Measurement and Analysis
306 Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
the right, at a pre-defined offset distance. The length of the
ROI box is a fixed length.
11. Move the ROI box up or down to cover the posterior wall of
the carotid vessel.
Press
SET to anchor the point. For the posterior wall the
contour detector searches for the leading edges of the
intima and adventitia layers. The detected contours are
drawn in the image (Figure 7-36, right).
The measurement calculations are displayed in the
Measurement result Table.
Note: if the Intima and Media layers are not within the
search region, the contour is not drawn. Select (double
click) and move the anchored points closer to the Intima
layer.
Figure 7-36: IMT Measurement segment and traces
12. If the contour is not optimal, the following assigned control
may be adjusted to improve border detection:
•
TRACE FIT: the traces are modified according to different
threshold values.
If the contour is still not optimal, try to perform the IMT
measurement on another frame, preferably close to the
end diastole.
IMT Measurement Protocol setting
When the IMT Protocol soft-button is turned ON two special
controls will appear: "Offset" and "Length", controlling the IMT
ROI with predefined length and predefined distance (offset)
from the vertical marker.
1. Measurement segment 2. IMT trace
To Next Page
Loading...
