Samsung MYSONO U6 Manual do Utilizador descarregar pdf (Página 191)

5-17

Chapter 5 Measurements and Calculations

Trace

This is a basic measurement that is available in all diagnosis modes. You can measure the circumference

and area of an irregular object in a 2D image.

1. Press Caliper and select Trace under soft menu [2]. ‘Trace’ is shown in the user information area.

2. Use the trackball and the Set button to specify the start point for tracing over the contour of the

measurement area.

X

Use the trackball to place the cursor at the desired position and press the Set button.

3. Trace the curve so that the measurement cursor returns to the start point, and then press the Set

button.

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:

sum

(N = 1,2… last point)

sumArea

%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 to calculate the stenosis ratio (%).

1. Press Caliper and select %StA under soft menu [2]. ‘%StA’ is shown in the user information area.

2. Measure the area of the vessel outer wall using the Area measurement method.

3. When the second cursor appears, measure the area of the vessels inner wall under stenosis.

4. Calculate %StA with the following equation:

%StA = (Outer Area – Inner Area) / Outer Area x 100

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Samsung MYSONO U6 Manual do Utilizador Página 191