Samsung SONOACE R7 Uživatelský manuál stáhnout pdf (Strana 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.

Select the

Soft Menu

[2]

Trace. “Trace”

is displayed in the user information area.

Use the

Trackball

and the

Set

button on the control panel to specify the start point for tracing over the

contour of the measurement area.

X Place the cursor at a desired position with the

Trackball

, and press the

Set

button.

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.

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 and the stenosis ratio (%) calculated.

Sele

ct %StA in th

Soft Menu

[2]

%StA will ap

pear in the user information area.

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

When a new cursor appears, measure the inner wall area of the vessel under stenosis.

Calculate %StA with the following equation:

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

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