Samsung SA8000 SE Manual do Utilizador descarregar pdf (Página 17)

Chapter 5.Measurements and Calculations 5 - 17

Setting, errors in the measurement results could occur.

- When the spectrum signals are interrupted due to too high a Doppler Wall Filter

setting, Contour trace is possible, but Peak Trace may not be accurate.

- When Peak Trace is interrupted due to abnormal Doppler noise or artifact, Contour

trace is possible, but Peak Trace may not be accurate.

- When PW Gain is changed on a frozen image, Contour Trace/Peak Trace may not

work properly. To activate Auto Trace, the PW Gain of the frozen image should

maintain the same value on the one screen display.

- If noise is weak or absent in the image without spectrums, Contour Trace is not

activated. In the case of excessive noise, the result may not be accurate.

- If the Clutter filter is used too much, Auto Trace/ Limited Trace may not be

activated.

 Limited Trace: Calculates Doppler Spectrum Cycle of the Designated Range

– When Control Threshold is set as ‘Enable’, in the ‘Setting Measurements’,

1. Press the Calculator button on the control panel after obtaining a specific

image.

2. Select Limited Trace in the measurement menu, and the baseline appears on

the spectral waveform.

3. Use the Trackball to position the baseline on the start point of the area to

measure, and press the Set button.

4. When another baseline appears, position it on the end point of the area and

press Set button again to complete Limited Trace.

5. Press Change button to change the trace direction. The trace direction can

only be changed before the second baseline is set. The trace direction can be

set for All, Above, or Below. Select one of them using the baseline as a

standard. The selected value is displayed at the top of the screen. The trace

direction can be set in the ‘Setting Measurements’ and saved as default.

6. To change the threshold trace, rotate the Menu dial-button to the left or right.

The tracing starts again, and a new trace line is drawn.

7. Press Menu dial-button or Set button to complete Limited Trace.

8. The values such as PSV, EDV, TAM, Vmean, Gmean, Gpeak, S/D, PI, and RI

are measured and displayed on the screen.

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Samsung SA8000 SE Manual do Utilizador Página 17