Stenosis (Stenosis Ratio) - GE Logiq 500 User Manual

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Angle (cont'd)

If a fine adjustment of the 2 cursors is needed, press

Measurement to toggle which line cursor is active. Adjust the

active cursor with the Trackball and Zoom Size/Rotation

Press Set to complete the angle measurement.

% stenosis (stenosis ratio)

To calculate percent stenosis in a B-Mode image:

The area of the blood vessel can be measured by the ellipse,

trace, circle, 2 distance or 1 distance methods. See General

Measurements and Calculations for details on the steps to take

when doing basic distance and area measurements. The Set

Up/Preset Program page 3 defines the default method.

Select % Steno in the Calculations Sub-Menu.

Figure 10–25. Cardiac Calculations Sub-Menu

The first cursor is the residual area of the blood vessel and the

second cursor is the lumen area of the blood vessel.

When using a distance measurement to calculate area for

% stenosis, the measurement should always be taken from a

cross sectional view of the vessel.

Do NOT take a distance measurement from a longitudinal view

for an area calculation. This may lead to an inaccurate

assessment of % stenosis.

500 Basic Users Manual

2233658–100 Rev. 0

Additional Cardiac Calculations