Image Optimization 5-27
5. Tap [Volume Flow] again and repeat step 4 to measure the 2nd and 3rd volume flow measurement.
Press <Update> to switch the volume flow results.
6.
Set the range for VF and VF’ measurement.
Press <Cursor> to see the indication area switch to
status.
Roll the trackball to review the cine. Tap [VF] to set the starting point for measurement and [VF’] to
set end point.Due to different range of the measurement, result of the volume flow may be slightly
different.
7. Press <Save> to save the cine file.
Delete a volume flow result
After 3 results are acquired, you can delete the result by pressing <Update> to activate it and press
<Clear>.
5.6.6
WSS (Wall Shear Stress)
1. Capture image as described in step 1-
5 in chapter “5.6.1 V Flow Basic Operations”.
2. Roll the trackball to replay the cine and select a target frame.Press <Cursor> to see the indication
area switch to
status.
3. Tap [WSS] to see a green ellipse on the image.
4. Roll the trackball to drag the first green ellipse onto the vessel wall and press <Set>. The ellipse is
anchored and another dotted line and dot appear.
Move the green solid line to drag the dotted line along the vessel wall and press <Set> to anchor the
position and orientation of stress point. WSS result window displays maximum and average shear
stress of the location and stress curve displays under the image (X-axis is time and Y-axis is shear
stress.)
