GE Vivid 7 User Manual

Quantitative Analysis
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Deletion of a trace
The user can delete all traces at once or one at a time.
To delete all traces
1. If necessary, press TRACKBALL until the QA trackball 
assignment is selected.
2. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
3. Trackball to Delete all traces.
4. Press 
SELECT.
To delete one specific trace
1. If necessary, press TRACKBALL until the QA trackball 
assignment is selected.
2....

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Frame disabling
Frame disabling excludes the actual frame from the cineloop 
display. Frame disabling is available only with contrast data. 
There are two ways to disable a frame.
Disabling frames from the frame marker
To re-enable a 
frame: Press 
SELECT on the cor-
responding frame 
marker.
1. Trackball to the frame marker of the frame to disable 
beneath the Analysis window (see Figure 7-2).
2. Press 
SELECT to disable the frame. 
The...

Quantitative Analysis
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3. Press SELECT.
The current frame is disabled and the corresponding frame 
marker is displayed in red.
Re-enabling all frames
1. Trackball the cursor to the Frame marker axis.
2. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
3. Trackball to Enable all frames.
4. Press 
SELECT.
All previously disabled frames are re-enabled.
 Figure 7-2: Frame disabling
1. Analysis window
2. Frame marker...

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Optimizing sample area
The sample area can be reshaped and labelled.
Reshaping a sample area
There are two ways of modifying a sample area: either from the 
Update menu or by selecting the 
SAMPLE SHAPE assignable.
Reshaping a sample area from the Update 
menu
1. If necessary, press TRACKBALL until the QA trackball 
assignment is selected.
2. Trackball to the sample area to reshape.
3. Press 
UPDATE MENU in the trackball area on the...

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Press Set as default to return to the Quantitative analysis 
screen and keep the settings as default.
Reshaping a sample area from the assignables
This procedure allows to reshape either a free sample area or a 
specific anchored sample area providing that the QA cursor is 
pointing at the actual sample area.
1. Press the 
SAMPLE SHAPE assignable.
The Sample shape assignable controls are displayed.
2. Adjust the size and angle of the...

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Optimizing the trace display
Optimizing the Y-axis
Auto-scaling
The system can be configured to display the full unit range or a 
range according to the maximum and minimum values of the 
displayed trace(s) (auto-scaling function). In addition, the auto-
scaling function can be set to be live update (updates while the 
sample area is moved) or delayed (updated when the sample 
area is anchored).
Setting the auto-scaling function
1. If...

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Ver tical units
Applicable with 
contrast data only.When analyzing contrast data, the Y-axis can be set to display 
either logarithmic scale (dB) or linear, acoustical units (AU) for 
both tissue intensity (2D) or Angio intensity data.
Selecting the Y-axis unit
1. If necessary, press 
TRACKBALL until the QA trackball 
assignment is selected.
2. Trackball to the Analysis window.
3. Press 
UPDATE MENU in the trackball area on the control...

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The System menu is displayed.
4. Select Smoothing.
The Smoothing menu is displayed.
5. Select a smoothing filter.
The trace display is updated. 

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Switching modes or traces
The user can toggle between TVI, Tissue Tracking, Strain rate 
or Strain modes to access to the mode specific controls (soft 
menu and assignable) or display alternative traces from within 
a selected mode.
To switch mode
1. Press MORE.
2. Select the desired mode (TVI, Tissue Tracking, Strain rate 
or Strain.
The Soft menu and assignables are updated accordingly.
To switch trace
1. If necessary, press TRACKBALL...

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Cur ve fitting analysis
Curve fitting analysis is used to estimate local myocardial 
perfusion rate using ultrasound contrast agents.
The analysis is based on two algorithms:
• Wash-in curve fitting: find and estimate local perfusion 
rate using contrast agent.
Exponential wash-in is described by the function:
y(t)=A[1-e
-kt]+B, where:
• A (dB or AU) is the intensity from the contrast agent.
Note that A+B = 
contrast + tissue = 
plateau...