Samsung SONOACE R3 Bedienungsanleitung PDF herunterladen (Seite 147)

Chapter 5 Measurements and Calculations

5-23

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 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.

X

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.

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, Trace can be

done but Peak measurement may not be accurate.

X

If abnormal noise or artifact occurs, Trace can be done but Peak measurement may not be

accurate.

Misc.

X

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

Valve Inflow in the cardiology application.

Volume Flow Measurement

Select Volume Flow in the Measurement menu.

Volume Flow allows you to measure and calculate an area or distance. For information on distance or area

measurements, please refer to “Basic Measurements.” The TAMV (Time Avg. Mean Velocity) value is auto-

matically measured.



■

Vesl. Area (Vessel Area)

Measure the area of a blood vessel and calculate TAMV and Volume Flow.

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