Samsung MySono U5 Manual do Utilizador Página 187

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Chapter 5 Measurements and Calculations
5-27
Stenosis Measurement
You can measure the stenosis of each blood vessel system by measuring and calculating an area or
distance.
%StA
Measure the area of the inner and outer walls of a blood vessel. StA stands for Stenosis Area.
1. Select the %StA menu, and the rst cursor appears in 2D Mode.
2. Measure the area of the vessel outer wall using the Circ/Area measurement method.
3. When the second cursor appears, measure the inner wall area of the vessel under stenosis.
%StA = (Outer Area – Inner Area) / Outer Area × 100
%StD
Measure the diameter of a blood vessel. StD stands for Stenosis Distance.
1. Select the %StD menu, and the rst cursor appears 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 under stenosis.
%StD = (Outer Distance – Inner Distance) / Outer Distance × 100
Heart Rate Measurement
HR (Heart Rate)
You can calculate heart rate for 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 area.
X Place the bar at a desired position with the trackball, and press the Set button.
3. The system automatically measures the heart rate within the specied range. The measurement
results are displayed on the screen.
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