GE Vivid 7 User Manual

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Using PW/CW Doppler modes
Controls and opera-
tions for PW and 
CW mode are the 
same unless other-
wise noted.There are two ways to start PW/CW Doppler:
Alter native 1:
1. Press PW or CW. A scanning screen is displayed with a 
Doppler cursor on the 2D mode image and a Doppler 
spectrum in the lower part of the screen.
2. Use the trackball to position the Doppler cursor line and in 
PW the sample volume location over the area of interest....

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The Doppler Power 
setting affects only 
Doppler operating 
modes.•  Adjust Power to obtain an acceptable image using the 
lowest setting possible. This is particularly important in CW 
mode, as the energy duty cycle is 100% (constant).
Adjust the following settings to further optimize the display of 
the image.
• Use the Horizontal sweep to optimize the sweep speed.
•  To view signal detail, use the Velocity range to enlarge the 
vertical...

Scanning Modes
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Tissue Velocity Imaging (TVI)
TVI over view
 Figure 3-10: The TVI Mode screen 
1. Color sector marker
2. Status window:
3. Soft menu
Controls marked with R 
are also available in 
freeze and cine replay. 

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 Figure 3-11: The TVI Mode controls on the front panel 
Tissue Velocity Imaging (TVI) calculates and color-codes the 
velocities in tissue. The tissue velocity information is acquired 
by sampling of tissue Doppler velocity values at discrete points. 
The information is stored in a combined format with greyscale 
imaging during one or several cardiac cycles with high 
temporal resolution.
1. Assignable keys:
• 2D Width
• Scale
• Baseline R
•...

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TVI controls
TVI assignable controls
2D width
Controls the angular width of the 2D image sector.
Lower scale value 
allows greater depth 
and lower Nyquist 
limit.Scale
Adjusts the repetition rate of the Doppler pulses transmitted to 
acquire the data for color mapping.The Scale value influences 
the Nyquist limit (the ability to detect maximal velocity without 
color-aliasing).
Invert
Enables the color scheme assigned to positive and negative...

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Alter native assignable controls
Press ALT to access to the following modes:
•  Curved Anatomical M-Mode (see page 98)
•  Tissue Synchronization Imaging (see page 142)
•  Tissue Tracking (see page 125)
•  Strain rate (see page 130)
• Strain (see page 136)
TVI Soft menu controls
Frame rate
Controls the line density. When adjusting frame rate, there is a 
trade off between spatial and temporal resolution.
Compress
Controls the amount of color...

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Baseline
Adjusts the color map to emphasize tissue motion either toward 
or away from the probe. Baseline is available in both Live and 
Freeze.
When power is re-
duced, it reduces 
the signal-to-noise 
ratio, so that the im-
age may appear 
noisier.Power
Controls the amount of acoustic power applied in all modes. 
When power is set to maximum, it is equal to or less than the 
maximum acoustic power level permitted by regulatory 
standards. The...

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Using TVI
1. Select the desired probe.
2. While in 2D mode press 
TVI on the control panel.
Optimizing TVI
Refer to page 400 
about creating pre-
sets.The use of preset gives optimum performance with minimum 
adjustment. If necessary, the following controls can be adjusted 
to further optimize the TVI display:
The Scale value also 
affects the frame 
rate. There is a trade 
off between the 
frame rate and 
quantification 
noise.•  To reduce...

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Tissue Tracking
Tissue Tracking over view
 Figure 3-12: The Tissue Tracking Mode screen 
1. Color sector marker
2. Tissue Tracking 
color bar
3. Status window
4. Soft menu
5. Track start and track 
end markers
6. Tracking start and 
end from R-peak
Controls marked with R 
are also available in 
freeze and cine replay. 

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 Figure 3-13: The Tissue Tracking controls on the front panel
Tissue Tracking calculates and color-codes the displacement in 
the tissue over a given time interval, typically the systole. The 
displacement is defined as the distance the tissue move during 
this time interval. The displacement is found as the time 
integral (sum) of the tissue velocities during this interval.
Only displacements in the beam direction are found. Only 
positive...