Chapter 7 - Working With Measurements
Measuring in the 2D Window
Terason t3000 / Echo Ultrasound System User Guide
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Trace Measurement on an Image
Calculating Percent Stenosis
If the 2D scan shows stenosis, you can measure the percent diameter or area stenosis
depending on the protocol in use.
To calculate the percentage, you must make two measurements: the full area or diameter
of the vessel and the residual lumen. When you complete the second measurement, the
Terason software calculates the percent of the area or diameter stenosis.
You can make these measurements in any order; the Terason software always uses the
largest measurement as the diameter or area of the vessel.
This procedure shows you how to measure the percentage of stenosis based on the
diameter:
1.
Click Freeze
. If playing a loop, click Pause
. The measure tabs for the
selected scan mode are added to the Image Control window.
2.
If necessary, click the
2D Measure
tab or click in the 2D window.
3.
Select
Stenosis Diameter
from the Measurement menu.
4.
Click at the start and end points of the
vessel
.
The Terason software calculates the length of the line and displays the Diameter value.
5.
Click at the start and end points of the
residual lumen
. The Terason software displays
the second Diameter value and calculates the percentage stenosis.
