Samsung HS50 Bedienungsanleitung PDF herunterladen (Seite 165)

8-21

Chapter 8 Measurements and Calculations

 Auto Trace

Spectrum is traced automatically. This can be enabled in the measurement menu in Spectral

Doppler mode.

1. Press Auto Trace in the Measurement menu.

2. The system traces the spectrum automatically.

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

Tips!

Things to Consider when using Doppler Spectrum Auto Trace

The state of a Doppler Spectrum may aﬀect the measurement results. Please pay attention to the

following:

X

Causes for Trace Failure

− If the Gain is changed while a Doppler image is in 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 and Limited Trace may not work.

X

Possible Causes of Inaccurate Peak Trace

− If the PRF (Pulse Repetition Frequency) is lower than the velocity at the site being examined,

aliasing may occur. If the original signals are separated from aliasing, a Trace can be carried

out, but the peak measurement may not be accurate.

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

out, but the peak measurement may not be accurate.

− If the Doppler Gain is set too high or too low, it becomes diﬃcult to distinguish spectra. This

may result in measurement error.

− If the Wall Filter is set too high, the spectrum will only be partially displayed. In this case, a

Trace can be carried out, but Peak measurement may not be accurate.

− If abnormal noise or artifacts occurs, a Trace can be carried out, but Peak measurement may

not be accurate.

X

Other

− Use of the CW Probe may result in measurement error(s).

− Limited Trace is supported only for two-peak spectrums, such as Mitral Valve Inﬂow and

Tricuspid Valve Inﬂow in the cardiology application.

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OSCAR 23 Apr 2025 | 08:21:36

Samsung HS50 Bedienungsanleitung Seite 165