GE Vivid 7 User Manual

Contrast Imaging
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MC Contrast controls
MC Contrast assignables controls
Horizontal sweep
Adjust the refresh rate of the ECG.
ECG Trig 1
Specifies the delay (ms) from R-wave to the triggered frame.
ECG Trig 2
Specifies the delay (ms) from R-wave to the second frame. Tr i g  
2 must be greater than Tr i g 1 for dual triggering to be active.
ECG Trig Interval
Controls the number of cardiac cycles between triggered 
images.
Simultaneous
Enables simultaneous...

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MC Contrast Soft menu controls (2D Angio mode)
Power
Controls the amount of acoustic power applied to the 
transmitted pulse.
Color threshold
Too high a Power 
level will destroy 
the contrast agent.Controls the level of greyscale intensity that is used as a 
threshold for color overlay.
PRF (Pulse Repetition Frequency)
Adjusts the repetition rate of the Doppler pulses transmitted to 
acquire the data for color mapping.
Lower frame rates...

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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 is adjusted by rolling the trackball. 

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Running MC Contrast
The MC Contrast application works only with the M3S, 3S and 
5S probes.
To select MC Con-
trast application 
without changing 
the current probe, 
press 
APPL. on the 
control panel.
1. Press PROBE on the control panel.
A list of the connected probes is displayed.
2. Trackball to the desired probe supporting the MC Contrast 
application.
The Application menu for the selected probe is listed.
3. Trackball to LV Contrast...

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See also page 62 
about cineloop oper-
ation.21. Select Left marker and Right marker frames to define the 
cineloop to transfer.
22. Press 
IMAGE STORE to save the contrast acquisition.
Optimizing MC Contrast
•  A good baseline image is the key for successful myocardial 
contrast imaging. Using Coded Harmonic Angio, no colors 
should be found in the myocardium at baseline.
•  The ECG triggering position should be adjusted to avoid 
wall...

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Real-Time Myocardial Contrast Imaging
Real-Time Myocardial Contrast (RTMC) is intended for 
visualization of myocardial perfusion by use of ultrasound 
contrast agents. As opposed to MC Contrast, RTMC performs 
myocardial contrast imaging in a non-triggered mode.
WARNINGThis application is intended for clinical research only. Diagnosis 
must not be based on results achieved by contrast analysis 
alone. 

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RTMC over view
 Figure 5-5: The RTMC Contrast acquisition screen
1. Sample volume
2. Status window:
3. Soft menu
Controls marked with R 
are also available in 
freeze and cine replay. 

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 Figure 5-6: The RTMC controls on the front panel
1. Application
2. Probe
3. Gain R
4. Assignable keys:
• Frequency
• Focus
• Flash
• Flash frames
• Flash gain
• Simultaneous
• Angio
• Color maps R
• Cineloop (in Freeze)
• Flash power
• 2D width
• ECG trig
5. Soft menu
• Power
• Frame rate
• Color threshold
• PRF
• Low velocity reject
• Sample volume
• Radial average
• Lateral average
• DDP R
• 
6. Trackball
Controls marked with R are 
also...

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RTMC controls
RTMC Contrast assignables controls
Frequency
Enables the adjustment of the probes operating frequency. A 
higher frequency gives better resolution.
Focus
Changes the location of the focal point. A triangular marker on 
the depth scale along the image sector indicates the position of 
the focal point.
Flash
Enables the transmission of a pulse with the maximum allowed 
power over a given time. The purpose of the Flash function is...

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Flash power
Controls the power (amplitude) of the Flash. The maximum 
allowed power is default.
RTMC Soft menu controls
Power
Controls the amount of acoustic power applied to the 
transmitted pulse.
Too high a Power 
level will destroy 
the contrast agent.Color threshold
Controls the level of greyscale intensity that is used as a 
threshold for color overlay.
PRF (Pulse Repetition Frequency)
Adjusts the repetition rate of the Doppler pulses...