GE Vivid S70, User Manual

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4D-Mode
Vivid S70 / S60
–
User Manual
6-17
BC092760-1EN 01
Real time multi beat 4D Color Flow acquisition
Real time gated 4D Color Flow acquisition is based on ECG
gated sub-volume acquisitions of color flow data.
1. Connect the ECG device and make sure to obtain a stable
ECG trace.
2. Select a 4D probe and a cardiac application.
3. While in 2D, press
Color .
4. Use the trackball to adjust the position and size of the color
ROI as necessary. Alternatively, perform this step in Biplane
where it's possible to adjust the position and the size on
both azimuth and elevation plane.
5. Press 4D on the Control panel.
6. You may adjust Num Beats to change the number of heart
beats the acquisition should be based on.
7. On the touch panel, press Multi beat . The gated acquisition
is started. Ask the patient to hold her/his breath at end
expiration. Keep the probe steady and look for stitching
artifacts in the color flow data in both the volume rendering
and the elevation plane in the lower left window of the
screen.
8. Press Freeze .
In 2D Freeze, look for stitching artifacts in the color flow data
in both the volume rendering and the elevation plane in the
lower left window of the screen.
CAUTION
ECG gated acquisition may by nature contain artifacts. The
triggering works by acquiring the whole tissue volume during
the first heart beat, followed by several color sub-volumes that
are stitched together. Consequently, the tissue volume is not
updated for every heart beat, and only the color data may have
stitching artifacts.
Artifacts may be caused by:
• Movements of the probe caused by the operator during
acquisition.
• Movements of the patient during acquisition, including
movements caused by respiration.
• Irregular heart rate during acquisition.
To validate the acquisition, perform a visual inspection in both
the volume rendering and the elevation plane. Stitching
artifacts are shown as visible transitions between the
sub-volumes in the color flow data. The Multi-Slice mode is
also well suited for evaluating the presence of stitching artifacts
while in live acquisition (see Figure 6-5).