In PW doppler, we analyze the:
color represented
spectral broadening