Samsung SONOACE X6 Manual do Utilizador descarregar pdf (Página 22)

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Common Measurement Methods

This section provides information on the common measurement methods used for applications.

▐ Measurements in Spectral Doppler Mode

In general, if you trace a Doppler spectrum, you can obtain results for various measurement

items automatically. There are 3 ways to trace a Doppler spectrum.

SONOACE X6 also allows you to select a specific item under the Measurement menu and

take measurements individually without tracing a Doppler spectrum.

 Auto Trace

A spectrum is traced automatically. It is enabled in the Measurement menu in Spectral

Doppler Mode.

1. Press Auto Trace in the Measurement menu.

2. The system traces a spectrum automatically.

3. When Trace is complete, the measurement results are displayed on the screen.

※

Things to consider for Doppler Spectrum Auto Trace

The state of a Doppler spectrum may affect measurement results. Please see the following:

Causes for Trace Failure

- If Gain is changed for a Doppler image in the Freeze state, Contour Trace and Peak

Trace will not work.

- If there is little or no noise in an image without a spectrum, Contour Trace will not work.

- If there is severe noise in an image, Contour Trace will not work.

- If the Clutter filter is set too high, Auto Trace or Limited Trace may not work.

Causes for Inaccurate Peak Trace

- If PRF (Pulse Repetition Frequency) is lower than the velocity of the observation

area, aliasing may occur. If the original signals are separated from aliasing, Trace can

be done but the peak measurement may not be accurate.

- If the peak of a spectral waveform is not clear or occurs intermittently, Trace can be

done but the peak measurement may not be accurate.

- If the Doppler Gain is set to high or low, it becomes difficult to distinguish spectrums.

This may result in measurement error(s).

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Samsung SONOACE X6 Manual do Utilizador Página 22