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Chapter 5 Measurements and Calculations
% StD
Measure the diameter of a blood vessel. StD stands for Stenosis Distance.
1. Select the %StD menu and the rst cursor will appear in 2D Mode.
2. Measure the total diameter of a vessel using the Distance measurement method.
3. When a new cursor appears, measure the inner wall diameter of the vessel that is under stenosis.
%StD = (Outer Distance – Inner Distance) / Outer Distance x 100
Heart Rate Measurement
HR(Heart Rate)
You can calculate heart rates over a certain period of time.
1. Select HR in the measurement menu. A bar appears allowing you to specify a measurement area.
2. Specify the measurement range.
X Place the bar at a desired position with the trackball, and press the Set button.
3. The system measures the heart rate within the specied range automatically.
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