Samsung MYSONO U6 Manual do Utilizador descarregar pdf (Página 135)

4-27

Chapter 4 Diagnosis Modes

Tips!

Things to Consider for Real Time Automatic Doppler Trace

1. Aliasing occurs because PRF is too low in comparison to the image speed, or the spectrum is

clustered around the baseline because PRF is too high.

2. Peak is indistinctive or intermittent such as in Spectral waveforms for veins.

3. Meaningful spectrum distinction becomes diﬃcult because Doppler Gain is set too high or too

low.

4. An index is displayed during the transition time after Sample Volume is moved with the Trackball.

5. The major spectral signals are cut oﬀ because Doppler Wall Filter is set too high.

6. Peak Trace is interrupted due to abnormal Doppler noise or artifacts. Heart rate is above

approximately 140 bpm.

If any of the above apply, Real Time Automatic Doppler Trace may not produce an accurate trace or

results. Furthermore, during auto calculation, results will not be displayed if the Freeze function is

run against inaccurate values.

 Baseline

Use the [5] dial button on the soft menu. Rotate the dial-button and adjust the position of the

Doppler image’s horizontal axis.

 Mean Trace

NOTE: Appears in the soft menu when AutoCalc is turned on.

Performs a Doppler trace and displays the mean value. Press the soft menu’s dial-button [5] to turn

on or o.

 Display Format

Used to congure 2D image and PW image layout. Rotate the soft menu’s dial-button [1] and

choose one.

 Doppler Average

Press the soft menu’s dial-button [2] to turn on or o. Once turned on, you can use FDRP (Fast DRP)

to increase the quality of Spectral Doppler image.

 Spectrum Ehn

Used to adjust Spectral Doppler image brightness and sensitivity levels. Set to a value between 1

and 4 by rotating the [3] dial button beneath the soft menu. Spectrum Ehn is short for spectrum

enhancement.

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Samsung MYSONO U6 Manual do Utilizador Página 135