Samsung H60 Manual de usuario descargar pdf (Pagina 51)

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Chapter 7 Diagnosis Modes

 PW Spectral Doppler Mode Menu

 Simultaneous

Tap Simultaneous on the touch screen. Each time you tap the button, the Simultaneous function

turns on or off. If the Simultaneous option is turned on, you can view real-time 2D and spectral

Doppler images at the same time. If the option is not turned on, however, you will only be able to

view the image from one of the modes. The Simultaneous function decreases Doppler PRF, thus

decreasing the measurable speed range.

 Invert

Tap Invert on the touch screen. Each time the button is tapped, the speed indicator (+ / –) for a

spectrum is inverted.

 AutoCalc

Tap Auto Calc. on the touch screen to select Off, Live, or Frozen.

If set to Live, the PS, ED, MD, PI, RI, PS/ED, ED/PS, HR, TAMAX, and TAMEAN are calculated after

acquiring the Doppler Trace. If set to Frozen, the PS, ED, MD, PI, RI, PS/ED, ED/PS, HR, TAMAX, and

TAMEAN are calculated when the image is frozen. The values selected in Setup > Measurement

> Parameter1 > Doppler Auto Calculation Items are displayed on screen. For selecting displayed

values, refer to the measurement settings in 'Chapter 3. Utilities’.

CAUTION: The measurements carried out by Auto Trace under Measure and Real Time Automatic

Doppler Trace (Automatic Calculator) may be different from each other. This is because the

algorithms for these two methods are different. It is recommended that you use Auto Trace under

Measure for more accurate measurement.

Tips!

Things to Consider when using 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.

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

results. In addition, during auto calculation, results will not be displayed if the Freeze function is run

against inaccurate values.

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Samsung H60 Manual de usuario Pagina 51