
5-16
Operation Manual
NOTE:
Trace lines must be closed. If you press the Set button before tracing is complete, tracing may be
done over a straight line between the current point and the start point, resulting in a significant error.
4. When the measurement is nished, its result is shown on the screen.
The equations used for Trace measurement are as follows:
, (N = 1,2… last point)
, (N = 1,2… last point)
%StA
StA stands for Stenosis Area, which is a basic measurement available in all diagnosis modes. In a 2D image,
the area of a vessel is measured and the stenosis ratio (%) calculated.
1. Select %StA in the Soft Menu [2]. %StA will appear in the user information area.
2. Measure the area of the vessel outer wall using the Area measurement method.
3. When a new cursor appears, measure the inner wall area of the vessel under stenosis.
4. Calculate %StA with the following equation:
%StA = (Outer Area – Inner Area) / Outer Area × 100
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