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Chapter 5 Measurements and Calculations
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:
%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. Press the %StA button on the touch screen.. “%StA” is displayed 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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