Samsung ACCUVIX XG Manuel d'utilisateur télécharger pdf (Page 143)

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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 artifact, and the heart rate is above

approximately 140 bpm.

The trace and/or results of Real Time Automatic Doppler Trace may not be accurate in the above

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

is run against inaccurate values.

■

AutoCalc Direction

Tap AutoCalc Direction on the touch screen. Select the part of spectrum to use AutoCalc from All,

Up or Down.

■

TDW (Tissue Doppler Wave Mode)

Tap TDW on the touch screen. The system will switch to TDW Mode.

NOTE:

X

This option is available only when the cardiac application is selected for a Phased Array probe.

X

For information on TDW, please refer to “Tissue Doppler Wave Mode.”

■

Spectrum Enhancement

Tap Spectrum Ehn. on the touch screen. This function controls brightness and sensitivity of Spectral

Doppler images. You can select a value between 1-4.

■

Spectrum Type

Tap Spectrum Type on the touch screen. Select the spectrum type from Type 1 – 3.

NOTE: Description for touch screen menu items is the same as for Color Doppler Mode.

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Samsung ACCUVIX XG Manuel d'utilisateur Page 143