GE Vivid 7 User Manual

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Color Mode controls
Color Mode assignable controls
Horizontal sweep (Color M-Mode only)
Adjusts the horizontal refresh rate of the M-Mode area of the 
display.
Scale
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...

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Cineloop (in Freeze, Color 2D mode only)
Starts cineloop acquisition.
Color-Mode Soft menu controls
Sample volume
Adjusts the size of the color flow Doppler sampling area. Lower 
setting gives better flow resolution while a higher setting 
increases sensitivity and helps to locate turbulent flows.
Tissue priority
Emphasize either the color of the color mode or the greyscale 
tissue detail of the 2D image. Tissue priority is available in both...

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Trackball controls
ROI (Region Of Interest) size
When the trackball command Size is selected (see also 
’Trackball operation’ on page 59), the height and width of the 
color area (or ROI) is adjusted from the trackball.
ROI (Region Of Interest) position
When the trackball command Pos (position) is selected (see 
also ’Trackball operation’ on page 59), the position of the color 
area (or ROI) is adjusted with the trackball. 

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Using Color Mode
Color 2D
1. From an optimized 2D image press COLOR.
2. Use the trackball to position the ROI frame over the area 
to be examined.
The assignable con-
trols of the trackball 
are displayed in the 
trackball status bar 
in the bottom right 
corner of the screen.3. Press TRACKBALL. The instruction Size should be 
highlighted in the trackball status bar. If not, press 
TRACKBALL again to select Size.
4. Use the trackball to adjust...

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Optimizing Color Mode
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 Color Mode display:
• Adjust the Active mode gain to set the gain in the color 
flow area.
The scale value may 
affect FPS, Low Ve-
locity Reject, and 
Sample Volume.• Adjust Scale to the highest setting that provides adequate 
flow...

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PW and CW Doppler
PW and CW Doppler over view
 Figure 3-8: The PW/CW Doppler Mode screen 
1. Sample volume (PW 
only)
2. Angle correction 
marker
3. Velocity scale
4. Low velocity reject
5. Nyquist velocity
6. Doppler baseline
7. Frequency scale 
(optional, see 
page 398)
8. Status window:
9. Soft menu
Controls marked with R 
are also available in 
freeze and cine replay. 

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 Figure 3-9: The PW/CW controls on the front panel 
1. Assignable keys:
• Horizontal sweep R
• Scale
• Baseline R
• LVR
• Invert R
• LPRF (in PW mode)
• Color maps R
MORE
• Quick angle
• Angle correction
2. Zoom:
• Display zoom
• HR zoom
3. Img Size:
• Small/large 2D display
• Top/bottom display
• Side by side display
4. Soft menu:
• Sample Volume (PW)
• Compress R
• Reject R
• Frequency
• Frame rate
• Angle Corr. R
• Power
5. Freeze
6. CW
7....

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PW and CW Doppler controls
PW and CW Doppler assignable controls
Horizontal sweep
Adjusts the horizontal refresh rate of the Doppler area of the 
display. Horizontal sweep is available in live and cine replay.
Scale
Adjusts the velocity scale to accommodate faster/slower blood 
flow velocities. Velocity scale determines pulse repetition 
frequency.
Baseline
Enables the Doppler baseline to be shifted up and down. The 
default Doppler baseline is...

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raised beyond a certain limit, more than one Doppler gate is 
displayed on the screen.
Color maps
Displays a drop down menu of different Doppler colorization 
maps.Use the trackball to select the desired map and press 
SELECT to activate the map.
Quick angle and Angle correction
In non-cardiac ap-
plications, Angle 
correction is con-
trolled from the 
Trackball.Enables correction of the Doppler velocity scale by defining the 
angle between the...

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Frame rate
Adjusts the frame rate. The relative setting of the frame rate is 
displayed in the status window (under 2D).
Power
When power is re-
duced, it reduces 
the signal-to-noise 
ratio, so that the im-
age may become 
noisier.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 permitted by the FDA. The Thermal 
Index (TI) and the Mechanical...