GE Vivid 7 User Manual

Scanning Modes
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Tissue Tracking controls
Tissue Tracking assignable controls
Tracking start
The time after ECG R-peak when the integration should start.
Tracking end
The time after tracking start when the integration should end.
Tracking scale
Controls the color cut-off value of max displacement displayed. 
The chosen values is shown on the color bar when the 
assignable is activated.
Invert
Enables the color scheme assigned to positive and negative 
tissue...

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•  Tissue Tracking (see page 125)
•  Strain rate (see page 130)
• Strain (see page 136)
Tissue Tracking Soft menu controls
Frame rate
Controls the line density. When adjusting frame rate, there is a 
trade off between spatial and temporal resolution.
Transparency
Controls the degree of transparency of the Tissue Tracking 
color.
Threshold
Controls the level of greyscale intensity that is used as a 
threshold for color.
Frequency
Enables the...

Scanning Modes
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Using Tissue Tracking
1. From TVI Mode, press  ALT on the control panel and press 
the 
TISSUE TRACKING assignable.
2. Adjust 
TRACKING START (assignable) close to the R-peak.
3. Adjust 
TRACKING END (assignable) near the T-wave.
Optimizing Tissue Tracking
•  To reduce quantification noise (variance), the Nyquist limit 
should be as low as possible, without creating aliasing. To 
reduce the Nyquist limit, reduce the scale while in TVI.
•  To...

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Strain rate
Strain rate over view
 Figure 3-14: The Strain rate mode screen
1. Color sector marker
2. Status window
3. Soft menu
4. Strain sample size
Controls marked with R 
are also available in 
freeze and cine replay.
  

Scanning Modes
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 Figure 3-15: The Strain rate mode controls on the front panel
Strain rate calculates and color-codes the deformation per unit 
time i.e the speed at which the tissue deformation occurs.
Strain rate is defined as the spatial gradient of velocity data.
1. Assignable keys:
• 2D width
• SRI scale R
• Invert R
• Simultaneous R
• Color maps R
• Q-Analysis (Freeze 
only)
• Cineloop (Freeze 
only)
ALT
• Curved AMM R
• AMM R
• Tissue Tracking R
•...

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Strain rate controls
Strain rate assignable controls
2D width
Controls the angular width of the 2D image sector.
SRI scale
Defines the scale for the color coding of the strain rate.
Invert
Enables the color scheme assigned to strain rate to be 
inverted. Invert is available in live and cine replay.
Simultaneous
Enables simultaneous display of 2D image and 2D image with 
Strain rate color.
Color maps
Displays a menu of color map options. Use the...

Scanning Modes
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Strain rate Soft menu controls
Frame rate
Controls the line density. When adjusting frame rate, there is a 
trade off between spatial and temporal resolution.
Strain length
Determines the strain sample volume size.
SRI Reject
Adjust the cut-off level of the low tissue velocity to be discarded 
when generating the color image. Rejected values are 
displayed in green.
Compress
Controls the amount of color compression. The color bar is 
adjusted...

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Cine Compound (Freeze only)
Calculates and displays cineloops generated from a temporal 
averaging of multiple consecutive heart cycles. The number of 
cycles averaged is controlled from the Soft menu rocker. The 
number of averaged cycles i displayed on the top left corner. 

Scanning Modes
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Using Strain rate
1. From TVI Mode, press  ALT on the control panel and press  
STRAIN RATE.
Optimizing Strain rate
•  To reduce quantification noise (variance), the Nyquist limit 
should be as low as possible, without creating aliasing. To 
reduce the Nyquist limit, reduce the scale while in TVI.
•  To check for aliasing, freeze the loop and apply velocity 
trace (Press 
FREEZE and Q-ANALYSIS), see also Chapter 7, 
’Quantitative Analysis’ on...

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Strain
Strain over view
 Figure 3-16: The Strain mode screen
1. Color sector marker
2. Strain color bar
3. Status window
4. Soft menu
5. Strain start and end 
markers
6. Strain start and end 
from R-peak and 
Strain sample size
Controls marked with R 
are also available in 
freeze and cine replay.