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. Trackball to the sample area to delete.
3. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
4. Trackball to Delete trace.
5. Press 
SELECT to perform deletion. 
						

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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 frame marker turns red.
disabling successive frames at a time
To re-enable succes-
sive frames: press 
and hold down 
the 
SELECT key 
while dragging the 
cursor over the 
frame markers.
1. Press and hold down SELECT while dragging the cursor 
over the frame markers of the frames to disable.
The frame markers turn red.
ECG triggered frame disabling
In a multi-cycle acquisition, the user may deselect all frames in 
all heart cycles but a selected one. This function can be used 
for example to select a particular systolic frame for each heart 
cycle.
1. Scroll through the cineloop to identify the cardiac phase to 
analyze or identify the cardiac phase on the ECG trace.
2. Trackball to the frame marker of the frame of interest in one 
of the heart cycles (see Figure 7-2).
3.Press 
UPDATE MENU.
The System menu is displayed.
4. Trackball to ECG triggering.
5. Press 
SELECT.
All frames in all heart cycles are disabled except for the 
selected and corresponding frames in the other heart 
cycles.
Disabling frames in the cineloop 
windows
1. Press UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
2. Trackball to Disable frame. 
						

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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 axis
3. Enabled frame 
(green marker)
4. Disabled frame (red 
marker)
5. ECG
6. Current frame 
						

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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 control 
panel.
The System menu is displayed.
4. Trackball to Set Sample area shape.
5. Press 
SELECT.
A Dialogue window is displayed where the user can adjust 
the height, the width and the angle of the sample area (see 
Figure 7-3).
 Figure 7-3: The sample area reshaping window
6.Drag the sliders to adjust the shape of the sample area as 
desired.
7. Press OK to return to the Quantitative analysis window and 
use the settings for the current analysis only.
OR 
						

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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 sample area using the 
assignable rotaries.
3. If desired press the assignable 
SET DEFAULT to keep the 
settings as default.
Labelling a sample area
The sample area label is used to identify data associated to the 
sample area when exporting to a spreadsheet program.
1. If necessary, press 
TRACKBALL until the QA trackball 
assignment is selected.
2. Trackball to the sample area to label.
3. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
4. Trackball to Label Sample area....
5. Press 
SELECT.
A Dialogue window with a free text field is displayed (see 
Figure 7-4).
6.Ty p e a name for the sample area.
7. Press OK to return to the Quantitative analysis screen.
 Figure 7-4: The sample area labelling window
1. Free text 
						

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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 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 
panel.
The System menu is displayed.
4. Trackball to Vertical auto-scaling.
5. Press 
SELECT.
The Vertical autoscaling menu is displayed.
 Figure 7-5: The Vertical Auto-scaling menu
6. Trackball to the desired option:
• Delayed: autoscaling takes place after anchoring the 
sample area.
• On: autoscaling while moving the sample area.
• Off: displays full scale.
7. Press 
SELECT. 
						

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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 
panel.
The System menu is displayed.
4. Trackball to Vertical unit.
5. Press 
SELECT.
The Vertical unit menu is displayed.
 Figure 7-6: The Vertical unit menu
6. Trackball to the desired option.
7. Press 
SELECT.
Trace smoothing
The system can smooth the traces displayed by applying a filter 
over a defined time window. The type of filter available is 
depending on the analysis signal displayed.
Smoothing trace(s)
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 
panel. 
						

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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 until the QA trackball 
assignment is selected.
2. Trackball to the Analysis window.
3. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
4. Trackball to Analysis signal.
5. Press 
SELECT.
The Analysis signal menu is displayed.
 Figure 7-7: The Analysis signal menu
6. Trackball to the desired trace.
7. Press 
SELECT.
The Analysis window is updated with the selected trace. 
						

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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 level.• B (dB or AU) is the intensity at time t = 0 (defined as the 
time of left marker). This corresponds to the tissue 
(baseline) signal if no contrast is present at the selected 
starting point.
• k (1/s) is a time constant.
• Wash-out curve fitting: find and estimate the wash-out 
rate of contrast agent locally (e.g. LV or myocardium).
Exponential wash-out is described by the function:
y(t)=Ae
-kt+B, where:
• A (dB or AU) is the intensity from the contrast agent.
Note that A+B is 
the initial intensity 
level.• B (dB or AU) is the intensity from the tissue = baseline 
signal.
• k (1/s) is a time constant.