GE Vivid S60

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Vivid S70 / S60 – User Manual 5-53
BC092760-1EN 01
Scale
CF, TVI Adjusts the repetition rate of the Doppler pulses transmitted to acquire the data for
color flow mapping. The Scale (Nyquist limit) should be adjusted so that no aliasing
occurs, while still having good resolution of velocities. The Nyquist limit should be
somewhat above the maximum velocity found in the data.
Doppler Enables the vertical scale of the Doppler spectrum and the maximal detectable
velocity to be modified. Velocity range directly controls the pulse repetition
frequency, which is responsible for the setting of the Nyquist limit (the ability to
detect maximum velocity without aliasing).
Baseline
CF Adjusts the color map to emphasize flow either toward or away from the probe.
Baseline is available in both Live and Freeze.
Doppler Enables the Doppler baseline to be shifted up and down. The default Doppler
baseline is set at the center of the vertical aspect of the Doppler display, dividing
evenly the flow toward and away from the probe. By adjusting the baseline a larger
portion of the analysis is assigned to the flow direction present. Baseline is
available in Live and Freeze, including CW.
TVI Adjusts the color map to emphasize tissue motion either toward or away from the
probe. Baseline is available in both Live and Freeze.
Invert
CF Enables the color scheme assigned to positive and negative velocities to be
inverted. Invert is available in live and cine replay.
Doppler Enables the Doppler spectrum to be flipped 180 degrees, so that negative
velocities are displayed above the baseline and positive velocities below the
baseline. Invert is available in live and cine replay.
TVI Enables the color scheme assigned to positive and negative tissue velocities to be
inverted. Invert is available in live and cine replay.
TT Enables the color scheme assigned to the tissue displacements to be inverted.
Invert is available in live and cine replay.
SRI Enables the color scheme assigned to strain rate to be inverted. Invert is available
in live and cine replay.
SI Enables the color scheme assigned to shortening and elongation tissue
deformation to be inverted. Invert is available in live and cine replay.
Variance
CF Controls the amount of variance data added to a color display. Variance enables
computer-aided detection of turbulent flow (e.g. jets or regurgitation). Variance is
available in live and cine replay.