Samsung MYSONO U6 Manual de usuario Pagina 200

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Operation Manual
Tips!
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
X
If Gain is changed for a Doppler image in the Freeze state, Contour Trace and Peak Trace will not
work.
X
If there is little or no noise in an image without a spectrum, Contour Trace will not work.
X
If there is severe noise in an image, Contour Trace will not work.
X
If the Clutter filter is set too high, Auto Trace or Limited Trace may not work.
Causes for Inaccurate Peak Trace
X
If PRF (Pulse Repetition Frequency) is lower than the velocity in the observation area, aliasing
may occur. If the original signals are separated from any aliasing, the Trace can be carried out,
but the peak measurement may not be accurate.
X
If the peak of a spectral waveform is not clear or occurs intermittently, the Trace can be carried
out, but the peak measurement may not be accurate.
X
If the doppler gain is set to high or low, it becomes difficult to distinguish spectrums. This may
result in measurement error(s).
X
If the Wall Filter is set too high, only part of the spectrum is displayed. In this case, the Trace can
be carried out, but Peak measurement may not be accurate.
X
If abnormal noise or artifacts occurs, the Trace can be carried out but Peak measurement may
not be accurate.
Other
X
Use of the CW Probe may result in measurement error(s).
X
Limited Trace is supported only for two-peak spectrums such as Mitral Valve Inflow and Tricuspid
Valve Inflow in the cardiology application.
Limited Trace
If you specify a measurement range, a spectrum is traced automatically. This function is enabled in
the menu in Spectral Doppler Mode.
1. Select Limited Trace in the measurement menu. A bar appears allowing you to specify a
measurement area.
2. Specify the measurement range.
X Place the bar at the desired position with the trackball, and press the Set button.
3. The system traces spectrums within the specied range automatically.
4. When Trace is complete, the measurement results are displayed on the screen.
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