Samsung SONOACE R7 Uživatelský manuál stáhnout pdf (Strana 125)

4-25

Chapter 4 Diagnosis Modes

X Peak Systolic Velocity (PSV) X Time Averaged Mean Velocity (TAM)

X End Diastolic Velocity (EDV) X Diastole / Systole Ratio (D/S)

X Time Averaged Peak Velocity (TAP) X Max Pressure Gradient (PGmax)

X Resistive Index (RI) X Mean Pressure Gradient (PGmean)

X Pulsatility Index (PI) X Velocity Time Integral (VTI)

X Systole / Diastole Ratio (S/D) X PeakA

CAUTION: The measurements done 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 to use Auto Trace under

Measure for more accurate measurement.

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

Use the

Soft Menu

dial-button

[3]

. You can select the part of spectrum to use AutoCalc from Up, Down,

or All.



Simultaneous

Each time you press the

Soft Menu

dial-button

[4]

, the Simultaneous function turns on and o.

NOTE: It appears in the PW menu only when “Utility > Setup > General > Simultaneous Mode”

is set to Allow.

If the Simultaneous function is enabled, you can view the 2D image and Spectral Doppler image

simultaneously in real time. If it is disabled, you can view only one of the two images.

The Simultaneous function decreases Doppler PRF, thus decreasing the measurable speed range.

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 319 320

Komentáře k této Příručce

Žádné komentáře

Samsung SONOACE R7 Uživatelský manuál Strana 125

Komentáře k této Příručce

Související produkty a manuály pro Měření, testování a kontrola Samsung SONOACE R7