6 - 24 Operator’s Manual
6 Image Acquisition
After adjustment, the LVOT spectrum tracing and calculation results display in real time.
7. Tap [Freeze] button to freeze the image, and check the Smart VTI calculation results.
If necessary, you can edit the LOVT spectrum manually:
a. Select [Edit VTI] to activate the cursor.
b. Move the cursor to the spectrum tracing line.
c. Move the cursor to trace a line.
After tracing, the calculation results display in real time.
8. Select [Save VTI] to save the Smart VTI calculation results of the current cardiac cycle to the
report.
9. Select [Graph] to check the quantitative index trend curve.
VTI, SV, and CO have different trend curves and are differentiated by colors. A maximum of 6
sets of Smart VTI results can be saved and displayed.
10. Tap [Report], and select Volume Management in Report Type to view the report.
For other detailed operations on the report screen, see the Advanced Manual.
6.12 Smart VTI Plus
Smart VTI (Velocity-Time Integral) Plus is used to calculate the cardiac output and afterload of the
LVOT (left ventricular output tract).
Smart VTI Plus supports calculation in real time.
Perform the following procedure:
1. Select a phased probe and Adult Cardiac exam mode.
2. Move the probe to capture an appropriate image of the long axis view of the left ventricular
near the sternum.
3. Tap the [Freeze] button and [Measure] to enter the application measurement. Select the “LVOT
Diam” item and the measurement cursor is displayed.
a. Tap and hold the cursor to move it to the desired position.
b. Tap the cursor to fix the start point.
4. Tap the [Freeze] button to unfreeze the image. Move the probe to capture an appropriate image
of the apical five chamber view.
5. Tap [Smart] > [Smart VTI Plus] to enter the Smart VTI Plus mode.
The system will:
– Automatically trace the PW sampling line and sampling volume.
– Automatically recognize the cardiac cycle: when there are ECG inputs, the ECG signals
are preferred; when there are no ECG signals, the system automatically starts calculation.
– Trace the LVOT spectrum in a cardiac cycle in real time to gain the VTI, HR, and CO
(Cardiac Output) results of the LVOT.
– The real-time data obtained by the X-Link function and calculated by the Smart VTI Plus
to obtain the SVR (Systemic Vascular Resistance) and Eadyn (dynamic arterial elastance)
results of LVOT.
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